tests/test_other.py

# coding=utf-8
# Copyright 2013 The Emscripten Authors.  All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License.  Both these licenses can be
# found in the LICENSE file.

# noqa: E241

from __future__ import print_function
from functools import wraps
import filecmp
import glob
import itertools
import json
import os
import pipes
import re
import select
import shlex
import shutil
import struct
import subprocess
import sys
import time
import tempfile
import unittest
import uuid

if __name__ == '__main__':
  raise Exception('do not run this file directly; do something like: tests/runner.py other')

from tools.shared import Building, PIPE, run_js, run_process, STDOUT, try_delete, listify
from tools.shared import EMCC, EMXX, EMAR, EMRANLIB, PYTHON, FILE_PACKAGER, WINDOWS, LLVM_ROOT, EMCONFIG, EM_BUILD_VERBOSE
from tools.shared import CLANG, CLANG_CC, CLANG_CPP, LLVM_AR
from tools.shared import NODE_JS, SPIDERMONKEY_ENGINE, JS_ENGINES, V8_ENGINE
from tools.shared import WebAssembly
from runner import RunnerCore, path_from_root, no_wasm_backend, no_fastcomp, is_slow_test
from runner import needs_dlfcn, env_modify, no_windows, chdir, with_env_modify, create_test_file, parameterized
from tools import jsrun, shared
import tools.line_endings
import tools.js_optimizer
import tools.tempfiles
import tools.duplicate_function_eliminator

scons_path = Building.which('scons')


class temp_directory(object):
  def __init__(self, dirname):
    self.dir = dirname

  def __enter__(self):
    self.directory = tempfile.mkdtemp(prefix='emtest_temp_', dir=self.dir)
    self.prev_cwd = os.getcwd()
    os.chdir(self.directory)
    print('temp_directory: ' + self.directory)
    return self.directory

  def __exit__(self, type, value, traceback):
    os.chdir(self.prev_cwd)


def uses_canonical_tmp(func):
  """Decorator that signals the use of the canonical temp by a test method.

  This decorator takes care of cleaning the directory after the
  test to satisfy the leak detector.
  """
  @wraps(func)
  def decorated(self):
    # Before running the test completely remove the canonical_tmp
    if os.path.exists(self.canonical_temp_dir):
      shutil.rmtree(self.canonical_temp_dir)
    try:
      func(self)
    finally:
      # Make sure the test isn't lying about the fact that it uses
      # canonical_tmp
      self.assertTrue(os.path.exists(self.canonical_temp_dir))
      # Remove the temp dir in a try-finally, as otherwise if the
      # test fails we would not clean it up, and if leak detection
      # is set we will show that error instead of the actual one.
      shutil.rmtree(self.canonical_temp_dir)

  return decorated


def is_python3_version_supported():
  """Retuns True if the installed python3 version is supported by emscripten.

  Note: Emscripten requires python3.5 or above since python3.4 and below do not
  support circular dependencies."""
  try:
    print('is_python3_version_supported')
    python3 = Building.which('python3')
    print('  python3 =', python3)
    output = run_process([python3, '--version'], stdout=PIPE).stdout
    print('  output =', output, output.split())
    output = output.split()[1]
    # ignore final component which can contains non-integers (e.g 'rc1')
    version = [int(x) for x in output.split('.')[:2]]
    return version >= [3, 5]
  except Exception:
    # If anything goes wrong (no python3, unexpected output format), then we do
    # not support this python3
    return False


def encode_leb(number):
  # TODO(sbc): handle larger numbers
  assert(number < 255)
  # pack the integer then take only the first (little end) byte
  return struct.pack('<i', number)[:1]


def get_fastcomp_src_dir():
  """Locate fastcomp source tree by searching realtive to LLVM_ROOT."""
  d = LLVM_ROOT
  key_file = 'readme-emscripten-fastcomp.txt'
  while d != os.path.dirname(d):
    d = os.path.abspath(d)
    # when the build directory lives below the source directory
    if os.path.exists(os.path.join(d, key_file)):
      return d
    # when the build directory lives alongside the source directory
    elif os.path.exists(os.path.join(d, 'src', key_file)):
      return os.path.join(d, 'src')
    else:
      d = os.path.dirname(d)
  return None


def parse_wasm(filename):
  wast = run_process([os.path.join(Building.get_binaryen_bin(), 'wasm-dis'), filename], stdout=PIPE).stdout
  imports = []
  exports = []
  funcs = []
  for line in wast.splitlines():
    line = line.strip()
    if line.startswith('(import '):
      line = line.strip('()')
      name = line.split()[2].strip('"')
      imports.append(name)
    if line.startswith('(export '):
      line = line.strip('()')
      name = line.split()[1].strip('"')
      exports.append(name)
    if line.startswith('(func '):
      line = line.strip('()')
      name = line.split()[1].strip('"')
      funcs.append(name)
  return imports, exports, funcs


class other(RunnerCore):
  # Utility to run a simple test in this suite. This receives a directory which
  # should contain a test.cpp and test.out files, compiles the cpp, and runs it
  # to verify the output, with optional compile and run arguments.
  # TODO: use in more places
  def do_other_test(self, dirname, emcc_args=[], run_args=[]):
    shutil.copyfile(path_from_root('tests', dirname, 'test.cpp'), 'test.cpp')
    run_process([PYTHON, EMCC, 'test.cpp'] + emcc_args)
    expected = open(path_from_root('tests', dirname, 'test.out')).read()
    seen = run_js('a.out.js', args=run_args, stderr=PIPE, full_output=True) + '\n'
    self.assertContained(expected, seen)

  # Another utility to run a test in this suite. This receives a source file
  # to compile, with optional compiler and execution flags.
  # Output can be checked by seeing if literals are contained, and that a list
  # of regexes match. The return code can also be checked.
  def do_smart_test(self, source, literals=[], regexes=[],
                    emcc_args=[], run_args=[], assert_returncode=0):
    run_process([PYTHON, EMCC, source] + emcc_args)
    seen = run_js('a.out.js', args=run_args, stderr=PIPE, full_output=True,
                  assert_returncode=assert_returncode) + '\n'

    for literal in literals:
      self.assertContained([literal], seen)

    for regex in regexes:
      self.assertTrue(re.search(regex, seen), 'Expected regex "%s" to match on:\n%s' % (regex, seen))

  def run_on_pty(self, cmd):
    master, slave = os.openpty()
    output = []

    try:
      env = os.environ.copy()
      env['TERM'] = 'xterm-color'
      proc = subprocess.Popen(cmd, stdout=slave, stderr=slave, env=env)
      while proc.poll() is None:
        r, w, x = select.select([master], [], [], 1)
        if r:
          output.append(os.read(master, 1024))
      return (proc.returncode, b''.join(output))
    finally:
      os.close(master)
      os.close(slave)

  def test_emcc_v(self):
    for compiler in [EMCC, EMXX]:
      # -v, without input files
      proc = run_process([PYTHON, compiler, '-v'], stdout=PIPE, stderr=PIPE)
      self.assertContained('clang version %s' % shared.expected_llvm_version(), proc.stderr)
      self.assertContained('GNU', proc.stderr)
      self.assertNotContained('this is dangerous', proc.stdout)
      self.assertNotContained('this is dangerous', proc.stderr)

  def test_emcc_generate_config(self):
    for compiler in [EMCC, EMXX]:
      config_path = './emscripten_config'
      run_process([PYTHON, compiler, '--generate-config', config_path])
      self.assertExists(config_path, 'A config file should have been created at %s' % config_path)
      config_contents = open(config_path).read()
      self.assertContained('EMSCRIPTEN_ROOT', config_contents)
      self.assertContained('LLVM_ROOT', config_contents)
      os.remove(config_path)

  def test_emcc_output_mjs(self):
    run_process([PYTHON, EMCC, '-o', 'hello_world.mjs', path_from_root('tests', 'hello_world.c')])
    with open('hello_world.mjs') as f:
      output = f.read()
    self.assertContained('export default Module;', output)
    # TODO(sbc): Test that this is actually runnable.  We currently don't have
    # any tests for EXPORT_ES6 but once we do this should be enabled.
    # self.assertContained('hello, world!', run_js('hello_world.mjs'))

  def test_emcc_out_file(self):
    # Verify that "-ofile" works in addition to "-o" "file"
    run_process([PYTHON, EMCC, '-c', '-ofoo.o', path_from_root('tests', 'hello_world.c')])
    assert os.path.exists('foo.o')
    run_process([PYTHON, EMCC, '-ofoo.js', 'foo.o'])
    assert os.path.exists('foo.js')

  def test_emcc_basics(self):
    for compiler, suffix in [(EMCC, '.c'), (EMXX, '.cpp')]:
      # --version
      output = run_process([PYTHON, compiler, '--version'], stdout=PIPE, stderr=PIPE)
      output = output.stdout.replace('\r', '')
      self.assertContained('emcc (Emscripten gcc/clang-like replacement)', output)
      self.assertContained('''Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
''', output)

      # --help
      output = run_process([PYTHON, compiler, '--help'], stdout=PIPE, stderr=PIPE)
      self.assertContained('Display this information', output.stdout)
      self.assertContained('Most clang options will work', output.stdout)

      # -dumpmachine
      output = run_process([PYTHON, compiler, '-dumpmachine'], stdout=PIPE, stderr=PIPE)
      self.assertContained(shared.get_llvm_target(), output.stdout)

      # -dumpversion
      output = run_process([PYTHON, compiler, '-dumpversion'], stdout=PIPE, stderr=PIPE)
      self.assertEqual(shared.EMSCRIPTEN_VERSION, output.stdout.strip(), 'results should be identical')

      # emcc src.cpp ==> writes a.out.js and a.out.wasm
      self.clear()
      run_process([PYTHON, compiler, path_from_root('tests', 'hello_world' + suffix)])
      self.assertExists('a.out.js')
      self.assertExists('a.out.wasm')
      self.assertContained('hello, world!', run_js('a.out.js'))

      # properly report source code errors, and stop there
      self.clear()
      stderr = self.expect_fail([PYTHON, compiler, path_from_root('tests', 'hello_world_error' + suffix)])
      self.assertNotContained('IOError', stderr) # no python stack
      self.assertNotContained('Traceback', stderr) # no python stack
      self.assertContained('error: invalid preprocessing directive', stderr)
      self.assertContained(["error: use of undeclared identifier 'cheez", "error: unknown type name 'cheez'"], stderr)
      self.assertContained('errors generated.', stderr.splitlines()[-2])

  def test_emcc_2(self):
    for compiler in [EMCC, EMXX]:
      suffix = '.c' if compiler == EMCC else '.cpp'

      # emcc src.cpp -c    and   emcc src.cpp -o src.[o|bc] ==> should give a .bc file
      #      regression check: -o js should create "js", with bitcode content
      for args in [['-c'], ['-o', 'src.o'], ['-o', 'src.bc'], ['-o', 'src.so'], ['-o', 'js'], ['-O1', '-c', '-o', '/dev/null'], ['-O1', '-o', '/dev/null']]:
        print('-c stuff', args)
        if '/dev/null' in args and WINDOWS:
          print('skip because windows')
          continue
        target = args[1] if len(args) == 2 else 'hello_world.o'
        self.clear()
        run_process([PYTHON, compiler, path_from_root('tests', 'hello_world' + suffix)] + args)
        if args[-1] == '/dev/null':
          print('(no output)')
          continue
        syms = Building.llvm_nm(target)
        assert 'main' in syms.defs
        if self.is_wasm_backend():
          # wasm backend will also have '__original_main' or such
          assert len(syms.defs) == 2
        else:
          assert len(syms.defs) == 1
        if target == 'js': # make sure emcc can recognize the target as a bitcode file
          shutil.move(target, target + '.bc')
          target += '.bc'
        run_process([PYTHON, compiler, target, '-o', target + '.js'])
        self.assertContained('hello, world!', run_js(target + '.js'))

  def test_emcc_3(self):
    for compiler in [EMCC, EMXX]:
      suffix = '.c' if compiler == EMCC else '.cpp'
      os.chdir(self.get_dir())
      self.clear()

      # handle singleton archives
      run_process([PYTHON, compiler, path_from_root('tests', 'hello_world' + suffix), '-o', 'a.bc'])
      run_process([LLVM_AR, 'r', 'a.a', 'a.bc'], stdout=PIPE, stderr=PIPE)
      run_process([PYTHON, compiler, 'a.a'])
      self.assertContained('hello, world!', run_js('a.out.js'))

      if not self.is_wasm_backend():
        # emcc src.ll ==> generates .js
        self.clear()
        run_process([PYTHON, compiler, path_from_root('tests', 'hello_world.ll')])
        self.assertContained('hello, world!', run_js('a.out.js'))

      # emcc [..] -o [path] ==> should work with absolute paths
      for path in [os.path.abspath(os.path.join('..', 'file1.js')), os.path.join('b_dir', 'file2.js')]:
        print(path)
        os.chdir(self.get_dir())
        self.clear()
        print(os.listdir(os.getcwd()))
        os.makedirs('a_dir')
        os.chdir('a_dir')
        os.makedirs('b_dir')
        # use single file so we don't have more files to clean up
        run_process([PYTHON, compiler, path_from_root('tests', 'hello_world' + suffix), '-o', path, '-s', 'SINGLE_FILE=1'])
        last = os.getcwd()
        os.chdir(os.path.dirname(path))
        self.assertContained('hello, world!', run_js(os.path.basename(path)))
        os.chdir(last)
        try_delete(path)

  def test_emcc_4(self):
    for compiler in [EMCC, EMXX]:
      # Optimization: emcc src.cpp -o something.js [-Ox]. -O0 is the same as not specifying any optimization setting
      for params, opt_level, bc_params, closure, has_malloc in [ # bc params are used after compiling to bitcode
        (['-o', 'something.js'],                          0, None, 0, 1),
        (['-o', 'something.js', '-O0'],                   0, None, 0, 0),
        (['-o', 'something.js', '-O1'],                   1, None, 0, 0),
        (['-o', 'something.js', '-O1', '-g'],             1, None, 0, 0), # no closure since debug
        (['-o', 'something.js', '-O2'],                   2, None, 0, 1),
        (['-o', 'something.js', '-O2', '-g'],             2, None, 0, 0),
        (['-o', 'something.js', '-Os'],                   2, None, 0, 1),
        (['-o', 'something.js', '-O3'],                   3, None, 0, 1),
        # and, test compiling to bitcode first
        (['-o', 'something.bc'], 0, [],      0, 0),
        (['-o', 'something.bc', '-O0'], 0, [], 0, 0),
        (['-o', 'something.bc', '-O1'], 1, ['-O1'], 0, 0),
        (['-o', 'something.bc', '-O2'], 2, ['-O2'], 0, 0),
        (['-o', 'something.bc', '-O3'], 3, ['-O3'], 0, 0),
        (['-O1', '-o', 'something.bc'], 1, [], 0, 0),
        # non-wasm
        (['-s', 'WASM=0', '-o', 'something.js'],                          0, None, 0, 1),
        (['-s', 'WASM=0', '-o', 'something.js', '-O0'],                   0, None, 0, 0),
        (['-s', 'WASM=0', '-o', 'something.js', '-O1'],                   1, None, 0, 0),
        (['-s', 'WASM=0', '-o', 'something.js', '-O1', '-g'],             1, None, 0, 0), # no closure since debug
        (['-s', 'WASM=0', '-o', 'something.js', '-O2'],                   2, None, 0, 1),
        (['-s', 'WASM=0', '-o', 'something.js', '-O2', '-g'],             2, None, 0, 0),
        (['-s', 'WASM=0', '-o', 'something.js', '-Os'],                   2, None, 0, 1),
        (['-s', 'WASM=0', '-o', 'something.js', '-O3'],                   3, None, 0, 1),
        # and, test compiling to bitcode first
        (['-s', 'WASM=0', '-o', 'something.bc'],        0, ['-s', 'WASM=0'],        0, 0),
        (['-s', 'WASM=0', '-o', 'something.bc', '-O0'], 0, ['-s', 'WASM=0'],        0, 0),
        (['-s', 'WASM=0', '-o', 'something.bc', '-O1'], 1, ['-s', 'WASM=0', '-O1'], 0, 0),
        (['-s', 'WASM=0', '-o', 'something.bc', '-O2'], 2, ['-s', 'WASM=0', '-O2'], 0, 0),
        (['-s', 'WASM=0', '-o', 'something.bc', '-O3'], 3, ['-s', 'WASM=0', '-O3'], 0, 0),
        (['-s', 'WASM=0', '-O1', '-o', 'something.bc'], 1, ['-s', 'WASM=0'],        0, 0),
      ]:
        if 'WASM=0' in params and self.is_wasm_backend():
          continue
        print(params, opt_level, bc_params, closure, has_malloc)
        self.clear()
        keep_debug = '-g' in params
        args = [PYTHON, compiler, path_from_root('tests', 'hello_world_loop' + ('_malloc' if has_malloc else '') + '.cpp')] + params
        print('..', args)
        output = run_process(args, stdout=PIPE, stderr=PIPE)
        assert len(output.stdout) == 0, output.stdout
        if bc_params is not None:
          self.assertExists('something.bc', output.stderr)
          bc_args = [PYTHON, compiler, 'something.bc', '-o', 'something.js'] + bc_params
          print('....', bc_args)
          output = run_process(bc_args, stdout=PIPE, stderr=PIPE)
        self.assertExists('something.js', output.stderr)
        self.assertContained('hello, world!', run_js('something.js'))

        # Verify optimization level etc. in the generated code
        # XXX these are quite sensitive, and will need updating when code generation changes
        generated = open('something.js').read()
        main = self.get_func(generated, '_main') if 'function _main' in generated else generated
        assert 'new Uint16Array' in generated and 'new Uint32Array' in generated, 'typed arrays 2 should be used by default'
        assert 'SAFE_HEAP' not in generated, 'safe heap should not be used by default'
        assert ': while(' not in main, 'when relooping we also js-optimize, so there should be no labelled whiles'
        if closure:
          if opt_level == 0:
            assert '._main =' in generated, 'closure compiler should have been run'
          elif opt_level >= 1:
            assert '._main=' in generated, 'closure compiler should have been run (and output should be minified)'
        else:
          # closure has not been run, we can do some additional checks. TODO: figure out how to do these even with closure
          assert '._main = ' not in generated, 'closure compiler should not have been run'
          if keep_debug:
            assert ('switch (label)' in generated or 'switch (label | 0)' in generated) == (opt_level <= 0), 'relooping should be in opt >= 1'
            assert ('assert(STACKTOP < STACK_MAX' in generated) == (opt_level == 0), 'assertions should be in opt == 0'
          if 'WASM=0' in params:
            if opt_level >= 2 and '-g' in params:
              assert re.search(r'HEAP8\[\$?\w+ ?\+ ?\(+\$?\w+ ?', generated) or re.search(r'HEAP8\[HEAP32\[', generated) or re.search(r'[i$]\d+ & ~\(1 << [i$]\d+\)', generated), 'eliminator should create compound expressions, and fewer one-time vars' # also in -O1, but easier to test in -O2
            looks_unminified = ' = {}' in generated and ' = []' in generated
            looks_minified = '={}' in generated and '=[]' and ';var' in generated
            assert not (looks_minified and looks_unminified)
            if opt_level == 0 or '-g' in params:
              assert looks_unminified
            elif opt_level >= 2:
              assert looks_minified

  @no_wasm_backend('tests for asmjs optimzer')
  def test_emcc_5(self):
    for compiler in [EMCC, EMXX]:
      # asm.js optimization levels
      for params, test, text in [
        (['-O2'], lambda generated: 'function addRunDependency' in generated, 'shell has unminified utilities'),
        (['-O2', '--closure', '1'], lambda generated: 'function addRunDependency' not in generated and ';function' in generated, 'closure minifies the shell, removes whitespace'),
        (['-O2', '--closure', '1', '-g1'], lambda generated: 'function addRunDependency' not in generated and ';function' not in generated, 'closure minifies the shell, -g1 makes it keep whitespace'),
        (['-O2'], lambda generated: 'var b=0' in generated and 'function _main' not in generated, 'registerize/minify is run by default in -O2'),
        (['-O2', '--minify', '0'], lambda generated: 'var b = 0' in generated and 'function _main' not in generated, 'minify is cancelled, but not registerize'),
        (['-O2', '--js-opts', '0'], lambda generated: 'var b=0' not in generated and 'var b = 0' not in generated and 'function _main' in generated, 'js opts are cancelled'),
        (['-O2', '-g'], lambda generated: 'var b=0' not in generated and 'var b = 0' not in generated and 'function _main' in generated, 'registerize/minify is cancelled by -g'),
        (['-O2', '-g0'], lambda generated: 'var b=0' in generated and 'function _main' not in generated, 'registerize/minify is run by default in -O2 -g0'),
        (['-O2', '-g1'], lambda generated: 'var b = 0' in generated and 'function _main' not in generated, 'compress is cancelled by -g1'),
        (['-O2', '-g2'], lambda generated: ('var b = 0' in generated or 'var i1 = 0' in generated) and 'function _main' in generated, 'minify is cancelled by -g2'),
        (['-O2', '-g3'], lambda generated: 'var b=0' not in generated and 'var b = 0' not in generated and 'function _main' in generated, 'registerize is cancelled by -g3'),
        (['-O2', '--profiling'], lambda generated: ('var b = 0' in generated or 'var i1 = 0' in generated) and 'function _main' in generated, 'similar to -g2'),
        (['-O2', '-profiling'], lambda generated: ('var b = 0' in generated or 'var i1 = 0' in generated) and 'function _main' in generated, 'similar to -g2'),
        (['-O2', '--profiling-funcs'], lambda generated: 'var b=0' in generated and '"use asm";var a=' in generated and 'function _main' in generated, 'very minified, but retain function names'),
        (['-O2', '-profiling-funcs'], lambda generated: 'var b=0' in generated and '"use asm";var a=' in generated and 'function _main' in generated, 'very minified, but retain function names'),
        (['-O2'], lambda generated: 'var b=0' in generated and '"use asm";var a=' in generated and 'function _main' not in generated, 'very minified, no function names'),
        # (['-O2', '-g4'], lambda generated: 'var b=0' not in generated and 'var b = 0' not in generated and 'function _main' in generated, 'same as -g3 for now'),
        (['-s', 'INLINING_LIMIT=0'], lambda generated: 'function _dump' in generated, 'no inlining without opts'),
        ([], lambda generated: 'Module["_dump"]' not in generated, 'dump is not exported by default'),
        (['-s', 'EXPORTED_FUNCTIONS=["_main", "_dump"]'], lambda generated: 'asm["_dump"];' in generated, 'dump is now exported'),
        (['--llvm-opts', '1'], lambda generated: '_puts(' in generated, 'llvm opts requested'),
        ([], lambda generated: '// Sometimes an existing Module' in generated, 'without opts, comments in shell code'),
        (['-O2'], lambda generated: '// Sometimes an existing Module' not in generated, 'with opts, no comments in shell code'),
        (['-O2', '-g2'], lambda generated: '// Sometimes an existing Module' not in generated, 'with -g2, no comments in shell code'),
        (['-O2', '-g3'], lambda generated: '// Sometimes an existing Module' in generated, 'with -g3, yes comments in shell code'),
      ]:
        print(params, text)
        self.clear()
        run_process([PYTHON, compiler, path_from_root('tests', 'hello_world_loop.cpp'), '-o', 'a.out.js', '-s', 'WASM=0'] + params)
        self.assertContained('hello, world!', run_js('a.out.js'))
        assert test(open('a.out.js').read()), text

  def test_multiple_sources(self):
    # Compiling two sources at a time should work.
    cmd = [PYTHON, EMCC, '-c', path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp')]
    run_process(cmd)

    # Object files should be generated by default in the current working
    # directory, and not alongside the sources.
    self.assertExists('twopart_main.o')
    self.assertExists('twopart_side.o')
    self.assertNotExists(path_from_root('tests', 'twopart_main.o'))
    self.assertNotExists(path_from_root('tests', 'twopart_side.o'))

    # But it is an error if '-o' is also specified.
    self.clear()
    err = self.expect_fail(cmd + ['-o', 'out.o'])

    self.assertContained('cannot specify -o with -c/-S and multiple source files', err)
    self.assertNotExists('twopart_main.o')
    self.assertNotExists('twopart_side.o')
    self.assertNotExists(path_from_root('tests', 'twopart_main.o'))
    self.assertNotExists(path_from_root('tests', 'twopart_side.o'))

  def test_combining_object_files(self):
    # Compiling two source files into a final JS.
    run_process([PYTHON, EMCC, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp')])
    self.assertContained('side got: hello from main, over', run_js('a.out.js'))

    # Compiling two files with -c will generate separate object files
    self.clear()
    run_process([PYTHON, EMCC, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp'), '-c'])
    self.assertExists('twopart_main.o')
    self.assertExists('twopart_side.o')

    # Compiling one of them alone is expected to fail
    err = self.expect_fail([PYTHON, EMCC, 'twopart_main.o'])
    self.assertContained('undefined symbol: _Z7theFuncPKc', err)

    # Combining both object files into js should work
    run_process([PYTHON, EMCC, 'twopart_main.o', 'twopart_side.o'])
    self.assertContained('side got: hello from main, over', run_js('a.out.js'))

    # Combining object files into another object should also work
    try_delete('a.out.js')
    run_process([PYTHON, EMCC, 'twopart_main.o', 'twopart_side.o', '-o', 'combined.o'])
    syms = Building.llvm_nm('combined.o')
    assert len(syms.defs) in (2, 3) and 'main' in syms.defs, 'Should be two functions (and in the wasm backend, also __original_main)'
    run_process([PYTHON, EMCC, 'combined.o', '-o', 'combined.o.js'])
    self.assertExists('combined.o.js')
    self.assertContained('side got: hello from main, over', run_js('combined.o.js'))

  def test_js_transform(self):
    with open('t.py', 'w') as f:
      f.write('''
import sys
f = open(sys.argv[1], 'a')
f.write('transformed!')
f.close()
''')

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '--js-transform', '%s t.py' % (PYTHON)])
    self.assertIn('transformed!', open('a.out.js').read())

  @no_wasm_backend("wasm backend alwasy embedds memory")
  def test_js_mem_file(self):
    for opts in [0, 1, 2, 3]:
      print('mem init in', opts)
      self.clear()
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '-O' + str(opts)])
      if opts >= 2:
        self.assertExists('a.out.js.mem')
      else:
        self.assertNotExists('a.out.js.mem')

  def test_emcc_asm_v_wasm(self):
    for opts in ([], ['-O1'], ['-O2'], ['-O3']):
      print('opts', opts)
      for mode in ([], ['-s', 'WASM=0']):
        self.clear()
        wasm = '=0' not in str(mode)
        print('  mode', mode, 'wasm?', wasm)
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')] + opts + mode)
        self.assertExists('a.out.js')
        if wasm:
          self.assertExists('a.out.wasm')
        for engine in JS_ENGINES:
          print('    engine', engine)
          out = run_js('a.out.js', engine=engine, stderr=PIPE, full_output=True)
          self.assertContained('hello, world!', out)
          if not wasm and engine == SPIDERMONKEY_ENGINE:
            self.validate_asmjs(out)
        if not wasm and not self.is_wasm_backend():
          src = open('a.out.js').read()
          if opts == []:
            assert 'almost asm' in src
          else:
            assert 'use asm' in src

  def test_emcc_cflags(self):
    output = run_process([PYTHON, EMCC, '--cflags'], stdout=PIPE)
    flags = output.stdout.strip()
    self.assertContained(' '.join(Building.doublequote_spaces(shared.emsdk_cflags())), flags)
    # check they work
    cmd = [CLANG, path_from_root('tests', 'hello_world.cpp')] + shlex.split(flags.replace('\\', '\\\\')) + ['-c', '-emit-llvm', '-o', 'a.bc']
    run_process(cmd)
    run_process([PYTHON, EMCC, 'a.bc'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_emcc_print_search_dirs(self):
    result = run_process([PYTHON, EMCC, '-print-search-dirs'], stdout=PIPE, stderr=PIPE)
    self.assertContained(['programs: =', 'libraries: ='], result.stdout, check_all=True)

  def test_emar_em_config_flag(self):
    # Test that the --em-config flag is accepted but not passed down do llvm-ar.
    # We expand this in case the EM_CONFIG is ~/.emscripten (default)
    config = os.path.expanduser(shared.EM_CONFIG)
    proc = run_process([PYTHON, EMAR, '--em-config', config, '-version'], stdout=PIPE, stderr=PIPE)
    self.assertEqual(proc.stderr, "")
    self.assertContained('LLVM', proc.stdout)

  def test_cmake(self):
    # Test all supported generators.
    if WINDOWS:
      generators = ['MinGW Makefiles', 'NMake Makefiles']
    else:
      generators = ['Unix Makefiles', 'Ninja', 'Eclipse CDT4 - Ninja']

    def nmake_detect_error(configuration):
      if Building.which(configuration['build'][0]):
        return None
      else:
        return 'Skipping NMake test for CMake support, since nmake was not found in PATH. Run this test in Visual Studio command prompt to easily access nmake.'

    def check_makefile(dirname):
      self.assertExists(dirname + '/Makefile', 'CMake call did not produce a Makefile!')

    configurations = {'MinGW Makefiles'     : {'prebuild': check_makefile, # noqa
                                               'build'   : ['mingw32-make'], # noqa
                      },
                      'NMake Makefiles'     : {'detect'  : nmake_detect_error, # noqa
                                               'prebuild': check_makefile, # noqa
                                               'build'   : ['nmake', '/NOLOGO'], # noqa
                      },
                      'Unix Makefiles'      : {'prebuild': check_makefile, # noqa
                                               'build'   : ['make'], # noqa
                      },
                      'Ninja'               : {'build'   : ['ninja'], # noqa
                      },
                      'Eclipse CDT4 - Ninja': {'build'   : ['ninja'], # noqa
                      }
    }

    if WINDOWS:
      emconfigure = path_from_root('emconfigure.bat')
    else:
      emconfigure = path_from_root('emconfigure')

    for generator in generators:
      conf = configurations[generator]

      make = conf['build']
      detector = conf.get('detect')
      prebuild = conf.get('prebuild')

      if detector:
        error = detector(conf)
      elif len(make) == 1 and not Building.which(make[0]):
        # Use simple test if applicable
        error = 'Skipping %s test for CMake support, since it could not be detected.' % generator
      else:
        error = None

      if error:
        print(error)
        continue

      # ('directory to the test', 'output filename', ['extra args to pass to
      # CMake']) Testing all combinations would be too much work and the test
      # would take 10 minutes+ to finish (CMake feature detection is slow), so
      # combine multiple features into one to try to cover as much as possible
      # while still keeping this test in sensible time limit.
      cases = [
        ('target_js',      'test_cmake.js',         ['-DCMAKE_BUILD_TYPE=Debug']),
        ('target_html',    'hello_world_gles.html', ['-DCMAKE_BUILD_TYPE=Release']),
        ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=MinSizeRel']),
        ('target_library', 'libtest_cmake.a',       ['-DCMAKE_BUILD_TYPE=RelWithDebInfo', '-DCPP_LIBRARY_TYPE=STATIC']),
        ('stdproperty',    'helloworld.js',         [])
      ]
      for test_dir, output_file, cmake_args in cases:
        cmakelistsdir = path_from_root('tests', 'cmake', test_dir)
        with temp_directory(self.get_dir()) as tempdirname:
          # Run Cmake
          cmd = [emconfigure, 'cmake'] + cmake_args + ['-G', generator, cmakelistsdir]

          env = os.environ.copy()
          # https://github.com/emscripten-core/emscripten/pull/5145: Check that CMake works even if EMCC_SKIP_SANITY_CHECK=1 is passed.
          if test_dir == 'target_html':
            env['EMCC_SKIP_SANITY_CHECK'] = '1'
          print(str(cmd))
          ret = run_process(cmd, env=env, stdout=None if EM_BUILD_VERBOSE >= 2 else PIPE, stderr=None if EM_BUILD_VERBOSE >= 1 else PIPE)
          if ret.stderr is not None and len(ret.stderr.strip()):
            print(ret.stderr) # If there were any errors, print them directly to console for diagnostics.
          if ret.stderr is not None and 'error' in ret.stderr.lower():
            print('Failed command: ' + ' '.join(cmd))
            print('Result:\n' + ret.stderr)
            self.fail('cmake call failed!')

          if prebuild:
            prebuild(tempdirname)

          # Build
          cmd = make
          if EM_BUILD_VERBOSE >= 3 and 'Ninja' not in generator:
            cmd += ['VERBOSE=1']
          ret = run_process(cmd, stdout=None if EM_BUILD_VERBOSE >= 2 else PIPE)
          if ret.stderr is not None and len(ret.stderr.strip()):
            print(ret.stderr) # If there were any errors, print them directly to console for diagnostics.
          if ret.stdout is not None and 'error' in ret.stdout.lower() and '0 error(s)' not in ret.stdout.lower():
            print('Failed command: ' + ' '.join(cmd))
            print('Result:\n' + ret.stdout)
            self.fail('make failed!')
          self.assertExists(tempdirname + '/' + output_file, 'Building a cmake-generated Makefile failed to produce an output file %s!' % tempdirname + '/' + output_file)

          # Run through node, if CMake produced a .js file.
          if output_file.endswith('.js'):
            ret = run_process(NODE_JS + [tempdirname + '/' + output_file], stdout=PIPE).stdout
            self.assertTextDataIdentical(open(cmakelistsdir + '/out.txt').read().strip(), ret.strip())

  # Test that the various CMAKE_xxx_COMPILE_FEATURES that are advertised for the Emscripten toolchain match with the actual language features that Clang supports.
  # If we update LLVM version and this test fails, copy over the new advertised features from Clang and place them to cmake/Modules/Platform/Emscripten.cmake.
  @no_windows('Skipped on Windows because CMake does not configure native Clang builds well on Windows.')
  def test_cmake_compile_features(self):
    with temp_directory(self.get_dir()):
      cmd = ['cmake', '-DCMAKE_C_COMPILER=' + CLANG_CC, '-DCMAKE_CXX_COMPILER=' + CLANG_CPP, path_from_root('tests', 'cmake', 'stdproperty')]
      print(str(cmd))
      native_features = run_process(cmd, stdout=PIPE).stdout

    if WINDOWS:
      emconfigure = path_from_root('emcmake.bat')
    else:
      emconfigure = path_from_root('emcmake')

    with temp_directory(self.get_dir()):
      cmd = [emconfigure, 'cmake', path_from_root('tests', 'cmake', 'stdproperty')]
      print(str(cmd))
      emscripten_features = run_process(cmd, stdout=PIPE).stdout

    native_features = '\n'.join([x for x in native_features.split('\n') if '***' in x])
    emscripten_features = '\n'.join([x for x in emscripten_features.split('\n') if '***' in x])
    self.assertTextDataIdentical(native_features, emscripten_features)

  # Tests that it's possible to pass C++11 or GNU++11 build modes to CMake by building code that needs C++11 (embind)
  def test_cmake_with_embind_cpp11_mode(self):
    for args in [[], ['-DNO_GNU_EXTENSIONS=1']]:
      with temp_directory(self.get_dir()) as tempdirname:
        configure = [path_from_root('emcmake.bat' if WINDOWS else 'emcmake'), 'cmake', path_from_root('tests', 'cmake', 'cmake_with_emval')] + args
        print(str(configure))
        run_process(configure)
        build = ['cmake', '--build', '.']
        print(str(build))
        run_process(build)

        ret = run_process(NODE_JS + [os.path.join(tempdirname, 'cpp_with_emscripten_val.js')], stdout=PIPE).stdout.strip()
        if '-DNO_GNU_EXTENSIONS=1' in args:
          self.assertTextDataIdentical('Hello! __STRICT_ANSI__: 1, __cplusplus: 201103', ret)
        else:
          self.assertTextDataIdentical('Hello! __STRICT_ANSI__: 0, __cplusplus: 201103', ret)

  # Tests that the Emscripten CMake toolchain option
  # -DEMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES=ON works.
  def test_cmake_bitcode_static_libraries(self):
    if WINDOWS:
      emcmake = path_from_root('emcmake.bat')
    else:
      emcmake = path_from_root('emcmake')

    # Test that building static libraries by default generates UNIX archives (.a, with the emar tool)
    self.clear()
    run_process([emcmake, 'cmake', path_from_root('tests', 'cmake', 'static_lib')])
    run_process([Building.which('cmake'), '--build', '.'])
    assert Building.is_ar('libstatic_lib.a')
    run_process([PYTHON, EMAR, 'x', 'libstatic_lib.a'])
    found = False # hashing makes the object name random
    for x in os.listdir('.'):
      if x.endswith('.o'):
        found = True
        if self.is_wasm_backend():
          assert Building.is_wasm(x)
        else:
          assert Building.is_bitcode(x)
    assert found

    # Test that passing the -DEMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES=ON
    # directive causes CMake to generate LLVM bitcode files as static libraries
    # (.bc)
    self.clear()
    run_process([emcmake, 'cmake', '-DEMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES=ON', path_from_root('tests', 'cmake', 'static_lib')])
    run_process([Building.which('cmake'), '--build', '.'])
    if self.is_wasm_backend():
      assert Building.is_wasm('libstatic_lib.bc')
    else:
      assert Building.is_bitcode('libstatic_lib.bc')
    assert not Building.is_ar('libstatic_lib.bc')

    # Test that one is able to fake custom suffixes for static libraries.
    # (sometimes projects want to emulate stuff, and do weird things like files
    # with ".so" suffix which are in fact either ar archives or bitcode files)
    self.clear()
    run_process([emcmake, 'cmake', '-DSET_FAKE_SUFFIX_IN_PROJECT=1', path_from_root('tests', 'cmake', 'static_lib')])
    run_process([Building.which('cmake'), '--build', '.'])
    assert Building.is_ar('myprefix_static_lib.somecustomsuffix')

  # Tests that the CMake variable EMSCRIPTEN_VERSION is properly provided to user CMake scripts
  def test_cmake_emscripten_version(self):
    if WINDOWS:
      emcmake = path_from_root('emcmake.bat')
    else:
      emcmake = path_from_root('emcmake')

    run_process([emcmake, 'cmake', path_from_root('tests', 'cmake', 'emscripten_version')])

  def test_system_include_paths(self):
    # Verify that all default include paths are within `emscripten/system`

    def verify_includes(stderr):
      self.assertContained('<...> search starts here:', stderr)
      assert stderr.count('End of search list.') == 1, stderr
      start = stderr.index('<...> search starts here:')
      end = stderr.index('End of search list.')
      includes = stderr[start:end]
      includes = [i.strip() for i in includes.splitlines()[1:-1]]
      for i in includes:
        self.assertContained(path_from_root('system'), i)

    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-v'], stderr=PIPE).stderr
    verify_includes(err)
    err = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-v'], stderr=PIPE).stderr
    verify_includes(err)

  def test_failure_error_code(self):
    for compiler in [EMCC, EMXX]:
      # Test that if one file is missing from the build, then emcc shouldn't succeed, and shouldn't produce an output file.
      self.expect_fail([PYTHON, compiler, path_from_root('tests', 'hello_world.c'), 'this_file_is_missing.c', '-o', 'out.js'])
      self.assertFalse(os.path.exists('out.js'))

  def test_use_cxx(self):
    create_test_file('empty_file', ' ')
    dash_xc = run_process([PYTHON, EMCC, '-v', '-xc', 'empty_file'], stderr=PIPE).stderr
    self.assertNotContained('-std=c++03', dash_xc)
    dash_xcpp = run_process([PYTHON, EMCC, '-v', '-xc++', 'empty_file'], stderr=PIPE).stderr
    self.assertContained('-std=c++03', dash_xcpp)

  def test_cxx03(self):
    for compiler in [EMCC, EMXX]:
      run_process([PYTHON, compiler, path_from_root('tests', 'hello_cxx03.cpp')])

  def test_cxx11(self):
    for std in ['-std=c++11', '--std=c++11']:
      for compiler in [EMCC, EMXX]:
        run_process([PYTHON, compiler, std, path_from_root('tests', 'hello_cxx11.cpp')])

  # Regression test for issue #4522: Incorrect CC vs CXX detection
  def test_incorrect_c_detection(self):
    create_test_file('test.c', 'foo\n')
    for compiler in [EMCC, EMXX]:
      run_process([PYTHON, compiler, '--bind', '--embed-file', 'test.c', path_from_root('tests', 'hello_world.cpp')])

  def test_odd_suffixes(self):
    for suffix in ['CPP', 'c++', 'C++', 'cxx', 'CXX', 'cc', 'CC', 'i', 'ii']:
      if self.is_wasm_backend() and suffix == 'ii':
        # wasm backend treats .i and .ii specially and considers them already
        # pre-processed.  Because if this is strips all the -D command line
        # flags, including the __EMSCRIPTEN__ define, which makes this fail
        # to compile since libcxx/__config depends in __EMSCRIPTEN__.
        continue
      self.clear()
      print(suffix)
      shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'test.' + suffix)
      run_process([PYTHON, EMCC, self.in_dir('test.' + suffix)])
      self.assertContained('hello, world!', run_js('a.out.js'))

    for suffix in ['lo']:
      self.clear()
      print(suffix)
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'binary.' + suffix])
      run_process([PYTHON, EMCC, 'binary.' + suffix])
      self.assertContained('hello, world!', run_js('a.out.js'))

  @no_wasm_backend('asm.js minification')
  def test_asm_minify(self):
    def test(args):
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world_loop_malloc.cpp'), '-s', 'WASM=0'] + args)
      self.assertContained('hello, world!', run_js('a.out.js'))
      return open('a.out.js').read()

    src = test([])
    assert 'function _malloc' in src

    src = test(['-O2', '-s', 'ASM_JS=1'])
    normal_size = len(src)
    print('normal', normal_size)
    assert 'function _malloc' not in src

    src = test(['-O2', '-s', 'ASM_JS=1', '--minify', '0'])
    unminified_size = len(src)
    print('unminified', unminified_size)
    assert unminified_size > normal_size
    assert 'function _malloc' not in src

    src = test(['-O2', '-s', 'ASM_JS=1', '-g'])
    debug_size = len(src)
    print('debug', debug_size)
    assert debug_size > unminified_size
    assert 'function _malloc' in src

  @no_wasm_backend('tests fastcomp extra assertions for function pointer errors - do we need these?')
  def test_dangerous_func_cast(self):
    src = r'''
      #include <stdio.h>
      typedef void (*voidfunc)();
      int my_func() {
        printf("my func\n");
        return 10;
      }
      int main(int argc, char **argv) {
        voidfunc fps[10];
        for (int i = 0; i < 10; i++)
          fps[i] = (i == argc) ? (void (*)())my_func : NULL;
        fps[2 * (argc-1) + 1]();
        return 0;
      }
    '''
    create_test_file('src.c', src)

    def test(args, expected):
      print(args, expected)
      run_process([PYTHON, EMCC, 'src.c'] + args, stderr=PIPE)
      self.assertContained(expected, run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None))
      if self.is_wasm_backend():
        return
      print('in asm.js')
      run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM=0'] + args, stderr=PIPE)
      self.assertContained(expected, run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None))
      # TODO: emulation function support in wasm is imperfect
      print('with emulated function pointers in asm.js')
      run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c', '-s', 'ASSERTIONS=1'] + args + ['-s', 'EMULATED_FUNCTION_POINTERS=1'], stderr=PIPE)
      out = run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None)
      self.assertContained(expected, out)

    # fastcomp. all asm, so it can't just work with wrong sigs. but,
    # ASSERTIONS=2 gives much better info to debug
    # Case 1: No useful info, but does mention ASSERTIONS
    test(['-O1'], 'ASSERTIONS')
    # Case 2: Some useful text
    test(['-O1', '-s', 'ASSERTIONS=1'], [
        'Invalid function pointer',
        "called with signature 'v'. Perhaps this is an invalid value",
        'Build with ASSERTIONS=2 for more info'
    ])
    # Case 3: actually useful identity of the bad pointer, with comparisons to
    # what it would be in other types/tables
    test(['-O1', '-s', 'ASSERTIONS=2'], [
        'Invalid function pointer',
        "called with signature 'v'. Perhaps this is an invalid value",
        'This pointer might make sense in another type signature:',
        'Invalid function pointer',
        "called with signature 'v'. Perhaps this is an invalid value",
        "i: asm['_my_func']"
    ])
    # Case 4: emulate so it works
    test(['-O1', '-s', 'EMULATE_FUNCTION_POINTER_CASTS=1'], 'my func\n')

  @no_wasm_backend('uses EMULATED_FUNCTION_POINTERS')
  def test_emulate_function_pointer_casts_assertions_2(self):
    # check empty tables work with assertions 2 in this mode (#6554)
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EMULATED_FUNCTION_POINTERS=1', '-s', 'ASSERTIONS=2'])

  def test_wl_linkflags(self):
    # Test path -L and -l via -Wl, arguments and -Wl, response files
    create_test_file('main.cpp', '''
      extern "C" void printey();
      int main() {
        printey();
        return 0;
      }
    ''')
    create_test_file('libfile.cpp', '''
      #include <stdio.h>
      extern "C" void printey() {
        printf("hello from lib\\n");
      }
    ''')
    create_test_file('linkflags.txt', '''
    -L.
    -lfoo
    ''')
    run_process([PYTHON, EMCC, '-o', 'libfile.o', 'libfile.cpp'])
    run_process([PYTHON, EMAR, 'cr', 'libfoo.a', 'libfile.o'])
    run_process([PYTHON, EMCC, 'main.cpp', '-L.', '-lfoo'])
    run_process([PYTHON, EMCC, 'main.cpp', '-Wl,-L.', '-Wl,-lfoo'])
    run_process([PYTHON, EMCC, 'main.cpp', '-Wl,@linkflags.txt'])

  def test_l_link(self):
    # Linking with -lLIBNAME and -L/DIRNAME should work, also should work with spaces
    create_test_file('main.cpp', '''
      extern void printey();
      int main() {
        printey();
        return 0;
      }
    ''')
    create_test_file('libfile.cpp', '''
      #include <stdio.h>
      void printey() {
        printf("hello from lib\\n");
      }
    ''')

    try:
      os.makedirs('libdir')
    except OSError:
      pass

    libfile = self.in_dir('libdir', 'libfile.so')
    aout = 'a.out.js'

    def build(path, args):
      run_process([PYTHON, EMCC, path] + args)

    # Test linking the library built here by emcc
    build('libfile.cpp', ['-c'])
    shutil.move('libfile.o', libfile)
    build('main.cpp', ['-L' + 'libdir', '-lfile'])

    self.assertContained('hello from lib', run_js(aout))

    # Also test execution with `-l c` and space-separated library linking syntax
    os.remove(aout)
    build('libfile.cpp', ['-c', '-l', 'c'])
    shutil.move('libfile.o', libfile)
    build('main.cpp', ['-L', 'libdir', '-l', 'file'])

    self.assertContained('hello from lib', run_js(aout))

    assert not os.path.exists('a.out') and not os.path.exists('a.exe'), 'Must not leave unneeded linker stubs'

  def test_commons_link(self):
    create_test_file('a.h', r'''
#if !defined(A_H)
#define A_H
extern int foo[8];
#endif
''')
    create_test_file('a.c', r'''
#include "a.h"
int foo[8];
''')
    create_test_file('main.c', r'''
#include <stdio.h>
#include "a.h"

int main() {
    printf("|%d|\n", foo[0]);
    return 0;
}
''')

    run_process([PYTHON, EMCC, '-o', 'a.o', 'a.c'])
    run_process([PYTHON, EMAR, 'rv', 'library.a', 'a.o'])
    run_process([PYTHON, EMCC, '-o', 'main.o', 'main.c'])
    run_process([PYTHON, EMCC, '-o', 'a.js', 'main.o', 'library.a'])
    self.assertContained('|0|', run_js('a.js'))

  @parameterized({
    'expand_symlinks': [[]],
    'no-canonical-prefixes': [['-no-canonical-prefixes']],
  })
  @no_windows('Windows does not support symlinks')
  def test_symlink_points_to_bad_suffix(self, flags):
    """Tests compiling a symlink where foobar.c points to foobar.xxx.

    In this case, we should always successfully compile the code."""
    create_test_file('foobar.xxx', 'int main(){ return 0; }')
    os.symlink('foobar.xxx', 'foobar.c')
    run_process([PYTHON, EMCC, 'foobar.c', '-o', 'foobar.bc'] + flags)

  @parameterized({
    'expand_symlinks': ([], True),
    'no-canonical-prefixes': (['-no-canonical-prefixes'], False),
  })
  @no_windows('Windows does not support symlinks')
  def test_symlink_has_bad_suffix(self, flags, expect_success):
    """Tests compiling a symlink where foobar.xxx points to foobar.c.

    In this case, setting -no-canonical-prefixes will result in a build failure
    due to the inappropriate file suffix on foobar.xxx."""
    create_test_file('foobar.c', 'int main(){ return 0; }')
    os.symlink('foobar.c', 'foobar.xxx')
    proc = run_process([PYTHON, EMCC, 'foobar.xxx', '-o', 'foobar.bc'] + flags, check=expect_success, stderr=PIPE)
    if not expect_success:
      self.assertNotEqual(proc.returncode, 0)
      self.assertContained("unknown suffix", proc.stderr)

  def test_multiply_defined_libsymbols(self):
    lib_name = 'libA.c'
    a2_name = 'a2.c'
    b2_name = 'b2.c'
    main_name = 'main.c'
    create_test_file(lib_name, 'int mult() { return 1; }')
    create_test_file(a2_name, 'void x() {}')
    create_test_file(b2_name, 'void y() {}')
    create_test_file(main_name, r'''
      #include <stdio.h>
      int mult();
      int main() {
        printf("result: %d\n", mult());
        return 0;
      }
    ''')

    Building.emcc(lib_name, output_filename='libA.so')

    Building.emcc(a2_name, ['-L.', '-lA'])
    Building.emcc(b2_name, ['-L.', '-lA'])

    Building.emcc(main_name, ['-L.', '-lA', a2_name + '.o', b2_name + '.o'], output_filename='a.out.js')

    self.assertContained('result: 1', run_js('a.out.js'))

  def test_multiply_defined_libsymbols_2(self):
    a = "int x() { return 55; }"
    a_name = 'a.c'
    create_test_file(a_name, a)
    b = "int y() { return 2; }"
    b_name = 'b.c'
    create_test_file(b_name, b)
    c = "int z() { return 5; }"
    c_name = 'c.c'
    create_test_file(c_name, c)
    main = r'''
      #include <stdio.h>
      int x();
      int y();
      int z();
      int main() {
        printf("result: %d\n", x() + y() + z());
        return 0;
      }
    '''
    main_name = 'main.c'
    create_test_file(main_name, main)

    Building.emcc(a_name) # a.c.o
    Building.emcc(b_name) # b.c.o
    Building.emcc(c_name) # c.c.o
    lib_name = 'libLIB.a'
    Building.emar('cr', lib_name, [a_name + '.o', b_name + '.o']) # libLIB.a with a and b

    # a is in the lib AND in an .o, so should be ignored in the lib. We do still need b from the lib though
    Building.emcc(main_name, [a_name + '.o', c_name + '.o', '-L.', '-lLIB'], output_filename='a.out.js')

    self.assertContained('result: 62', run_js('a.out.js'))

  @no_wasm_backend('not relevent with lld')
  def test_link_group(self):
    lib_src_name = 'lib.c'
    create_test_file(lib_src_name, 'int x() { return 42; }')

    main_name = 'main.c'
    create_test_file(main_name, r'''
      #include <stdio.h>
      int x();
      int main() {
        printf("result: %d\n", x());
        return 0;
      }
    ''')

    Building.emcc(lib_src_name) # lib.c.o
    lib_name = 'libLIB.a'
    Building.emar('cr', lib_name, [lib_src_name + '.o']) # libLIB.a with lib.c.o

    def test(lib_args, err_expected):
      print(err_expected)
      output = run_process([PYTHON, EMCC, main_name, '-o', 'a.out.js'] + lib_args, stdout=PIPE, stderr=PIPE, check=not err_expected)
      if err_expected:
        self.assertContained(err_expected, output.stderr)
      else:
        self.assertNotContained('undefined symbol', output.stderr)
        out_js = 'a.out.js'
        self.assertExists(out_js, output.stdout + '\n' + output.stderr)
        self.assertContained('result: 42', run_js(out_js))

    test(['-Wl,--start-group', lib_name, '-Wl,--start-group'], 'Nested --start-group, missing --end-group?')
    test(['-Wl,--end-group', lib_name, '-Wl,--start-group'], '--end-group without --start-group')
    test(['-Wl,--start-group', lib_name, '-Wl,--end-group'], None)
    test(['-Wl,--start-group', lib_name], None)

    print('embind test with groups')

    main_name = 'main.cpp'
    create_test_file(main_name, r'''
      #include <stdio.h>
      #include <emscripten/val.h>
      using namespace emscripten;
      extern "C" int x();
      int main() {
        int y = -x();
        y = val::global("Math").call<int>("abs", y);
        printf("result: %d\n", y);
        return 0;
      }
    ''')
    test(['-Wl,--start-group', lib_name, '-Wl,--end-group', '--bind'], None)

  def test_whole_archive(self):
    # Verify that -Wl,--whole-archive includes the static constructor from the
    # otherwise unreferenced library.
    run_process([PYTHON, EMCC, '-c', '-o', 'main.o', path_from_root('tests', 'test_whole_archive', 'main.c')])
    run_process([PYTHON, EMCC, '-c', '-o', 'testlib.o', path_from_root('tests', 'test_whole_archive', 'testlib.c')])
    run_process([PYTHON, EMAR, 'crs', 'libtest.a', 'testlib.o'])

    run_process([PYTHON, EMCC, '-Wl,--whole-archive', 'libtest.a', '-Wl,--no-whole-archive', 'main.o'])
    self.assertContained('foo is: 42\n', run_js('a.out.js'))

    run_process([PYTHON, EMCC, '-Wl,-whole-archive', 'libtest.a', '-Wl,-no-whole-archive', 'main.o'])
    self.assertContained('foo is: 42\n', run_js('a.out.js'))

    # Verify the --no-whole-archive prevents the inclusion of the ctor
    run_process([PYTHON, EMCC, '-Wl,-whole-archive', '-Wl,--no-whole-archive', 'libtest.a', 'main.o'])
    self.assertContained('foo is: 0\n', run_js('a.out.js'))

  def test_link_group_bitcode(self):
    create_test_file('1.c', r'''
int f(void);
int main() {
  f();
  return 0;
}
''')
    create_test_file('2.c', r'''
#include <stdio.h>
int f() {
  printf("Hello\n");
  return 0;
}
''')

    run_process([PYTHON, EMCC, '-o', '1.o', '1.c'])
    run_process([PYTHON, EMCC, '-o', '2.o', '2.c'])
    run_process([PYTHON, EMAR, 'crs', '2.a', '2.o'])
    run_process([PYTHON, EMCC, '-o', 'out.bc', '-Wl,--start-group', '2.a', '1.o', '-Wl,--end-group'])
    run_process([PYTHON, EMCC, 'out.bc'])
    self.assertContained('Hello', run_js('a.out.js'))

  @no_wasm_backend('lld resolves circular lib dependencies')
  def test_circular_libs(self):
    def tmp_source(name, code):
      with open(name, 'w') as f:
        f.write(code)

    tmp_source('a.c', 'int z(); int x() { return z(); }')
    tmp_source('b.c', 'int x(); int y() { return x(); } int z() { return 42; }')
    tmp_source('c.c', 'int q() { return 0; }')
    tmp_source('main.c', r'''
      #include <stdio.h>
      int y();
      int main() {
        printf("result: %d\n", y());
        return 0;
      }
    ''')

    Building.emcc('a.c') # a.c.o
    Building.emcc('b.c') # b.c.o
    Building.emcc('c.c')
    Building.emar('cr', 'libA.a', ['a.c.o', 'c.c.o'])
    Building.emar('cr', 'libB.a', ['b.c.o', 'c.c.o'])

    args = ['main.c', '-o', 'a.out.js']
    libs_list = ['libA.a', 'libB.a']

    # 'libA.a' does not satisfy any symbols from main, so it will not be included,
    # and there will be an undefined symbol.
    err = self.expect_fail([PYTHON, EMCC] + args + libs_list)
    self.assertContained('error: undefined symbol: x', err)

    # -Wl,--start-group and -Wl,--end-group around the libs will cause a rescan
    # of 'libA.a' after 'libB.a' adds undefined symbol "x", so a.c.o will now be
    # included (and the link will succeed).
    libs = ['-Wl,--start-group'] + libs_list + ['-Wl,--end-group']
    run_process([PYTHON, EMCC] + args + libs)
    self.assertContained('result: 42', run_js('a.out.js'))

    # -( and -) should also work.
    args = ['main.c', '-o', 'a2.out.js']
    libs = ['-Wl,-('] + libs_list + ['-Wl,-)']
    run_process([PYTHON, EMCC] + args + libs)
    self.assertContained('result: 42', run_js('a2.out.js'))

  # The fastcomp path will deliberately ignore duplicate input files in order
  # to allow "libA.so" on the command line twice. The is not really .so support
  # and the .so files are really bitcode.
  @no_wasm_backend('tests legacy .so linking behviour')
  @needs_dlfcn
  def test_redundant_link(self):
    lib = "int mult() { return 1; }"
    lib_name = 'libA.c'
    create_test_file(lib_name, lib)
    main = r'''
      #include <stdio.h>
      int mult();
      int main() {
        printf("result: %d\n", mult());
        return 0;
      }
    '''
    main_name = 'main.c'
    create_test_file(main_name, main)

    Building.emcc(lib_name, output_filename='libA.so')

    Building.emcc(main_name, ['libA.so', 'libA.so'], output_filename='a.out.js')

    self.assertContained('result: 1', run_js('a.out.js'))

  @no_wasm_backend('archive contents handling differ with lld')
  def test_dot_a_all_contents_invalid(self):
    # check that we warn if an object file in a .a is not valid bitcode.
    # do not silently ignore native object files, which may have been
    # built by mistake
    create_test_file('side.cpp', r'''int side() { return 5; }''')
    create_test_file('main.cpp', r'''extern int side(); int main() { return side(); }''')
    run_process([CLANG, 'side.cpp', '-c', '-o', 'native.o'])
    run_process([PYTHON, EMAR, 'crs', 'foo.a', 'native.o'])
    proc = run_process([PYTHON, EMCC, 'main.cpp', 'foo.a', '-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0'], stderr=PIPE)
    self.assertContained('is not a valid object file for emscripten, cannot link', proc.stderr)

  def test_export_all(self):
    lib = r'''
      #include <stdio.h>
      void libf1() { printf("libf1\n"); }
      void libf2() { printf("libf2\n"); }
    '''
    create_test_file('lib.c', lib)

    create_test_file('main.js', '''
      var Module = {
        onRuntimeInitialized: function() {
          _libf1();
          _libf2();
        }
      };
    ''')

    Building.emcc('lib.c', ['-s', 'EXPORT_ALL', '-s', 'LINKABLE', '--pre-js', 'main.js'], output_filename='a.out.js')
    self.assertContained('libf1\nlibf2\n', run_js('a.out.js'))

  def test_export_all_and_exported_functions(self):
    # EXPORT_ALL should not export library functions by default.
    # This mans that to export library function you also need to explicitly
    # list them in EXPORTED_FUNCTIONS.
    lib = r'''
      #include <stdio.h>
      #include <emscripten.h>
      EMSCRIPTEN_KEEPALIVE void libfunc() { puts("libfunc\n"); }
    '''
    create_test_file('lib.c', lib)
    create_test_file('main.js', '''
      var Module = {
        onRuntimeInitialized: function() {
          _libfunc();
          __get_daylight();
        }
      };
    ''')

    # __get_daylight should not be linked by default, even with EXPORT_ALL
    Building.emcc('lib.c', ['-s', 'EXPORT_ALL', '--pre-js', 'main.js'], output_filename='a.out.js')
    err = run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None)
    self.assertContained('__get_daylight is not defined', err)

    Building.emcc('lib.c', ['-s', "EXPORTED_FUNCTIONS=['__get_daylight']", '-s', 'EXPORT_ALL', '--pre-js', 'main.js'], output_filename='a.out.js')
    self.assertContained('libfunc\n', run_js('a.out.js'))

  def test_stdin(self):
    def make_js_command(filename, engine):
      if engine is None:
        engine = tools.shared.JS_ENGINES[0]
      return jsrun.make_command(filename, engine)

    def run_test():
      for engine in JS_ENGINES:
        if engine == V8_ENGINE:
          continue # no stdin support in v8 shell
        engine[0] = os.path.normpath(engine[0])
        print(engine, file=sys.stderr)
        # work around a bug in python's subprocess module
        # (we'd use run_js() normally)
        try_delete('out.txt')
        jscommand = make_js_command(os.path.normpath(exe), engine)
        if WINDOWS:
          os.system('type "in.txt" | {} >out.txt'.format(' '.join(Building.doublequote_spaces(jscommand))))
        else: # posix
          os.system('cat in.txt | {} > out.txt'.format(' '.join(Building.doublequote_spaces(jscommand))))
        self.assertContained('abcdef\nghijkl\neof', open('out.txt').read())

    Building.emcc(path_from_root('tests', 'module', 'test_stdin.c'), output_filename='a.out.js')
    create_test_file('in.txt', 'abcdef\nghijkl')
    exe = 'a.out.js'
    run_test()
    Building.emcc(path_from_root('tests', 'module', 'test_stdin.c'),
                  ['-O2', '--closure', '1'],
                  output_filename='a.out.js')
    run_test()

  def test_ungetc_fscanf(self):
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      int main(int argc, char const *argv[])
      {
          char str[4] = {0};
          FILE* f = fopen("my_test.input", "r");
          if (f == NULL) {
              printf("cannot open file\n");
              return -1;
          }
          ungetc('x', f);
          ungetc('y', f);
          ungetc('z', f);
          fscanf(f, "%3s", str);
          printf("%s\n", str);
          return 0;
      }
    ''')
    create_test_file('my_test.input', 'abc')
    Building.emcc('main.cpp', ['--embed-file', 'my_test.input'], output_filename='a.out.js')
    self.assertContained('zyx', run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_abspaths(self):
    # Includes with absolute paths are generally dangerous, things like -I/usr/.. will get to system local headers, not our portable ones.

    shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'main.c')

    for args, expected in [(['-I/usr/something', '-Wwarn-absolute-paths'], True),
                           (['-L/usr/something', '-Wwarn-absolute-paths'], True),
                           (['-I/usr/something'], False),
                           (['-L/usr/something'], False),
                           (['-I/usr/something', '-Wno-warn-absolute-paths'], False),
                           (['-L/usr/something', '-Wno-warn-absolute-paths'], False),
                           (['-Isubdir/something', '-Wwarn-absolute-paths'], False),
                           (['-Lsubdir/something', '-Wwarn-absolute-paths'], False),
                           ([], False)]:
      print(args, expected)
      proc = run_process([PYTHON, EMCC, 'main.c'] + args, stderr=PIPE)
      WARNING = 'encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript)'
      self.assertContainedIf(WARNING, proc.stderr, expected)

  def test_local_link(self):
    # Linking a local library directly, like /usr/lib/libsomething.so, cannot work of course since it
    # doesn't contain bitcode. However, when we see that we should look for a bitcode file for that
    # library in the -L paths and system/lib
    create_test_file('main.cpp', '''
      extern void printey();
      int main() {
        printey();
        return 0;
      }
    ''')

    os.makedirs('subdir')
    open(os.path.join('subdir', 'libfile.so'), 'w').write('this is not llvm bitcode!')

    create_test_file('libfile.cpp', '''
      #include <stdio.h>
      void printey() {
        printf("hello from lib\\n");
      }
    ''')

    run_process([PYTHON, EMCC, 'libfile.cpp', '-o', 'libfile.so'], stderr=PIPE)
    run_process([PYTHON, EMCC, 'main.cpp', os.path.join('subdir', 'libfile.so'), '-L.'])
    self.assertContained('hello from lib', run_js('a.out.js'))

  def test_identical_basenames(self):
    # Issue 287: files in different dirs but with the same basename get confused as the same,
    # causing multiply defined symbol errors
    os.mkdir('foo')
    os.mkdir('bar')
    open(os.path.join('foo', 'main.cpp'), 'w').write('''
      extern void printey();
      int main() {
        printey();
        return 0;
      }
    ''')
    open(os.path.join('bar', 'main.cpp'), 'w').write('''
      #include <stdio.h>
      void printey() { printf("hello there\\n"); }
    ''')

    run_process([PYTHON, EMCC, os.path.join('foo', 'main.cpp'), os.path.join('bar', 'main.cpp')])
    self.assertContained('hello there', run_js('a.out.js'))

    # ditto with first creating .o files
    try_delete('a.out.js')
    run_process([PYTHON, EMCC, os.path.join('foo', 'main.cpp'), '-o', os.path.join('foo', 'main.o')])
    run_process([PYTHON, EMCC, os.path.join('bar', 'main.cpp'), '-o', os.path.join('bar', 'main.o')])
    run_process([PYTHON, EMCC, os.path.join('foo', 'main.o'), os.path.join('bar', 'main.o')])
    self.assertContained('hello there', run_js('a.out.js'))

  def test_main_a(self):
    # if main() is in a .a, we need to pull in that .a

    main_name = 'main.c'
    create_test_file(main_name, r'''
      #include <stdio.h>
      extern int f();
      int main() {
        printf("result: %d.\n", f());
        return 0;
      }
    ''')

    other_name = 'other.c'
    create_test_file(other_name, r'''
      #include <stdio.h>
      int f() { return 12346; }
    ''')

    run_process([PYTHON, EMCC, main_name, '-c', '-o', main_name + '.bc'])
    run_process([PYTHON, EMCC, other_name, '-c', '-o', other_name + '.bc'])

    run_process([PYTHON, EMAR, 'cr', main_name + '.a', main_name + '.bc'])

    run_process([PYTHON, EMCC, other_name + '.bc', main_name + '.a'])

    self.assertContained('result: 12346.', run_js('a.out.js'))

  def test_multiple_archives_duplicate_basenames(self):
    create_test_file('common.c', r'''
      #include <stdio.h>
      void a(void) {
        printf("a\n");
      }
    ''')
    run_process([PYTHON, EMCC, 'common.c', '-c', '-o', 'common.o'])
    try_delete('liba.a')
    run_process([PYTHON, EMAR, 'rc', 'liba.a', 'common.o'])

    create_test_file('common.c', r'''
      #include <stdio.h>
      void b(void) {
        printf("b\n");
      }
    ''')
    run_process([PYTHON, EMCC, 'common.c', '-c', '-o', 'common.o'])
    try_delete('libb.a')
    run_process([PYTHON, EMAR, 'rc', 'libb.a', 'common.o'])

    create_test_file('main.c', r'''
      void a(void);
      void b(void);
      int main() {
        a();
        b();
      }
    ''')

    run_process([PYTHON, EMCC, 'main.c', '-L.', '-la', '-lb'])
    self.assertContained('a\nb\n', run_js('a.out.js'))

  def test_archive_duplicate_basenames(self):
    os.mkdir('a')
    create_test_file(os.path.join('a', 'common.c'), r'''
      #include <stdio.h>
      void a(void) {
        printf("a\n");
      }
    ''')
    run_process([PYTHON, EMCC, os.path.join('a', 'common.c'), '-c', '-o', os.path.join('a', 'common.o')])

    os.mkdir('b')
    create_test_file(os.path.join('b', 'common.c'), r'''
      #include <stdio.h>
      void b(void) {
        printf("b...\n");
      }
    ''')
    run_process([PYTHON, EMCC, os.path.join('b', 'common.c'), '-c', '-o', os.path.join('b', 'common.o')])

    try_delete('liba.a')
    run_process([PYTHON, EMAR, 'rc', 'liba.a', os.path.join('a', 'common.o'), os.path.join('b', 'common.o')])

    # Verify that archive contains basenames with hashes to avoid duplication
    text = run_process([PYTHON, EMAR, 't', 'liba.a'], stdout=PIPE).stdout
    self.assertEqual(text.count('common.o'), 1)
    self.assertContained('common_', text)
    for line in text.split('\n'):
      # should not have huge hash names
      self.assertLess(len(line), 20, line)

    create_test_file('main.c', r'''
      void a(void);
      void b(void);
      int main() {
        a();
        b();
      }
    ''')
    err = run_process([PYTHON, EMCC, 'main.c', '-L.', '-la'], stderr=PIPE).stderr
    self.assertNotIn('archive file contains duplicate entries', err)
    self.assertContained('a\nb...\n', run_js('a.out.js'))

    # Using llvm-ar directly should cause duplicate basenames
    try_delete('libdup.a')
    run_process([LLVM_AR, 'rc', 'libdup.a', os.path.join('a', 'common.o'), os.path.join('b', 'common.o')])
    text = run_process([PYTHON, EMAR, 't', 'libdup.a'], stdout=PIPE).stdout
    assert text.count('common.o') == 2, text

    # With fastcomp we don't support duplicate members so this should generate
    # a warning.  With the wasm backend (lld) this is fully supported.
    cmd = [PYTHON, EMCC, 'main.c', '-L.', '-ldup']
    if self.is_wasm_backend():
      run_process(cmd)
      self.assertContained('a\nb...\n', run_js('a.out.js'))
    else:
      err = self.expect_fail(cmd)
      self.assertIn('libdup.a: archive file contains duplicate entries', err)
      self.assertIn('error: undefined symbol: a', err)
      # others are not duplicates - the hashing keeps them separate
      self.assertEqual(err.count('duplicate: '), 1)
      self.assertContained('a\nb...\n', run_js('a.out.js'))

  def test_export_from_archive(self):
    export_name = 'this_is_an_entry_point'
    full_export_name = '_' + export_name

    # The wasm backend exports symbols without the leading '_'
    if self.is_wasm_backend():
      expect_export = export_name
    else:
      expect_export = full_export_name

    create_test_file('export.c', r'''
      #include <stdio.h>
      void %s(void) {
        printf("Hello, world!\n");
      }
    ''' % export_name)
    run_process([PYTHON, EMCC, 'export.c', '-c', '-o', 'export.o'])
    run_process([PYTHON, EMAR, 'rc', 'libexport.a', 'export.o'])

    create_test_file('main.c', r'''
      int main() {
        return 0;
      }
    ''')

    # Sanity check: the symbol should not be linked in if not requested.
    run_process([PYTHON, EMCC, 'main.c', '-L.', '-lexport'])
    self.assertFalse(self.is_exported_in_wasm(expect_export, 'a.out.wasm'))

    # Sanity check: exporting without a definition does not cause it to appear.
    # Note: exporting main prevents emcc from warning that it generated no code.
    run_process([PYTHON, EMCC, 'main.c', '-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0', '-s', "EXPORTED_FUNCTIONS=['_main', '%s']" % full_export_name])
    self.assertFalse(self.is_exported_in_wasm(expect_export, 'a.out.wasm'))

    # Actual test: defining symbol in library and exporting it causes it to appear in the output.
    run_process([PYTHON, EMCC, 'main.c', '-L.', '-lexport', '-s', "EXPORTED_FUNCTIONS=['%s']" % full_export_name])
    self.assertTrue(self.is_exported_in_wasm(expect_export, 'a.out.wasm'))

  def test_embed_file(self):
    create_test_file('somefile.txt', 'hello from a file with lots of data and stuff in it thank you very much')
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      int main() {
        FILE *f = fopen("somefile.txt", "r");
        char buf[100];
        fread(buf, 1, 20, f);
        buf[20] = 0;
        fclose(f);
        printf("|%s|\n", buf);
        return 0;
      }
    ''')

    run_process([PYTHON, EMCC, 'main.cpp', '--embed-file', 'somefile.txt'])
    self.assertContained('|hello from a file wi|', run_js('a.out.js'))

    # preload twice, should not err
    run_process([PYTHON, EMCC, 'main.cpp', '--embed-file', 'somefile.txt', '--embed-file', 'somefile.txt'])
    self.assertContained('|hello from a file wi|', run_js('a.out.js'))

  def test_embed_file_dup(self):
    try_delete('tst')
    os.mkdir('tst')
    os.mkdir(self.in_dir('tst', 'test1'))
    os.mkdir(self.in_dir('tst', 'test2'))

    open(self.in_dir('tst', 'aa.txt'), 'w').write('''frist''')
    open(self.in_dir('tst', 'test1', 'aa.txt'), 'w').write('''sacond''')
    open(self.in_dir('tst', 'test2', 'aa.txt'), 'w').write('''thard''')
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      #include <string.h>
      void print_file(const char *name) {
        FILE *f = fopen(name, "r");
        char buf[100];
        memset(buf, 0, 100);
        fread(buf, 1, 20, f);
        buf[20] = 0;
        fclose(f);
        printf("|%s|\n", buf);
      }
      int main() {
        print_file("tst/aa.txt");
        print_file("tst/test1/aa.txt");
        print_file("tst/test2/aa.txt");
        return 0;
      }
    ''')

    run_process([PYTHON, EMCC, 'main.cpp', '--embed-file', 'tst'])
    self.assertContained('|frist|\n|sacond|\n|thard|\n', run_js('a.out.js'))

  def test_exclude_file(self):
    try_delete('tst')
    os.mkdir('tst')
    os.mkdir(self.in_dir('tst', 'abc.exe'))
    os.mkdir(self.in_dir('tst', 'abc.txt'))

    open(self.in_dir('tst', 'hello.exe'), 'w').write('''hello''')
    open(self.in_dir('tst', 'hello.txt'), 'w').write('''world''')
    open(self.in_dir('tst', 'abc.exe', 'foo'), 'w').write('''emscripten''')
    open(self.in_dir('tst', 'abc.txt', 'bar'), 'w').write('''!!!''')
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      int main() {
        if(fopen("tst/hello.exe", "rb")) printf("Failed\n");
        if(!fopen("tst/hello.txt", "rb")) printf("Failed\n");
        if(fopen("tst/abc.exe/foo", "rb")) printf("Failed\n");
        if(!fopen("tst/abc.txt/bar", "rb")) printf("Failed\n");

        return 0;
      }
    ''')

    run_process([PYTHON, EMCC, 'main.cpp', '--embed-file', 'tst', '--exclude-file', '*.exe'])
    output = run_js('a.out.js')
    assert output == '' or output == ' \n'

  def test_multidynamic_link(self):
    # Linking the same dynamic library in statically will error, normally, since we statically link it, causing dupe symbols

    def test(link_cmd, lib_suffix=''):
      print(link_cmd, lib_suffix)

      self.clear()
      os.mkdir('libdir')

      create_test_file('main.cpp', r'''
        #include <stdio.h>
        extern void printey();
        extern void printother();
        int main() {
          printf("*");
          printey();
          printf("\n");
          printother();
          printf("\n");
          printf("*");
          return 0;
        }
      ''')

      open(os.path.join('libdir', 'libfile.cpp'), 'w').write('''
        #include <stdio.h>
        void printey() {
          printf("hello from lib");
        }
      ''')

      open(os.path.join('libdir', 'libother.cpp'), 'w').write('''
        #include <stdio.h>
        extern void printey();
        void printother() {
          printf("|");
          printey();
          printf("|");
        }
      ''')

      compiler = [PYTHON, EMCC]

      # Build libfile normally into an .so
      run_process(compiler + [os.path.join('libdir', 'libfile.cpp'), '-o', os.path.join('libdir', 'libfile.so' + lib_suffix)])
      # Build libother and dynamically link it to libfile
      run_process(compiler + [os.path.join('libdir', 'libother.cpp')] + link_cmd + ['-o', os.path.join('libdir', 'libother.so')])
      # Build the main file, linking in both the libs
      run_process(compiler + [os.path.join('main.cpp')] + link_cmd + ['-lother', '-c'])
      print('...')
      # The normal build system is over. We need to do an additional step to link in the dynamic libraries, since we ignored them before
      run_process([PYTHON, EMCC, 'main.o'] + link_cmd + ['-lother', '-s', 'EXIT_RUNTIME=1'])

      self.assertContained('*hello from lib\n|hello from lib|\n*', run_js('a.out.js'))

    test(['-L' + 'libdir', '-lfile']) # -l, auto detection from library path
    test(['-L' + 'libdir', self.in_dir('libdir', 'libfile.so.3.1.4.1.5.9')], '.3.1.4.1.5.9') # handle libX.so.1.2.3 as well

  def test_js_link(self):
    create_test_file('main.cpp', '''
      #include <stdio.h>
      int main() {
        printf("hello from main\\n");
        return 0;
      }
    ''')
    create_test_file('before.js', '''
      var MESSAGE = 'hello from js';
      // Module is initialized with empty object by default, so if there are no keys - nothing was run yet
      if (Object.keys(Module).length) throw 'This code should run before anything else!';
    ''')
    create_test_file('after.js', '''
      out(MESSAGE);
    ''')

    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'before.js', '--post-js', 'after.js', '-s', 'WASM_ASYNC_COMPILATION=0'])
    self.assertContained('hello from main\nhello from js\n', run_js('a.out.js'))

  def test_sdl_endianness(self):
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      #include <SDL/SDL.h>

      int main() {
        printf("%d, %d, %d\n", SDL_BYTEORDER, SDL_LIL_ENDIAN, SDL_BIG_ENDIAN);
        return 0;
      }
    ''')
    run_process([PYTHON, EMCC, 'main.cpp'])
    self.assertContained('1234, 1234, 4321\n', run_js('a.out.js'))

  def test_libpng(self):
    shutil.copyfile(path_from_root('tests', 'pngtest.png'), 'pngtest.png')
    Building.emcc(path_from_root('tests', 'pngtest.c'), ['--embed-file', 'pngtest.png', '-s', 'USE_ZLIB=1', '-s', 'USE_LIBPNG=1'], output_filename='a.out.js')
    self.assertContained('TESTS PASSED', run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_libjpeg(self):
    shutil.copyfile(path_from_root('tests', 'screenshot.jpg'), 'screenshot.jpg')
    Building.emcc(path_from_root('tests', 'jpeg_test.c'), ['--embed-file', 'screenshot.jpg', '-s', 'USE_LIBJPEG=1'], output_filename='a.out.js')
    self.assertContained('Image is 600 by 450 with 3 components', run_process(JS_ENGINES[0] + ['a.out.js', 'screenshot.jpg'], stdout=PIPE, stderr=PIPE).stdout)

  def test_bullet(self):
    Building.emcc(path_from_root('tests', 'bullet_hello_world.cpp'), ['-s', 'USE_BULLET=1'], output_filename='a.out.js')
    self.assertContained('BULLET RUNNING', run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_vorbis(self):
    # This will also test if ogg compiles, because vorbis depends on ogg
    Building.emcc(path_from_root('tests', 'vorbis_test.c'), ['-s', 'USE_VORBIS=1'], output_filename='a.out.js')
    self.assertContained('ALL OK', run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_bzip2(self):
    Building.emcc(path_from_root('tests', 'bzip2_test.c'), ['-s', 'USE_BZIP2=1'], output_filename='a.out.js')
    self.assertContained("usage: unzcrash filename", run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_freetype(self):
    # copy the Liberation Sans Bold truetype file located in the
    # <emscripten_root>/tests/freetype to the compilation folder
    shutil.copy2(path_from_root('tests/freetype', 'LiberationSansBold.ttf'), os.getcwd())
    # build test program with the font file embed in it
    Building.emcc(path_from_root('tests', 'freetype_test.c'), ['-s', 'USE_FREETYPE=1', '--embed-file', 'LiberationSansBold.ttf'], output_filename='a.out.js')
    # the test program will print an ascii representation of a bitmap where the
    # 'w' character has been rendered using the Liberation Sans Bold font
    expectedOutput = '***   +***+   **\n' + \
                     '***+  +***+  +**\n' + \
                     '***+  *****  +**\n' + \
                     '+**+ +**+**+ +**\n' + \
                     '+*** +**+**+ ***\n' + \
                     ' *** +** **+ ***\n' + \
                     ' ***+**+ +**+**+\n' + \
                     ' +**+**+ +**+**+\n' + \
                     ' +*****  +*****+\n' + \
                     '  *****   ***** \n' + \
                     '  ****+   +***+ \n' + \
                     '  +***+   +***+ \n'
    self.assertContained(expectedOutput, run_process(JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)

  def test_link_memcpy(self):
    # memcpy can show up *after* optimizations, so after our opportunity to link in libc, so it must be special-cased
    create_test_file('main.cpp', r'''
      #include <stdio.h>

      int main(int argc, char **argv) {
        int num = argc + 10;
        char buf[num], buf2[num];
        for (int i = 0; i < num; i++) {
          buf[i] = i*i+i/3;
        }
        for (int i = 1; i < num; i++) {
          buf[i] += buf[i-1];
        }
        for (int i = 0; i < num; i++) {
          buf2[i] = buf[i];
        }
        for (int i = 1; i < num; i++) {
          buf2[i] += buf2[i-1];
        }
        for (int i = 0; i < num; i++) {
          printf("%d:%d\n", i, buf2[i]);
        }
        return 0;
      }
    ''')
    run_process([PYTHON, EMCC, '-O2', 'main.cpp'])
    output = run_js('a.out.js', full_output=True, stderr=PIPE)
    self.assertContained('''0:0
1:1
2:6
3:21
4:53
5:111
6:-49
7:98
8:55
9:96
10:-16
''', output)
    self.assertNotContained('warning: library.js memcpy should not be running, it is only for testing!', output)

  def test_undefined_function(self):
    cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp')]
    run_process(cmd)

    # adding a missing symbol to EXPORTED_FUNCTIONS should cause failure
    cmd += ['-s', "EXPORTED_FUNCTIONS=['foobar']"]
    err = self.expect_fail(cmd)
    self.assertContained('undefined exported function: "foobar"', err)

    # setting ERROR_ON_UNDEFINED_SYMBOLS=0 suppresses error
    cmd += ['-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0']
    run_process(cmd)

  def test_undefined_symbols(self):
    create_test_file('main.cpp', r'''
      #include <stdio.h>
      #include <SDL.h>
      #include "SDL/SDL_opengl.h"

      extern "C" {
        void something();
        void elsey();
      }

      int main() {
        printf("%p", SDL_GL_GetProcAddress("glGenTextures")); // pull in gl proc stuff, avoid warnings on emulation funcs
        something();
        elsey();
        return 0;
      }
      ''')

    for args in ([], ['-O2']):
      for action in ('WARN', 'ERROR', None):
        for value in ([0, 1]):
          try_delete('a.out.js')
          print('checking "%s" %s=%s' % (args, action, value))
          extra = ['-s', action + '_ON_UNDEFINED_SYMBOLS=%d' % value] if action else []
          proc = run_process([PYTHON, EMCC, 'main.cpp'] + extra + args, stderr=PIPE, check=False)
          print(proc.stderr)
          if value or action is None:
            # The default is that we error in undefined symbols
            self.assertContained('error: undefined symbol: something', proc.stderr)
            self.assertContained('error: undefined symbol: elsey', proc.stderr)
            check_success = False
          elif action == 'ERROR' and not value:
            # Error disables, should only warn
            self.assertContained('warning: undefined symbol: something', proc.stderr)
            self.assertContained('warning: undefined symbol: elsey', proc.stderr)
            self.assertNotContained('undefined symbol: emscripten_', proc.stderr)
            check_success = True
          elif action == 'WARN' and not value:
            # Disabled warning should imply disabling errors
            self.assertNotContained('undefined symbol', proc.stderr)
            check_success = True

          if check_success:
            self.assertEqual(proc.returncode, 0)
            self.assertTrue(os.path.exists('a.out.js'))
          else:
            self.assertNotEqual(proc.returncode, 0)
            self.assertFalse(os.path.exists('a.out.js'))

  def test_GetProcAddress_LEGACY_GL_EMULATION(self):
    # without legacy gl emulation, getting a proc from there should fail
    self.do_other_test(os.path.join('other', 'GetProcAddress_LEGACY_GL_EMULATION'), run_args=['0'], emcc_args=['-s', 'LEGACY_GL_EMULATION=0'])
    # with it, it should work
    self.do_other_test(os.path.join('other', 'GetProcAddress_LEGACY_GL_EMULATION'), run_args=['1'], emcc_args=['-s', 'LEGACY_GL_EMULATION=1'])

  def test_prepost(self):
    create_test_file('main.cpp', '''
      #include <stdio.h>
      int main() {
        printf("hello from main\\n");
        return 0;
      }
      ''')
    create_test_file('pre.js', '''
      var Module = {
        preRun: function() { out('pre-run') },
        postRun: function() { out('post-run') }
      };
      ''')

    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'pre.js', '-s', 'WASM_ASYNC_COMPILATION=0'])
    self.assertContained('pre-run\nhello from main\npost-run\n', run_js('a.out.js'))

    # addRunDependency during preRun should prevent main, and post-run from
    # running.
    with open('pre.js', 'a') as f:
      f.write('Module.preRun = function() { out("add-dep"); addRunDependency(); }\n')
    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'pre.js', '-s', 'WASM_ASYNC_COMPILATION=0'])
    output = run_js('a.out.js')
    self.assertContained('add-dep\n', output)
    self.assertNotContained('hello from main\n', output)
    self.assertNotContained('post-run\n', output)

    # noInitialRun prevents run
    for no_initial_run, run_dep in [(0, 0), (1, 0), (0, 1)]:
      print(no_initial_run, run_dep)
      args = ['-s', 'WASM_ASYNC_COMPILATION=0', '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["callMain"]']
      if no_initial_run:
        args += ['-s', 'INVOKE_RUN=0']
      if run_dep:
        create_test_file('pre.js', 'Module.preRun = function() { addRunDependency("test"); }')
        create_test_file('post.js', 'removeRunDependency("test");')
        args += ['--pre-js', 'pre.js', '--post-js', 'post.js']

      run_process([PYTHON, EMCC, 'main.cpp'] + args)
      output = run_js('a.out.js')
      self.assertContainedIf('hello from main', output, not no_initial_run)

      if no_initial_run:
        # Calling main later should still work, filesystem etc. must be set up.
        print('call main later')
        src = open('a.out.js').read()
        src += '\nModule.callMain();\n'
        create_test_file('a.out.js', src)
        self.assertContained('hello from main', run_js('a.out.js'))

    # Use postInit
    create_test_file('pre.js', '''
      var Module = {
        preRun: function() { out('pre-run') },
        postRun: function() { out('post-run') },
        preInit: function() { out('pre-init') }
      };
    ''')
    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'pre.js'])
    self.assertContained('pre-init\npre-run\nhello from main\npost-run\n', run_js('a.out.js'))

  def test_prepost2(self):
    create_test_file('main.cpp', '''
      #include <stdio.h>
      int main() {
        printf("hello from main\\n");
        return 0;
      }
    ''')
    create_test_file('pre.js', '''
      var Module = {
        preRun: function() { out('pre-run') },
      };
    ''')
    create_test_file('pre2.js', '''
      Module.postRun = function() { out('post-run') };
    ''')
    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'pre.js', '--pre-js', 'pre2.js'])
    self.assertContained('pre-run\nhello from main\npost-run\n', run_js('a.out.js'))

  def test_prepre(self):
    create_test_file('main.cpp', '''
      #include <stdio.h>
      int main() {
        printf("hello from main\\n");
        return 0;
      }
    ''')
    create_test_file('pre.js', '''
      var Module = {
        preRun: [function() { out('pre-run') }],
      };
    ''')
    create_test_file('pre2.js', '''
      Module.preRun.push(function() { out('prepre') });
    ''')
    run_process([PYTHON, EMCC, 'main.cpp', '--pre-js', 'pre.js', '--pre-js', 'pre2.js'])
    self.assertContained('prepre\npre-run\nhello from main\n', run_js('a.out.js'))

  @no_wasm_backend('depends on bc output')
  def test_save_bc(self):
    for save in [0, 1]:
      self.clear()
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world_loop_malloc.cpp')]
      if save:
        cmd += ['--save-bc', 'my_bitcode.bc']
      run_process(cmd)
      assert 'hello, world!' in run_js('a.out.js')
      if save:
        self.assertExists('my_bitcode.bc')
      else:
        self.assertNotExists('my_bitcode.bc')
      if save:
        try_delete('a.out.js')
        Building.llvm_dis('my_bitcode.bc', 'my_ll.ll')
        with env_modify({'EMCC_LEAVE_INPUTS_RAW': '1'}):
          run_process([PYTHON, EMCC, 'my_ll.ll', '-o', 'two.js'])
          assert 'hello, world!' in run_js('two.js')

  def test_js_optimizer(self):
    ACORN_PASSES = ['JSDCE', 'AJSDCE', 'applyImportAndExportNameChanges', 'emitDCEGraph', 'applyDCEGraphRemovals']
    for input, expected, passes in [

      (path_from_root('tests', 'optimizer', 'eliminateDeadGlobals.js'), open(path_from_root('tests', 'optimizer', 'eliminateDeadGlobals-output.js')).read(),
       ['eliminateDeadGlobals']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-output.js')).read(),
       ['hoistMultiples', 'removeAssignsToUndefined', 'simplifyExpressions']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-output.js')).read(),
       ['asm', 'simplifyExpressions']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-si.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-si-output.js')).read(),
       ['simplifyIfs']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-regs.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-regs-output.js')).read(),
       ['registerize']),
      (path_from_root('tests', 'optimizer', 'eliminator-test.js'), open(path_from_root('tests', 'optimizer', 'eliminator-test-output.js')).read(),
       ['eliminate']),
      (path_from_root('tests', 'optimizer', 'safe-eliminator-test.js'), open(path_from_root('tests', 'optimizer', 'safe-eliminator-test-output.js')).read(),
       ['eliminateMemSafe']),
      (path_from_root('tests', 'optimizer', 'asm-eliminator-test.js'), open(path_from_root('tests', 'optimizer', 'asm-eliminator-test-output.js')).read(),
       ['asm', 'eliminate']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-output.js')).read(),
       ['asm', 'registerize']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-harder.js'), [open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-harder-output.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-harder-output2.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-harder-output3.js')).read()],
       ['asm', 'registerizeHarder']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-min.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-regs-min-output.js')).read(),
       ['asm', 'registerize', 'minifyLocals']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre.js'), [open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-output.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-output2.js')).read()],
       ['asm', 'simplifyExpressions']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-f32.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-output-f32.js')).read(),
       ['asm', 'asmPreciseF32', 'simplifyExpressions', 'optimizeFrounds']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-f32.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-pre-output-f32-nosimp.js')).read(),
       ['asm', 'asmPreciseF32', 'optimizeFrounds']),
      (path_from_root('tests', 'optimizer', 'test-reduce-dead-float-return.js'), open(path_from_root('tests', 'optimizer', 'test-reduce-dead-float-return-output.js')).read(),
       ['asm', 'optimizeFrounds', 'registerizeHarder']),
      (path_from_root('tests', 'optimizer', 'test-no-reduce-dead-float-return-to-nothing.js'), open(path_from_root('tests', 'optimizer', 'test-no-reduce-dead-float-return-to-nothing-output.js')).read(),
       ['asm', 'registerizeHarder']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-last.js'), [open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-lastOpts-output.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-lastOpts-output2.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-lastOpts-output3.js')).read()],
       ['asm', 'asmLastOpts']),
      (path_from_root('tests', 'optimizer', 'asmLastOpts.js'), open(path_from_root('tests', 'optimizer', 'asmLastOpts-output.js')).read(),
       ['asm', 'asmLastOpts']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-last.js'), [open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-last-output.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-last-output2.js')).read(), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-last-output3.js')).read()],
       ['asm', 'asmLastOpts', 'last']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-relocate.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-relocate-output.js')).read(),
       ['asm', 'relocate']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-minlast.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-asm-minlast-output.js')).read(),
       ['asm', 'minifyWhitespace', 'asmLastOpts', 'last']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-shiftsAggressive.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-shiftsAggressive-output.js')).read(),
       ['asm', 'aggressiveVariableElimination']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-localCSE.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-localCSE-output.js')).read(),
       ['asm', 'localCSE']),
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-ensureLabelSet.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-ensureLabelSet-output.js')).read(),
       ['asm', 'ensureLabelSet']),
      (path_from_root('tests', 'optimizer', '3154.js'), open(path_from_root('tests', 'optimizer', '3154-output.js')).read(),
       ['asm', 'eliminate', 'registerize', 'asmLastOpts', 'last']),
      (path_from_root('tests', 'optimizer', 'simd.js'), open(path_from_root('tests', 'optimizer', 'simd-output.js')).read(),
       ['asm', 'eliminate']), # eliminate, just enough to trigger asm normalization/denormalization
      (path_from_root('tests', 'optimizer', 'simd.js'), open(path_from_root('tests', 'optimizer', 'simd-output-memSafe.js')).read(),
       ['asm', 'eliminateMemSafe']),
      (path_from_root('tests', 'optimizer', 'safeLabelSetting.js'), open(path_from_root('tests', 'optimizer', 'safeLabelSetting-output.js')).read(),
       ['asm', 'safeLabelSetting']), # eliminate, just enough to trigger asm normalization/denormalization
      (path_from_root('tests', 'optimizer', 'null_if.js'), [open(path_from_root('tests', 'optimizer', 'null_if-output.js')).read(), open(path_from_root('tests', 'optimizer', 'null_if-output2.js')).read()],
       ['asm', 'registerizeHarder', 'asmLastOpts', 'minifyWhitespace']), # issue 3520
      (path_from_root('tests', 'optimizer', 'null_else.js'), [open(path_from_root('tests', 'optimizer', 'null_else-output.js')).read(), open(path_from_root('tests', 'optimizer', 'null_else-output2.js')).read()],
       ['asm', 'registerizeHarder', 'asmLastOpts', 'minifyWhitespace']), # issue 3549
      (path_from_root('tests', 'optimizer', 'test-js-optimizer-splitMemory.js'), open(path_from_root('tests', 'optimizer', 'test-js-optimizer-splitMemory-output.js')).read(),
       ['splitMemory']),
      (path_from_root('tests', 'optimizer', 'JSDCE.js'), open(path_from_root('tests', 'optimizer', 'JSDCE-output.js')).read(),
       ['JSDCE']),
      (path_from_root('tests', 'optimizer', 'JSDCE-hasOwnProperty.js'), open(path_from_root('tests', 'optimizer', 'JSDCE-hasOwnProperty-output.js')).read(),
       ['JSDCE']),
      (path_from_root('tests', 'optimizer', 'JSDCE-fors.js'), open(path_from_root('tests', 'optimizer', 'JSDCE-fors-output.js')).read(),
       ['JSDCE']),
      (path_from_root('tests', 'optimizer', 'AJSDCE.js'), open(path_from_root('tests', 'optimizer', 'AJSDCE-output.js')).read(),
       ['AJSDCE']),
      (path_from_root('tests', 'optimizer', 'emitDCEGraph.js'), open(path_from_root('tests', 'optimizer', 'emitDCEGraph-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'emitDCEGraph2.js'), open(path_from_root('tests', 'optimizer', 'emitDCEGraph2-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'emitDCEGraph3.js'), open(path_from_root('tests', 'optimizer', 'emitDCEGraph3-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'emitDCEGraph4.js'), open(path_from_root('tests', 'optimizer', 'emitDCEGraph4-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'emitDCEGraph5.js'), open(path_from_root('tests', 'optimizer', 'emitDCEGraph5-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'applyDCEGraphRemovals.js'), open(path_from_root('tests', 'optimizer', 'applyDCEGraphRemovals-output.js')).read(),
       ['applyDCEGraphRemovals']),
      (path_from_root('tests', 'optimizer', 'applyImportAndExportNameChanges.js'), open(path_from_root('tests', 'optimizer', 'applyImportAndExportNameChanges-output.js')).read(),
       ['applyImportAndExportNameChanges']),
      (path_from_root('tests', 'optimizer', 'applyImportAndExportNameChanges2.js'), open(path_from_root('tests', 'optimizer', 'applyImportAndExportNameChanges2-output.js')).read(),
       ['applyImportAndExportNameChanges']),
      (path_from_root('tests', 'optimizer', 'detectSign-modulus-emterpretify.js'), open(path_from_root('tests', 'optimizer', 'detectSign-modulus-emterpretify-output.js')).read(),
       ['noPrintMetadata', 'emterpretify', 'noEmitAst']),
      (path_from_root('tests', 'optimizer', 'minimal-runtime-emitDCEGraph.js'), open(path_from_root('tests', 'optimizer', 'minimal-runtime-emitDCEGraph-output.js')).read(),
       ['emitDCEGraph', 'noPrint']),
      (path_from_root('tests', 'optimizer', 'emittedJSPreservesParens.js'), open(path_from_root('tests', 'optimizer', 'emittedJSPreservesParens-output.js')).read(),
       ['asm']),
    ]:
      print(input, passes)

      if not isinstance(expected, list):
        expected = [expected]
      expected = [out.replace('\n\n', '\n').replace('\n\n', '\n') for out in expected]

      acorn = any([p for p in passes if p in ACORN_PASSES])

      # test calling optimizer
      if not acorn:
        print('  js')
        output = run_process(NODE_JS + [path_from_root('tools', 'js-optimizer.js'), input] + passes, stdin=PIPE, stdout=PIPE).stdout
      else:
        print('  acorn')
        output = run_process(NODE_JS + [path_from_root('tools', 'acorn-optimizer.js'), input] + passes, stdin=PIPE, stdout=PIPE).stdout

      def check_js(js, expected):
        # print >> sys.stderr, 'chak\n==========================\n', js, '\n===========================\n'
        if 'registerizeHarder' in passes:
          # registerizeHarder is hard to test, as names vary by chance, nondeterminstically FIXME
          def fix(src):
            if type(src) is list:
              return list(map(fix, src))
            src = '\n'.join([line for line in src.split('\n') if 'var ' not in line]) # ignore vars

            def reorder(func):
              def swap(func, stuff):
                # emit EYE_ONE always before EYE_TWO, replacing i1,i2 or i2,i1 etc
                for i in stuff:
                  if i not in func:
                    return func
                indexes = [[i, func.index(i)] for i in stuff]
                indexes.sort(key=lambda x: x[1])
                for j in range(len(indexes)):
                  func = func.replace(indexes[j][0], 'STD_' + str(j))
                return func
              func = swap(func, ['i1', 'i2', 'i3'])
              func = swap(func, ['i1', 'i2'])
              func = swap(func, ['i4', 'i5'])
              return func

            src = 'function '.join(map(reorder, src.split('function ')))
            return src
          js = fix(js)
          expected = fix(expected)
        self.assertIdentical(expected, js.replace('\r\n', '\n').replace('\n\n', '\n').replace('\n\n', '\n'))

      if input not in [ # blacklist of tests that are native-optimizer only
        path_from_root('tests', 'optimizer', 'asmLastOpts.js'),
        path_from_root('tests', 'optimizer', '3154.js')
      ]:
        check_js(output, expected)
      else:
        print('(skip non-native)')

      if not self.is_wasm_backend() and tools.js_optimizer.use_native(passes) and tools.js_optimizer.get_native_optimizer():
        # test calling native
        def check_json():
          run_process(listify(NODE_JS) + [path_from_root('tools', 'js-optimizer.js'), output_temp, 'receiveJSON'], stdin=PIPE, stdout=open(output_temp + '.js', 'w'))
          output = open(output_temp + '.js').read()
          check_js(output, expected)

        self.clear()
        input_temp = 'temp.js'
        output_temp = 'output.js'
        shutil.copyfile(input, input_temp)
        run_process(listify(NODE_JS) + [path_from_root('tools', 'js-optimizer.js'), input_temp, 'emitJSON'], stdin=PIPE, stdout=open(input_temp + '.js', 'w'))
        original = open(input).read()
        if '// EXTRA_INFO:' in original:
          json = open(input_temp + '.js').read()
          json += '\n' + original[original.find('// EXTRA_INFO:'):]
          create_test_file(input_temp + '.js', json)

        # last is only relevant when we emit JS
        if 'last' not in passes and \
           'null_if' not in input and 'null_else' not in input:  # null-* tests are js optimizer or native, not a mixture (they mix badly)
          print('  native (receiveJSON)')
          output = run_process([tools.js_optimizer.get_native_optimizer(), input_temp + '.js'] + passes + ['receiveJSON', 'emitJSON'], stdin=PIPE, stdout=open(output_temp, 'w')).stdout
          check_json()

          print('  native (parsing JS)')
          output = run_process([tools.js_optimizer.get_native_optimizer(), input] + passes + ['emitJSON'], stdin=PIPE, stdout=open(output_temp, 'w')).stdout
          check_json()

        print('  native (emitting JS)')
        output = run_process([tools.js_optimizer.get_native_optimizer(), input] + passes, stdin=PIPE, stdout=PIPE).stdout
        check_js(output, expected)

  def test_m_mm(self):
    create_test_file('foo.c', '''#include <emscripten.h>''')
    for opt in ['M', 'MM']:
      proc = run_process([PYTHON, EMCC, 'foo.c', '-' + opt], stdout=PIPE, stderr=PIPE)
      assert 'foo.o: ' in proc.stdout, '-%s failed to produce the right output: %s' % (opt, proc.stdout)
      assert 'error' not in proc.stderr, 'Unexpected stderr: ' + proc.stderr

  @uses_canonical_tmp
  def test_emcc_debug_files(self):
    for opts in [0, 1, 2, 3]:
      for debug in [None, '1', '2']:
        print(opts, debug)
        if os.path.exists(self.canonical_temp_dir):
          shutil.rmtree(self.canonical_temp_dir)

        env = os.environ.copy()
        if debug is None:
          env.pop('EMCC_DEBUG', None)
        else:
          env['EMCC_DEBUG'] = debug
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-O' + str(opts)], stderr=PIPE, env=env)
        if debug is None:
          self.assertFalse(os.path.exists(self.canonical_temp_dir))
        elif debug == '1':
          if self.is_wasm_backend():
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-0-original.js'))
          else:
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-0-linktime.bc'))
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-1-original.js'))
        elif debug == '2':
          if self.is_wasm_backend():
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-0-original.js'))
          else:
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-0-basebc.bc'))
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-1-linktime.bc'))
            self.assertExists(os.path.join(self.canonical_temp_dir, 'emcc-2-original.js'))

  def test_debuginfo(self):
    for args, expect_debug in [
        (['-O0'], False),
        (['-O0', '-g'], True),
        (['-O0', '-g4'], True),
        (['-O1'], False),
        (['-O1', '-g'], True),
        (['-O2'], False),
        (['-O2', '-g'], True),
      ]:
      print(args, expect_debug)
      err = run_process([PYTHON, EMCC, '-v', path_from_root('tests', 'hello_world.cpp')] + args, stdout=PIPE, stderr=PIPE).stderr
      lines = err.splitlines()
      if self.is_wasm_backend():
        finalize = [l for l in lines if 'wasm-emscripten-finalize' in l][0]
        if expect_debug:
          self.assertIn(' -g ', finalize)
        else:
          self.assertNotIn(' -g ', finalize)
      else:
        if expect_debug:
          self.assertNotIn('strip-debug', err)
        else:
          self.assertIn('strip-debug', err)

  @unittest.skipIf(not scons_path, 'scons not found in PATH')
  @with_env_modify({'EMSCRIPTEN_ROOT': path_from_root()})
  def test_scons(self):
    # this test copies the site_scons directory alongside the test
    shutil.copytree(path_from_root('tests', 'scons'), 'test')
    shutil.copytree(path_from_root('tools', 'scons', 'site_scons'), os.path.join('test', 'site_scons'))
    with chdir('test'):
      run_process(['scons'])
      output = run_js('scons_integration.js', assert_returncode=5)
    self.assertContained('If you see this - the world is all right!', output)

  @unittest.skipIf(not scons_path, 'scons not found in PATH')
  @with_env_modify({'EMSCRIPTEN_TOOLPATH': path_from_root('tools', 'scons', 'site_scons'),
                    'EMSCRIPTEN_ROOT': path_from_root()})
  def test_emscons(self):
    # uses the emscons wrapper which requires EMSCRIPTEN_TOOLPATH to find
    # site_scons
    shutil.copytree(path_from_root('tests', 'scons'), 'test')
    with chdir('test'):
      run_process([path_from_root('emscons'), 'scons'])
      output = run_js('scons_integration.js', assert_returncode=5)
    self.assertContained('If you see this - the world is all right!', output)

  def test_embind(self):
    environ = os.environ.copy()
    environ['EMCC_CLOSURE_ARGS'] = environ.get('EMCC_CLOSURE_ARGS', '') + " --externs " + pipes.quote(path_from_root('tests', 'embind', 'underscore-externs.js'))
    test_cases = [
        ([], True), # without --bind, we fail
        (['--bind'], False),
        (['--bind', '-O1'], False),
        (['--bind', '-O2'], False),
        (['--bind', '-O2', '-s', 'ALLOW_MEMORY_GROWTH=1', path_from_root('tests', 'embind', 'isMemoryGrowthEnabled=true.cpp')], False),
    ]
    without_utf8_args = ['-s', 'EMBIND_STD_STRING_IS_UTF8=0']
    test_cases_without_utf8 = []
    for args, fail in test_cases:
        test_cases_without_utf8.append((args + without_utf8_args, fail))
    test_cases += test_cases_without_utf8
    test_cases.extend([(args[:] + ['-s', 'DYNAMIC_EXECUTION=0'], status) for args, status in test_cases])
    test_cases.append((['--bind', '-O2', '--closure', '1'], False)) # closure compiler doesn't work with DYNAMIC_EXECUTION=0
    test_cases = [(args + ['-s', 'IN_TEST_HARNESS=1'], status) for args, status in test_cases]

    for args, fail in test_cases:
      print(args, fail)
      self.clear()
      try_delete('a.out.js')

      testFiles = [
        path_from_root('tests', 'embind', 'underscore-1.4.2.js'),
        path_from_root('tests', 'embind', 'imvu_test_adapter.js'),
        path_from_root('tests', 'embind', 'embind.test.js'),
      ]

      proc = run_process(
        [PYTHON, EMCC, path_from_root('tests', 'embind', 'embind_test.cpp'),
         '--pre-js', path_from_root('tests', 'embind', 'test.pre.js'),
         '--post-js', path_from_root('tests', 'embind', 'test.post.js'),
         '-s', 'WASM_ASYNC_COMPILATION=0'] + args,
        stderr=PIPE if fail else None,
        check=not fail,
        env=environ)

      if fail:
        self.assertNotEqual(proc.returncode, 0)
      else:
        if 'DYNAMIC_EXECUTION=0' in args:
          with open('a.out.js') as js_binary_file:
            js_binary_str = js_binary_file.read()
            self.assertNotIn('new Function(', js_binary_str, 'Found "new Function(" with DYNAMIC_EXECUTION=0')
            self.assertNotIn('eval(', js_binary_str, 'Found "eval(" with DYNAMIC_EXECUTION=0')

        with open('a.out.js', 'ab') as f:
          for tf in testFiles:
            f.write(open(tf, 'rb').read())

        output = run_js('a.out.js', stdout=PIPE, stderr=PIPE, full_output=True, engine=NODE_JS)
        assert "FAIL" not in output, output

  def test_emconfig(self):
    output = run_process([PYTHON, EMCONFIG, 'LLVM_ROOT'], stdout=PIPE).stdout.strip()
    self.assertEqual(output, LLVM_ROOT)
    invalid = 'Usage: em-config VAR_NAME'
    # Don't accept variables that do not exist
    output = self.expect_fail([PYTHON, EMCONFIG, 'VAR_WHICH_DOES_NOT_EXIST']).strip()
    self.assertEqual(output, invalid)
    # Don't accept no arguments
    output = self.expect_fail([PYTHON, EMCONFIG]).strip()
    self.assertEqual(output, invalid)
    # Don't accept more than one variable
    output = self.expect_fail([PYTHON, EMCONFIG, 'LLVM_ROOT', 'EMCC']).strip()
    self.assertEqual(output, invalid)
    # Don't accept arbitrary python code
    output = self.expect_fail([PYTHON, EMCONFIG, 'sys.argv[1]']).strip()
    self.assertEqual(output, invalid)

  def test_link_s(self):
    # -s OPT=VALUE can conflict with -s as a linker option. We warn and ignore
    create_test_file('main.cpp', r'''
      extern "C" {
        void something();
      }

      int main() {
        something();
        return 0;
      }
    ''')
    create_test_file('supp.cpp', r'''
      #include <stdio.h>

      extern "C" {
        void something() {
          printf("yello\n");
        }
      }
    ''')
    run_process([PYTHON, EMCC, 'main.cpp', '-o', 'main.o'])
    run_process([PYTHON, EMCC, 'supp.cpp', '-o', 'supp.o'])

    run_process([PYTHON, EMCC, 'main.o', '-s', 'supp.o', '-s', 'SAFE_HEAP=1'])
    self.assertContained('yello', run_js('a.out.js'))
    # Check that valid -s option had an effect'
    self.assertContained('SAFE_HEAP', open('a.out.js').read())

  def test_conftest_s_flag_passing(self):
    create_test_file('conftest.c', r'''
      int main() {
        return 0;
      }
    ''')
    with env_modify({'EMMAKEN_JUST_CONFIGURE': '1'}):
      cmd = [PYTHON, EMCC, '-s', 'ASSERTIONS=1', 'conftest.c', '-o', 'conftest']
    output = run_process(cmd, stderr=PIPE)
    self.assertNotContained('emcc: warning: treating -s as linker option', output.stderr)
    self.assertExists('conftest')

  def test_file_packager(self):
    os.mkdir('subdir')
    create_test_file('data1.txt', 'data1')

    os.chdir('subdir')
    create_test_file('data2.txt', 'data2')

    # relative path to below the current dir is invalid
    stderr = self.expect_fail([PYTHON, FILE_PACKAGER, 'test.data', '--preload', '../data1.txt'])
    self.assertContained('below the current directory', stderr)

    # relative path that ends up under us is cool
    proc = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', '../subdir/data2.txt'], stderr=PIPE, stdout=PIPE)
    self.assertGreater(len(proc.stdout), 0)
    self.assertNotContained('below the current directory', proc.stderr)

    # direct path leads to the same code being generated - relative path does not make us do anything different
    proc2 = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'data2.txt'], stderr=PIPE, stdout=PIPE)
    self.assertGreater(len(proc2.stdout), 0)
    self.assertNotContained('below the current directory', proc2.stderr)

    def clean(txt):
      return [line for line in txt.split('\n') if 'PACKAGE_UUID' not in line and 'loadPackage({' not in line]

    assert clean(proc.stdout) == clean(proc2.stdout)

    # verify '--separate-metadata' option produces separate metadata file
    os.chdir('..')

    run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'data1.txt', '--preload', 'subdir/data2.txt', '--js-output=immutable.js', '--separate-metadata'])
    assert os.path.isfile('immutable.js.metadata')
    # verify js output file is immutable when metadata is separated
    shutil.copy2('immutable.js', 'immutable.js.copy') # copy with timestamp preserved
    run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'data1.txt', '--preload', 'subdir/data2.txt', '--js-output=immutable.js', '--separate-metadata'])
    assert filecmp.cmp('immutable.js.copy', 'immutable.js')
    # assert both file content and timestamp are the same as reference copy
    self.assertEqual(str(os.path.getmtime('immutable.js.copy')), str(os.path.getmtime('immutable.js')))
    # verify the content of metadata file is correct
    with open('immutable.js.metadata') as f:
      metadata = json.load(f)
    self.assertEqual(len(metadata['files']), 2)
    assert metadata['files'][0]['start'] == 0 and metadata['files'][0]['end'] == len('data1') and metadata['files'][0]['filename'] == '/data1.txt'
    assert metadata['files'][1]['start'] == len('data1') and metadata['files'][1]['end'] == len('data1') + len('data2') and metadata['files'][1]['filename'] == '/subdir/data2.txt'
    assert metadata['remote_package_size'] == len('data1') + len('data2')

    # can only assert the uuid format is correct, the uuid's value is expected to differ in between invocation
    uuid.UUID(metadata['package_uuid'], version=4)

  def test_file_packager_unicode(self):
    unicode_name = 'unicode…☃'
    if not os.path.exists(unicode_name):
      try:
        os.mkdir(unicode_name)
      except OSError:
        print("we failed to even create a unicode dir, so on this OS, we can't test this")
        return
    full = os.path.join(unicode_name, 'data.txt')
    create_test_file(full, 'data')
    proc = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', full], stdout=PIPE, stderr=PIPE)
    assert len(proc.stdout), proc.stderr
    assert unicode_name in proc.stdout, proc.stdout
    print(len(proc.stderr))

  def test_file_packager_mention_FORCE_FILESYSTEM(self):
    MESSAGE = 'Remember to build the main file with  -s FORCE_FILESYSTEM=1  so that it includes support for loading this file package'
    create_test_file('data.txt', 'data1')
    # mention when running standalone
    err = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'data.txt'], stdout=PIPE, stderr=PIPE).stderr
    self.assertContained(MESSAGE, err)
    # do not mention from emcc
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '--preload-file', 'data.txt'], stdout=PIPE, stderr=PIPE).stderr
    assert len(err) == 0, err

  def test_headless(self):
    shutil.copyfile(path_from_root('tests', 'screenshot.png'), 'example.png')
    run_process([PYTHON, EMCC, path_from_root('tests', 'sdl_headless.c'), '-s', 'HEADLESS=1'])
    output = run_js('a.out.js', stderr=PIPE)
    assert '''Init: 0
Font: 0x1
Sum: 0
you should see two lines of text in different colors and a blue rectangle
SDL_Quit called (and ignored)
done.
''' in output, output

  def test_preprocess(self):
    self.clear()

    out = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-E'], stdout=PIPE).stdout
    assert not os.path.exists('a.out.js')
    # Test explicitly that the output contains a line typically written by the preprocessor.
    # Clang outputs on Windows lines like "#line 1", on Unix '# 1 '.
    # TODO: This is one more of those platform-specific discrepancies, investigate more if this ever becomes an issue,
    # ideally we would have emcc output identical data on all platforms.
    assert '''#line 1 ''' in out or '''# 1 ''' in out
    assert '''hello_world.c"''' in out
    assert '''printf("hello, world!''' in out

  def test_syntax_only_valid(self):
    result = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-fsyntax-only'], stdout=PIPE, stderr=STDOUT)
    self.assertEqual(result.stdout, '')
    self.assertNotExists('a.out.js')

  def test_syntax_only_invalid(self):
    create_test_file('src.c', 'int main() {')
    result = run_process([PYTHON, EMCC, 'src.c', '-fsyntax-only'], stdout=PIPE, check=False, stderr=STDOUT)
    self.assertNotEqual(result.returncode, 0)
    self.assertContained("src.c:1:13: error: expected '}'", result.stdout)
    self.assertNotExists('a.out.js')

  def test_demangle(self):
    create_test_file('src.cpp', '''
      #include <stdio.h>
      #include <emscripten.h>
      void two(char c) {
        EM_ASM(out(stackTrace()));
      }
      void one(int x) {
        two(x % 17);
      }
      int main() {
        EM_ASM(out(demangle('__Znwm'))); // check for no aborts
        EM_ASM(out(demangle('_main')));
        EM_ASM(out(demangle('__Z2f2v')));
        EM_ASM(out(demangle('__Z12abcdabcdabcdi')));
        EM_ASM(out(demangle('__ZL12abcdabcdabcdi')));
        EM_ASM(out(demangle('__Z4testcsifdPvPiPc')));
        EM_ASM(out(demangle('__ZN4test5moarrEcslfdPvPiPc')));
        EM_ASM(out(demangle('__ZN4Waka1f12a234123412345pointEv')));
        EM_ASM(out(demangle('__Z3FooIiEvv')));
        EM_ASM(out(demangle('__Z3FooIidEvi')));
        EM_ASM(out(demangle('__ZN3Foo3BarILi5EEEvv')));
        EM_ASM(out(demangle('__ZNK10__cxxabiv120__si_class_type_info16search_below_dstEPNS_19__dynamic_cast_infoEPKvib')));
        EM_ASM(out(demangle('__Z9parsewordRPKciRi')));
        EM_ASM(out(demangle('__Z5multiwahtjmxyz')));
        EM_ASM(out(demangle('__Z1aA32_iPA5_c')));
        EM_ASM(out(demangle('__ZN21FWakaGLXFleeflsMarfooC2EjjjPKvbjj')));
        EM_ASM(out(demangle('__ZN5wakaw2Cm10RasterBaseINS_6watwat9PolocatorEE8merbine1INS4_2OREEEvPKjj'))); // we get this wrong, but at least emit a '?'
        one(17);
        return 0;
      }
    ''')

    # full demangle support

    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'DEMANGLE_SUPPORT=1'])
    output = run_js('a.out.js')
    self.assertContained('''operator new(unsigned long)
_main
f2()
abcdabcdabcd(int)
abcdabcdabcd(int)
test(char, short, int, float, double, void*, int*, char*)
test::moarr(char, short, long, float, double, void*, int*, char*)
Waka::f::a23412341234::point()
void Foo<int>()
void Foo<int, double>(int)
void Foo::Bar<5>()
__cxxabiv1::__si_class_type_info::search_below_dst(__cxxabiv1::__dynamic_cast_info*, void const*, int, bool) const
parseword(char const*&, int, int&)
multi(wchar_t, signed char, unsigned char, unsigned short, unsigned int, unsigned long, long long, unsigned long long, ...)
a(int [32], char (*) [5])
FWakaGLXFleeflsMarfoo::FWakaGLXFleeflsMarfoo(unsigned int, unsigned int, unsigned int, void const*, bool, unsigned int, unsigned int)
void wakaw::Cm::RasterBase<wakaw::watwat::Polocator>::merbine1<wakaw::Cm::RasterBase<wakaw::watwat::Polocator>::OR>(unsigned int const*, unsigned int)
''', output)
    # test for multiple functions in one stack trace
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'DEMANGLE_SUPPORT=1', '-g'])
    output = run_js('a.out.js')
    self.assertIn('one(int)', output)
    self.assertIn('two(char)', output)

  def test_demangle_cpp(self):
    create_test_file('src.cpp', '''
      #include <stdio.h>
      #include <emscripten.h>
      #include <cxxabi.h>
      #include <assert.h>

      int main() {
        char out[256];
        int status = 1;
        size_t length = 255;
        abi::__cxa_demangle("_ZN4Waka1f12a234123412345pointEv", out, &length, &status);
        assert(status == 0);
        printf("%s\\n", out);
        return 0;
      }
    ''')

    run_process([PYTHON, EMCC, 'src.cpp'])
    output = run_js('a.out.js')
    self.assertContained('Waka::f::a23412341234::point()', output)

  def test_module_exports_with_closure(self):
    # This test checks that module.export is retained when JavaScript is minified by compiling with --closure 1
    # This is important as if module.export is not present the Module object will not be visible to node.js
    # Run with ./runner.py other.test_module_exports_with_closure

    # First make sure test.js isn't present.
    self.clear()

    # compile with -O2 --closure 0
    run_process([PYTHON, EMCC, path_from_root('tests', 'Module-exports', 'test.c'),
                 '-o', 'test.js', '-O2', '--closure', '0',
                 '--pre-js', path_from_root('tests', 'Module-exports', 'setup.js'),
                 '-s', 'EXPORTED_FUNCTIONS=["_bufferTest"]',
                 '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["ccall", "cwrap"]',
                 '-s', 'WASM_ASYNC_COMPILATION=0'])

    # Check that compilation was successful
    self.assertExists('test.js')
    test_js_closure_0 = open('test.js').read()

    # Check that test.js compiled with --closure 0 contains "module['exports'] = Module;"
    assert ("module['exports'] = Module;" in test_js_closure_0) or ('module["exports"]=Module' in test_js_closure_0) or ('module["exports"] = Module;' in test_js_closure_0)

    # Check that main.js (which requires test.js) completes successfully when run in node.js
    # in order to check that the exports are indeed functioning correctly.
    shutil.copyfile(path_from_root('tests', 'Module-exports', 'main.js'), 'main.js')
    if NODE_JS in JS_ENGINES:
      self.assertContained('bufferTest finished', run_js('main.js', engine=NODE_JS))

    # Delete test.js again and check it's gone.
    try_delete('test.js')
    self.assertNotExists('test.js')

    # compile with -O2 --closure 1
    run_process([PYTHON, EMCC, path_from_root('tests', 'Module-exports', 'test.c'),
                 '-o', 'test.js', '-O2', '--closure', '1',
                 '--pre-js', path_from_root('tests', 'Module-exports', 'setup.js'),
                 '-s', 'EXPORTED_FUNCTIONS=["_bufferTest"]',
                 '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["ccall", "cwrap"]',
                 '-s', 'WASM_ASYNC_COMPILATION=0'])

    # Check that compilation was successful
    self.assertExists('test.js')
    test_js_closure_1 = open('test.js').read()

    # Check that test.js compiled with --closure 1 contains "module.exports", we want to verify that
    # "module['exports']" got minified to "module.exports" when compiling with --closure 1
    assert "module.exports" in test_js_closure_1

    # Check that main.js (which requires test.js) completes successfully when run in node.js
    # in order to check that the exports are indeed functioning correctly.
    if NODE_JS in JS_ENGINES:
      self.assertContained('bufferTest finished', run_js('main.js', engine=NODE_JS))

  def test_node_catch_exit(self):
    # Test that in node.js exceptions are not caught if NODEJS_EXIT_CATCH=0
    if NODE_JS not in JS_ENGINES:
      return

    create_test_file('count.c', '''
      #include <string.h>
      int count(const char *str) {
          return (int)strlen(str);
      }
    ''')

    create_test_file('index.js', '''
      const count = require('./count.js');

      console.log(xxx); //< here is the ReferenceError
    ''')

    reference_error_text = 'console.log(xxx); //< here is the ReferenceError'

    run_process([PYTHON, EMCC, 'count.c', '-o', 'count.js'])

    # Check that the ReferenceError is caught and rethrown and thus the original error line is masked
    self.assertNotContained(reference_error_text,
                            run_js('index.js', engine=NODE_JS, stderr=STDOUT, assert_returncode=None))

    run_process([PYTHON, EMCC, 'count.c', '-o', 'count.js', '-s', 'NODEJS_CATCH_EXIT=0'])

    # Check that the ReferenceError is not caught, so we see the error properly
    self.assertContained(reference_error_text,
                         run_js('index.js', engine=NODE_JS, stderr=STDOUT, assert_returncode=None))

  def test_extra_exported_methods(self):
    # Test with node.js that the EXTRA_EXPORTED_RUNTIME_METHODS setting is considered by libraries
    if NODE_JS not in JS_ENGINES:
      self.skipTest("node engine required for this test")

    create_test_file('count.c', '''
      #include <string.h>
      int count(const char *str) {
          return (int)strlen(str);
      }
    ''')

    create_test_file('index.js', '''
      const count = require('./count.js');

      console.log(count.FS_writeFile);
    ''')

    reference_error_text = 'undefined'

    run_process([PYTHON, EMCC, 'count.c', '-s', 'FORCE_FILESYSTEM=1', '-s',
                 'EXTRA_EXPORTED_RUNTIME_METHODS=["FS_writeFile"]', '-o', 'count.js'])

    # Check that the Module.FS_writeFile exists
    self.assertNotContained(reference_error_text,
                            run_js('index.js', engine=NODE_JS, stderr=STDOUT, assert_returncode=None))

    run_process([PYTHON, EMCC, 'count.c', '-s', 'FORCE_FILESYSTEM=1', '-o', 'count.js'])

    # Check that the Module.FS_writeFile is not exported
    self.assertContained(reference_error_text,
                         run_js('index.js', engine=NODE_JS, stderr=STDOUT, assert_returncode=None))

  def test_fs_stream_proto(self):
    open('src.cpp', 'wb').write(br'''
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>

int main()
{
    long file_size = 0;
    int h = open("src.cpp", O_RDONLY, 0666);
    if (0 != h)
    {
        FILE* file = fdopen(h, "rb");
        if (0 != file)
        {
            fseek(file, 0, SEEK_END);
            file_size = ftell(file);
            fseek(file, 0, SEEK_SET);
        }
        else
        {
            printf("fdopen() failed: %s\n", strerror(errno));
            return 10;
        }
        close(h);
        printf("File size: %ld\n", file_size);
    }
    else
    {
        printf("open() failed: %s\n", strerror(errno));
        return 10;
    }
    return 0;
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '--embed-file', 'src.cpp'])
    for engine in JS_ENGINES:
      out = run_js('a.out.js', engine=engine, stderr=PIPE, full_output=True)
      self.assertContained('File size: 724', out)

  def test_proxyfs(self):
    # This test supposes that 3 different programs share the same directory and files.
    # The same JS object is not used for each of them
    # But 'require' function caches JS objects.
    # If we just load same js-file multiple times like following code,
    # these programs (m0,m1,m2) share the same JS object.
    #
    #   var m0 = require('./proxyfs_test.js');
    #   var m1 = require('./proxyfs_test.js');
    #   var m2 = require('./proxyfs_test.js');
    #
    # To separate js-objects for each of them, following 'require' use different js-files.
    #
    #   var m0 = require('./proxyfs_test.js');
    #   var m1 = require('./proxyfs_test1.js');
    #   var m2 = require('./proxyfs_test2.js');
    #
    create_test_file('proxyfs_test_main.js', r'''
var m0 = require('./proxyfs_test.js');
var m1 = require('./proxyfs_test1.js');
var m2 = require('./proxyfs_test2.js');

var section;
function print(str){
  process.stdout.write(section+":"+str+":");
}

m0.FS.mkdir('/working');
m0.FS.mount(m0.PROXYFS,{root:'/',fs:m1.FS},'/working');
m0.FS.mkdir('/working2');
m0.FS.mount(m0.PROXYFS,{root:'/',fs:m2.FS},'/working2');

section = "child m1 reads and writes local file.";
print("m1 read embed");
m1.ccall('myreade','number',[],[]);
print("m1 write");console.log("");
m1.ccall('mywrite0','number',['number'],[1]);
print("m1 read");
m1.ccall('myread0','number',[],[]);


section = "child m2 reads and writes local file.";
print("m2 read embed");
m2.ccall('myreade','number',[],[]);
print("m2 write");console.log("");
m2.ccall('mywrite0','number',['number'],[2]);
print("m2 read");
m2.ccall('myread0','number',[],[]);

section = "child m1 reads local file.";
print("m1 read");
m1.ccall('myread0','number',[],[]);

section = "parent m0 reads and writes local and children's file.";
print("m0 read embed");
m0.ccall('myreade','number',[],[]);
print("m0 read m1");
m0.ccall('myread1','number',[],[]);
print("m0 read m2");
m0.ccall('myread2','number',[],[]);

section = "m0,m1 and m2 verify local files.";
print("m0 write");console.log("");
m0.ccall('mywrite0','number',['number'],[0]);
print("m0 read");
m0.ccall('myread0','number',[],[]);
print("m1 read");
m1.ccall('myread0','number',[],[]);
print("m2 read");
m2.ccall('myread0','number',[],[]);

print("m0 read embed");
m0.ccall('myreade','number',[],[]);
print("m1 read embed");
m1.ccall('myreade','number',[],[]);
print("m2 read embed");
m2.ccall('myreade','number',[],[]);

section = "parent m0 writes and reads children's files.";
print("m0 write m1");console.log("");
m0.ccall('mywrite1','number',[],[]);
print("m0 read m1");
m0.ccall('myread1','number',[],[]);
print("m0 write m2");console.log("");
m0.ccall('mywrite2','number',[],[]);
print("m0 read m2");
m0.ccall('myread2','number',[],[]);
print("m1 read");
m1.ccall('myread0','number',[],[]);
print("m2 read");
m2.ccall('myread0','number',[],[]);
print("m0 read m0");
m0.ccall('myread0','number',[],[]);
''')

    create_test_file('proxyfs_pre.js', r'''
if (typeof Module === 'undefined') Module = {};
Module["noInitialRun"]=true;
noExitRuntime=true;
''')

    create_test_file('proxyfs_embed.txt', r'''test
''')

    create_test_file('proxyfs_test.c', r'''
#include <stdio.h>

int
mywrite1(){
  FILE* out = fopen("/working/hoge.txt","w");
  fprintf(out,"test1\n");
  fclose(out);
  return 0;
}

int
myread1(){
  FILE* in = fopen("/working/hoge.txt","r");
  char buf[1024];
  int len;
  if(in==NULL)
    printf("open failed\n");

  while(! feof(in)){
    if(fgets(buf,sizeof(buf),in)==buf){
      printf("%s",buf);
    }
  }
  fclose(in);
  return 0;
}
int
mywrite2(){
  FILE* out = fopen("/working2/hoge.txt","w");
  fprintf(out,"test2\n");
  fclose(out);
  return 0;
}

int
myread2(){
  {
    FILE* in = fopen("/working2/hoge.txt","r");
    char buf[1024];
    int len;
    if(in==NULL)
      printf("open failed\n");

    while(! feof(in)){
      if(fgets(buf,sizeof(buf),in)==buf){
        printf("%s",buf);
      }
    }
    fclose(in);
  }
  return 0;
}

int
mywrite0(int i){
  FILE* out = fopen("hoge.txt","w");
  fprintf(out,"test0_%d\n",i);
  fclose(out);
  return 0;
}

int
myread0(){
  {
    FILE* in = fopen("hoge.txt","r");
    char buf[1024];
    int len;
    if(in==NULL)
      printf("open failed\n");

    while(! feof(in)){
      if(fgets(buf,sizeof(buf),in)==buf){
        printf("%s",buf);
      }
    }
    fclose(in);
  }
  return 0;
}

int
myreade(){
  {
    FILE* in = fopen("proxyfs_embed.txt","r");
    char buf[1024];
    int len;
    if(in==NULL)
      printf("open failed\n");

    while(! feof(in)){
      if(fgets(buf,sizeof(buf),in)==buf){
        printf("%s",buf);
      }
    }
    fclose(in);
  }
  return 0;
}
''')

    run_process([PYTHON, EMCC,
                 '-o', 'proxyfs_test.js', 'proxyfs_test.c',
                 '--embed-file', 'proxyfs_embed.txt', '--pre-js', 'proxyfs_pre.js',
                 '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["ccall", "cwrap"]',
                 '-s', 'WASM_ASYNC_COMPILATION=0',
                 '-s', 'MAIN_MODULE=1',
                 '-s', 'EXPORT_ALL=1'])
    # Following shutil.copyfile just prevent 'require' of node.js from caching js-object.
    # See https://nodejs.org/api/modules.html
    shutil.copyfile('proxyfs_test.js', 'proxyfs_test1.js')
    shutil.copyfile('proxyfs_test.js', 'proxyfs_test2.js')
    out = run_js('proxyfs_test_main.js')
    section = "child m1 reads and writes local file."
    self.assertContained(section + ":m1 read embed:test", out)
    self.assertContained(section + ":m1 write:", out)
    self.assertContained(section + ":m1 read:test0_1", out)
    section = "child m2 reads and writes local file."
    self.assertContained(section + ":m2 read embed:test", out)
    self.assertContained(section + ":m2 write:", out)
    self.assertContained(section + ":m2 read:test0_2", out)
    section = "child m1 reads local file."
    self.assertContained(section + ":m1 read:test0_1", out)
    section = "parent m0 reads and writes local and children's file."
    self.assertContained(section + ":m0 read embed:test", out)
    self.assertContained(section + ":m0 read m1:test0_1", out)
    self.assertContained(section + ":m0 read m2:test0_2", out)
    section = "m0,m1 and m2 verify local files."
    self.assertContained(section + ":m0 write:", out)
    self.assertContained(section + ":m0 read:test0_0", out)
    self.assertContained(section + ":m1 read:test0_1", out)
    self.assertContained(section + ":m2 read:test0_2", out)
    self.assertContained(section + ":m0 read embed:test", out)
    self.assertContained(section + ":m1 read embed:test", out)
    self.assertContained(section + ":m2 read embed:test", out)
    section = "parent m0 writes and reads children's files."
    self.assertContained(section + ":m0 write m1:", out)
    self.assertContained(section + ":m0 read m1:test1", out)
    self.assertContained(section + ":m0 write m2:", out)
    self.assertContained(section + ":m0 read m2:test2", out)
    self.assertContained(section + ":m1 read:test1", out)
    self.assertContained(section + ":m2 read:test2", out)
    self.assertContained(section + ":m0 read m0:test0_0", out)

  def check_simd(self, expected_simds, expected_out):
    if SPIDERMONKEY_ENGINE in JS_ENGINES:
      out = run_js('a.out.js', engine=SPIDERMONKEY_ENGINE, stderr=PIPE, full_output=True)
      self.validate_asmjs(out)
    else:
      out = run_js('a.out.js')
    self.assertContained(expected_out, out)

    src = open('a.out.js').read()
    asm = src[src.find('// EMSCRIPTEN_START_FUNCS'):src.find('// EMSCRIPTEN_END_FUNCS')]
    simds = asm.count('SIMD_')
    assert simds >= expected_simds, 'expecting to see at least %d SIMD* uses, but seeing %d' % (expected_simds, simds)

  @unittest.skip("autovectorization of this stopped in LLVM 6.0")
  def test_autovectorize_linpack(self):
    # TODO: investigate when SIMD arrives in wasm
    run_process([PYTHON, EMCC, path_from_root('tests', 'linpack.c'), '-O2', '-s', 'SIMD=1', '-DSP', '-s', 'PRECISE_F32=1', '--profiling', '-s', 'WASM=0'])
    self.check_simd(30, 'Unrolled Single  Precision')

  def test_dependency_file(self):
    # Issue 1732: -MMD (and friends) create dependency files that need to be
    # copied from the temporary directory.

    create_test_file('test.cpp', r'''
      #include "test.hpp"

      void my_function()
      {
      }
    ''')
    create_test_file('test.hpp', r'''
      void my_function();
    ''')

    run_process([PYTHON, EMCC, '-MMD', '-c', 'test.cpp', '-o', 'test.o'])

    self.assertExists('test.d')
    deps = open('test.d').read()
    # Look for ': ' instead of just ':' to not confuse C:\path\ notation with make "target: deps" rule. Not perfect, but good enough for this test.
    head, tail = deps.split(': ', 2)
    assert 'test.o' in head, 'Invalid dependency target'
    assert 'test.cpp' in tail and 'test.hpp' in tail, 'Invalid dependencies generated'

  def test_dependency_file_2(self):
    self.clear()
    shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'a.c')
    run_process([PYTHON, EMCC, 'a.c', '-MMD', '-MF', 'test.d', '-c'])
    self.assertContained(open('test.d').read(), 'a.o: a.c\n')

    self.clear()
    shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'a.c')
    run_process([PYTHON, EMCC, 'a.c', '-MMD', '-MF', 'test.d', '-c', '-o', 'test.o'])
    self.assertContained(open('test.d').read(), 'test.o: a.c\n')

    self.clear()
    shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'a.c')
    os.mkdir('obj')
    run_process([PYTHON, EMCC, 'a.c', '-MMD', '-MF', 'test.d', '-c', '-o', 'obj/test.o'])
    self.assertContained(open('test.d').read(), 'obj/test.o: a.c\n')

  def test_js_lib_quoted_key(self):
    create_test_file('lib.js', r'''
mergeInto(LibraryManager.library, {
   __internal_data:{
    '<' : 0,
    'white space' : 1
  },
  printf__deps: ['__internal_data', 'fprintf']
});
''')

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '--js-library', 'lib.js'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_js_lib_exported(self):
    create_test_file('lib.js', r'''
mergeInto(LibraryManager.library, {
 jslibfunc: function(x) { return 2 * x }
});
''')
    create_test_file('src.cpp', r'''
#include <emscripten.h>
#include <stdio.h>
extern "C" int jslibfunc(int x);
int main() {
  printf("c calling: %d\n", jslibfunc(6));
  EM_ASM({
    out('js calling: ' + Module['_jslibfunc'](5) + '.');
  });
}
''')
    run_process([PYTHON, EMCC, 'src.cpp', '--js-library', 'lib.js', '-s', 'EXPORTED_FUNCTIONS=["_main", "_jslibfunc"]'])
    self.assertContained('c calling: 12\njs calling: 10.', run_js('a.out.js'))

  def test_js_lib_primitive_dep(self):
    # Verify that primitive dependencies aren't generated in the output JS.

    create_test_file('lib.js', r'''
mergeInto(LibraryManager.library, {
  foo__deps: ['Int8Array', 'NonPrimitive'],
  foo: function() {},
});
''')
    create_test_file('main.c', r'''
void foo(void);

int main(int argc, char** argv) {
  foo();
  return 0;
}
''')
    run_process([PYTHON, EMCC, '-O0', 'main.c', '--js-library', 'lib.js', '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0'])
    generated = open('a.out.js').read()
    self.assertContained('missing function: NonPrimitive', generated)
    self.assertNotContained('missing function: Int8Array', generated)

  def test_js_lib_using_asm_lib(self):
    create_test_file('lib.js', r'''
mergeInto(LibraryManager.library, {
  jslibfunc__deps: ['asmlibfunc'],
  jslibfunc: function(x) {
    return 2 * _asmlibfunc(x);
  },

  asmlibfunc__asm: true,
  asmlibfunc__sig: 'ii',
  asmlibfunc: function(x) {
    x = x | 0;
    return x + 1 | 0;
  }
});
''')
    create_test_file('src.cpp', r'''
#include <stdio.h>
extern "C" int jslibfunc(int x);
int main() {
  printf("c calling: %d\n", jslibfunc(6));
}
''')
    run_process([PYTHON, EMCC, 'src.cpp', '--js-library', 'lib.js'])
    self.assertContained('c calling: 14\n', run_js('a.out.js'))

  def test_EMCC_BUILD_DIR(self):
    # EMCC_BUILD_DIR env var contains the dir we were building in, when running the js compiler (e.g. when
    # running a js library). We force the cwd to be src/ for technical reasons, so this lets you find out
    # where you were.
    create_test_file('lib.js', r'''
printErr('dir was ' + process.env.EMCC_BUILD_DIR);
''')
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '--js-library', 'lib.js'], stderr=PIPE).stderr
    self.assertContained('dir was ' + os.path.realpath(os.path.normpath(self.get_dir())), err)

  def test_float_h(self):
    process = run_process([PYTHON, EMCC, path_from_root('tests', 'float+.c')], stdout=PIPE, stderr=PIPE)
    assert process.returncode == 0, 'float.h should agree with our system: ' + process.stdout + '\n\n\n' + process.stderr

  def test_output_is_dir(self):
    outdir = 'out_dir/'
    os.mkdir(outdir)
    err = self.expect_fail([PYTHON, EMCC, '-c', path_from_root('tests', 'hello_world.c'), '-o', outdir])
    self.assertContained('error: unable to open output file', err)

  def test_default_obj_ext(self):
    run_process([PYTHON, EMCC, '-c', path_from_root('tests', 'hello_world.c')])
    self.assertExists('hello_world.o')

    run_process([PYTHON, EMCC, '-c', path_from_root('tests', 'hello_world.c'), '--default-obj-ext', 'obj'])
    self.assertExists('hello_world.obj')

  def test_doublestart_bug(self):
    create_test_file('code.cpp', r'''
#include <stdio.h>
#include <emscripten.h>

void main_loop(void) {
    static int cnt = 0;
    if (++cnt >= 10) emscripten_cancel_main_loop();
}

int main(void) {
    printf("This should only appear once.\n");
    emscripten_set_main_loop(main_loop, 10, 0);
    return 0;
}
''')

    create_test_file('pre.js', r'''
if (!Module['preRun']) Module['preRun'] = [];
Module["preRun"].push(function () {
    addRunDependency('test_run_dependency');
    removeRunDependency('test_run_dependency');
});
''')

    run_process([PYTHON, EMCC, 'code.cpp', '--pre-js', 'pre.js'])
    output = run_js('a.out.js', engine=NODE_JS)

    assert output.count('This should only appear once.') == 1, output

  def test_module_print(self):
    create_test_file('code.cpp', r'''
#include <stdio.h>
int main(void) {
  printf("123456789\n");
  return 0;
}
''')

    create_test_file('pre.js', r'''
var Module = { print: function(x) { throw '<{(' + x + ')}>' } };
''')

    run_process([PYTHON, EMCC, 'code.cpp', '--pre-js', 'pre.js'])
    output = run_js('a.out.js', stderr=PIPE, full_output=True, engine=NODE_JS, assert_returncode=None)
    assert r'<{(123456789)}>' in output, output

  def test_precompiled_headers(self):
    for suffix in ['gch', 'pch']:
      print(suffix)
      self.clear()

      create_test_file('header.h', '#define X 5\n')
      run_process([PYTHON, EMCC, '-xc++-header', 'header.h', '-c'])
      self.assertExists('header.h.gch') # default output is gch
      if suffix != 'gch':
        run_process([PYTHON, EMCC, '-xc++-header', 'header.h', '-o', 'header.h.' + suffix])
        assert open('header.h.gch', 'rb').read() == open('header.h.' + suffix, 'rb').read()

      create_test_file('src.cpp', r'''
#include <stdio.h>
int main() {
  printf("|%d|\n", X);
  return 0;
}
''')
      run_process([PYTHON, EMCC, 'src.cpp', '-include', 'header.h'])

      output = run_js('a.out.js', stderr=PIPE, full_output=True, engine=NODE_JS)
      assert '|5|' in output, output

      # also verify that the gch is actually used
      err = run_process([PYTHON, EMCC, 'src.cpp', '-include', 'header.h', '-Xclang', '-print-stats'], stderr=PIPE).stderr
      self.assertTextDataContained('*** PCH/Modules Loaded:\nModule: header.h.' + suffix, err)
      # and sanity check it is not mentioned when not
      try_delete('header.h.' + suffix)
      err = run_process([PYTHON, EMCC, 'src.cpp', '-include', 'header.h', '-Xclang', '-print-stats'], stderr=PIPE).stderr
      assert '*** PCH/Modules Loaded:\nModule: header.h.' + suffix not in err.replace('\r\n', '\n'), err

      # with specified target via -o
      try_delete('header.h.' + suffix)
      run_process([PYTHON, EMCC, '-xc++-header', 'header.h', '-o', 'my.' + suffix])
      self.assertExists('my.' + suffix)

      # -include-pch flag
      run_process([PYTHON, EMCC, '-xc++-header', 'header.h', '-o', 'header.h.' + suffix])
      run_process([PYTHON, EMCC, 'src.cpp', '-include-pch', 'header.h.' + suffix])
      output = run_js('a.out.js')
      assert '|5|' in output, output

  @no_wasm_backend('tests extra fastcomp warnings on unaligned loads/stores, which matter a lot more in asm.js')
  def test_warn_unaligned(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>
struct packey {
  char x;
  int y;
  double z;
} __attribute__((__packed__));
int main() {
  volatile packey p;
  p.x = 0;
  p.y = 1;
  p.z = 2;
  return 0;
}
''')
    output = run_process([PYTHON, EMCC, 'src.cpp', '-s', 'WASM=0', '-s', 'WARN_UNALIGNED=1'], stderr=PIPE)
    output = run_process([PYTHON, EMCC, 'src.cpp', '-s', 'WASM=0', '-s', 'WARN_UNALIGNED=1', '-g'], stderr=PIPE)
    assert 'emcc: warning: unaligned store' in output.stderr, output.stderr
    assert 'emcc: warning: unaligned store' in output.stderr, output.stderr
    assert '@line 11 "src.cpp"' in output.stderr, output.stderr

  def test_LEGACY_VM_SUPPORT(self):
    # when modern features are lacking, we can polyfill them or at least warn
    create_test_file('pre.js', 'Math.imul = undefined;')

    def test(expected, opts=[]):
      print(opts)
      result = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '--pre-js', 'pre.js'] + opts, stderr=PIPE, check=False)
      if result.returncode == 0:
        self.assertContained(expected, run_js('a.out.js', stderr=PIPE, full_output=True, engine=NODE_JS, assert_returncode=None))
      else:
        self.assertContained(expected, result.stderr)

    # when legacy is needed, we show an error indicating so
    test('build with LEGACY_VM_SUPPORT')
    # wasm is on by default, and does not mix with legacy, so we show an error
    test('LEGACY_VM_SUPPORT is only supported for asm.js, and not wasm. Build with -s WASM=0', ['-s', 'LEGACY_VM_SUPPORT=1'])
    # legacy + disabling wasm works
    if self.is_wasm_backend():
      return
    test('hello, world!', ['-s', 'LEGACY_VM_SUPPORT=1', '-s', 'WASM=0'])

  def test_on_abort(self):
    expected_output = 'Module.onAbort was called'

    def add_on_abort_and_verify(extra=''):
      with open('a.out.js') as f:
        js = f.read()
      with open('a.out.js', 'w') as f:
        f.write("var Module = { onAbort: function() { console.log('%s') } };\n" % expected_output)
        f.write(extra + '\n')
        f.write(js)
      self.assertContained(expected_output, run_js('a.out.js', assert_returncode=None))

    # test direct abort() C call

    create_test_file('src.c', '''
        #include <stdlib.h>
        int main() {
          abort();
        }
      ''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM_ASYNC_COMPILATION=0'])
    add_on_abort_and_verify()

    # test direct abort() JS call

    create_test_file('src.c', '''
        #include <emscripten.h>
        int main() {
          EM_ASM({ abort() });
        }
      ''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM_ASYNC_COMPILATION=0'])
    add_on_abort_and_verify()

    # test throwing in an abort handler, and catching that

    create_test_file('src.c', '''
        #include <emscripten.h>
        int main() {
          EM_ASM({
            try {
              out('first');
              abort();
            } catch (e) {
              out('second');
              abort();
              throw e;
            }
          });
        }
      ''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM_ASYNC_COMPILATION=0'])
    with open('a.out.js') as f:
      js = f.read()
    with open('a.out.js', 'w') as f:
      f.write("var Module = { onAbort: function() { console.log('%s'); throw 're-throw'; } };\n" % expected_output)
      f.write(js)
    out = run_js('a.out.js', stderr=STDOUT, assert_returncode=None)
    print(out)
    self.assertContained(expected_output, out)
    self.assertContained('re-throw', out)
    self.assertContained('first', out)
    self.assertContained('second', out)
    self.assertEqual(out.count(expected_output), 2)

    # test an abort during startup
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])
    os.remove('a.out.wasm') # trigger onAbort by intentionally causing startup to fail
    add_on_abort_and_verify()

  def test_no_exit_runtime(self):
    create_test_file('code.cpp', r'''
#include <stdio.h>

template<int x>
struct Waste {
  Waste() {
    printf("coming around %d\n", x);
  }
  ~Waste() {
    printf("going away %d\n", x);
  }
};

Waste<1> w1;
Waste<2> w2;
Waste<3> w3;
Waste<4> w4;
Waste<5> w5;

int main(int argc, char **argv) {
  return 0;
}
    ''')

    for wasm in [0, 1]:
      for no_exit in [1, 0]:
        for opts in [[], ['-O1'], ['-O2', '-g2'], ['-O2', '-g2', '--llvm-lto', '1']]:
          if self.is_wasm_backend() and not wasm:
            continue
          print(wasm, no_exit, opts)
          cmd = [PYTHON, EMCC] + opts + ['code.cpp', '-s', 'EXIT_RUNTIME=' + str(1 - no_exit), '-s', 'WASM=' + str(wasm)]
          if wasm:
            cmd += ['--profiling-funcs'] # for function names
          run_process(cmd)
          output = run_js('a.out.js', stderr=PIPE, full_output=True, engine=NODE_JS)
          src = open('a.out.js').read()
          if wasm:
            src += '\n' + self.get_wasm_text('a.out.wasm')
          exit = 1 - no_exit
          print('  exit:', exit, 'opts:', opts)
          self.assertContained('coming around', output)
          self.assertContainedIf('going away', output, exit)
          if not self.is_wasm_backend():
            # The wasm backend uses atexit to register destructors when
            # constructors are called  There is currently no way to exclude
            # these destructors from the wasm binary.
            assert ('atexit(' in src) == exit, 'atexit should not appear in src when EXIT_RUNTIME=0'
            assert ('_ZN5WasteILi2EED' in src) == exit, 'destructors should not appear if no exit:\n' + src

  def test_no_exit_runtime_warnings_flush(self):
    # check we warn if there is unflushed info
    create_test_file('code.c', r'''
#include <stdio.h>
int main(int argc, char **argv) {
  printf("hello\n");
  printf("world"); // no newline, not flushed
#if FLUSH
  printf("\n");
#endif
}
''')
    create_test_file('code.cpp', r'''
#include <iostream>
int main() {
  using namespace std;
  cout << "hello" << std::endl;
  cout << "world"; // no newline, not flushed
#if FLUSH
  std::cout << std::endl;
#endif
}
''')
    for src in ['code.c', 'code.cpp']:
      for no_exit in [0, 1]:
        for assertions in [0, 1]:
          for flush in [0, 1]:
            # TODO: also check FILESYSTEM=0 here. it never worked though, buffered output was not emitted at shutdown
            print(src, no_exit, assertions, flush)
            cmd = [PYTHON, EMCC, src, '-s', 'EXIT_RUNTIME=%d' % (1 - no_exit), '-s', 'ASSERTIONS=%d' % assertions]
            if flush:
              cmd += ['-DFLUSH']
            run_process(cmd)
            output = run_js('a.out.js', stderr=PIPE, full_output=True)
            exit = 1 - no_exit
            assert 'hello' in output, output
            assert ('world' in output) == (exit or flush), 'unflushed content is shown only when exiting the runtime'
            assert (no_exit and assertions and not flush) == ('stdio streams had content in them that was not flushed. you should set EXIT_RUNTIME to 1' in output), 'warning should be shown'

  def test_fs_after_main(self):
    for args in [[], ['-O1']]:
      print(args)
      run_process([PYTHON, EMCC, path_from_root('tests', 'fs_after_main.cpp')])
      self.assertContained('Test passed.', run_js('a.out.js', engine=NODE_JS))

  @no_wasm_backend('tests fastcomp compiler flags')
  def test_os_oz(self):
    for arg, expect in [
        ('-O1', '-O1'),
        ('-O2', '-O3'),
        ('-Os', '-Os'),
        ('-Oz', '-Oz'),
        ('-O3', '-O3'),
      ]:
      print(arg, expect)
      proc = run_process([PYTHON, EMCC, '-v', path_from_root('tests', 'hello_world.cpp'), arg], stderr=PIPE)
      self.assertContained(expect, proc.stderr)
      self.assertContained('hello, world!', run_js('a.out.js'))

  def test_oz_size(self):
    sizes = {}
    for name, args in [
        ('0', []),
        ('1', ['-O1']),
        ('2', ['-O2']),
        ('s', ['-Os']),
        ('z', ['-Oz']),
        ('3', ['-O3']),
      ]:
      print(name, args)
      self.clear()
      run_process([PYTHON, EMCC, '-c', path_from_root('system', 'lib', 'dlmalloc.c')] + args)
      sizes[name] = os.path.getsize('dlmalloc.o')
    print(sizes)
    opt_min = min(sizes['1'], sizes['2'], sizes['3'], sizes['s'], sizes['z'])
    opt_max = max(sizes['1'], sizes['2'], sizes['3'], sizes['s'], sizes['z'])
    # 'opt builds are all fairly close'
    self.assertLess(opt_min - opt_max, opt_max * 0.1)
    # unopt build is quite larger'
    self.assertGreater(sizes['0'], (1.20 * opt_max))

  @no_wasm_backend('relies on ctor evaluation and dtor elimination')
  def test_global_inits(self):
    create_test_file('inc.h', r'''
#include <stdio.h>

template<int x>
struct Waste {
  int state;
  Waste() : state(10) {}
  void test(int a) {
    printf("%d\n", a + state);
  }
  ~Waste() {
    printf("going away %d\n", x);
  }
};

Waste<3> *getMore();
''')

    create_test_file('main.cpp', r'''
#include "inc.h"

Waste<1> mw1;
Waste<2> mw2;

int main(int argc, char **argv) {
  printf("argc: %d\n", argc);
  mw1.state += argc;
  mw2.state += argc;
  mw1.test(5);
  mw2.test(6);
  getMore()->test(0);
  return 0;
}
''')

    create_test_file('side.cpp', r'''
#include "inc.h"

Waste<3> sw3;

Waste<3> *getMore() {
  return &sw3;
}
''')

    for opts, has_global in [
      (['-O2', '-g', '-s', 'EXIT_RUNTIME=1'], True),
      # no-exit-runtime removes the atexits, and then globalgce can work
      # it's magic to remove the global initializer entirely
      (['-O2', '-g'], False),
      (['-Os', '-g', '-s', 'EXIT_RUNTIME=1'], True),
      (['-Os', '-g'], False),
      (['-O2', '-g', '--llvm-lto', '1', '-s', 'EXIT_RUNTIME=1'], True),
      (['-O2', '-g', '--llvm-lto', '1'], False),
    ]:
      print(opts, has_global)
      run_process([PYTHON, EMCC, 'main.cpp', '-c'] + opts)
      run_process([PYTHON, EMCC, 'side.cpp', '-c'] + opts)
      run_process([PYTHON, EMCC, 'main.o', 'side.o'] + opts)
      run_js('a.out.js', stderr=PIPE, full_output=True, engine=NODE_JS)
      src = open('a.out.js').read()
      self.assertContained('argc: 1\n16\n17\n10\n', run_js('a.out.js'))
      self.assertContainedIf('globalCtors', src, has_global)

  # Tests that when there are only 0 or 1 global initializers, that a grouped global initializer function will not be generated
  # (that would just consume excess code size)
  def test_no_global_inits(self):
    create_test_file('one_global_initializer.cpp', r'''
#include <emscripten.h>
#include <stdio.h>
double t = emscripten_get_now();
int main() { printf("t:%d\n", (int)(t>0)); }
''')
    run_process([PYTHON, EMCC, 'one_global_initializer.cpp'])
    # Above file has one global initializer, should not generate a redundant grouped globalCtors function
    self.assertNotContained('globalCtors', open('a.out.js').read())
    self.assertContained('t:1', run_js('a.out.js'))

    create_test_file('zero_global_initializers.cpp', r'''
#include <stdio.h>
int main() { printf("t:1\n"); }
''')
    run_process([PYTHON, EMCC, 'zero_global_initializers.cpp'])
    # Above file should have zero global initializers, should not generate any global initializer functions
    self.assertNotContained('__GLOBAL__sub_', open('a.out.js').read())
    self.assertContained('t:1', run_js('a.out.js'))

  def test_implicit_func(self):
    create_test_file('src.c', r'''
#include <stdio.h>
int main()
{
    printf("hello %d\n", strnlen("waka", 2)); // Implicit declaration, no header, for strnlen
    int (*my_strnlen)(char*, ...) = strnlen;
    printf("hello %d\n", my_strnlen("shaka", 2));
    return 0;
}
''')

    IMPLICIT_WARNING = '''warning: implicit declaration of function 'strnlen' is invalid in C99'''
    IMPLICIT_ERROR = '''error: implicit declaration of function 'strnlen' is invalid in C99'''

    for opts, expected, compile_expected in [
      ([], None, [IMPLICIT_ERROR]),
      (['-Wno-error=implicit-function-declaration'], ['hello '], [IMPLICIT_WARNING]), # turn error into warning
      (['-Wno-implicit-function-declaration'], ['hello '], []), # turn error into nothing at all (runtime output is incorrect)
    ]:
      print(opts, expected)
      try_delete('a.out.js')
      stderr = run_process([PYTHON, EMCC, 'src.c'] + opts, stderr=PIPE, check=False).stderr
      for ce in compile_expected + ['''warning: incompatible pointer types''']:
        self.assertContained(ce, stderr)
      if expected is None:
        assert not os.path.exists('a.out.js')
      else:
        output = run_js('a.out.js', stderr=PIPE, full_output=True)
        for e in expected:
          self.assertContained(e, output)

  @no_wasm_backend('uses prebuilt .ll file')
  def test_incorrect_static_call(self):
    for wasm in [0, 1]:
      for opts in [0, 1]:
        for asserts in [0, 1]:
          extra = []
          if opts != 1 - asserts:
            extra = ['-s', 'ASSERTIONS=' + str(asserts)]
          cmd = [PYTHON, EMCC, path_from_root('tests', 'sillyfuncast2_noasm.ll'), '-O' + str(opts), '-s', 'WASM=' + str(wasm)] + extra
          print(opts, asserts, wasm, cmd)
          # Should not need to pipe stdout here but binaryen writes to stdout
          # when it really should write to stderr.
          stderr = run_process(cmd, stdout=PIPE, stderr=PIPE, check=False).stderr
          assert ('unexpected' in stderr) == asserts, stderr
          assert ("to 'doit'" in stderr) == asserts, stderr

  @no_wasm_backend('fastcomp specific')
  def test_llvm_lit(self):
    grep_path = Building.which('grep')
    if not grep_path:
      self.skipTest('This test needs the "grep" tool in PATH. If you are using emsdk on Windows, you can obtain it via installing and activating the gnu package.')
    llvm_src = get_fastcomp_src_dir()
    if not llvm_src:
      self.skipTest('llvm source tree not found')
    LLVM_LIT = os.path.join(LLVM_ROOT, 'llvm-lit.py')
    if not os.path.exists(LLVM_LIT):
      LLVM_LIT = os.path.join(LLVM_ROOT, 'llvm-lit')
      if not os.path.exists(LLVM_LIT):
        self.skipTest('llvm-lit not found; fastcomp directory is most likely prebuilt')
    cmd = [PYTHON, LLVM_LIT, '-v', os.path.join(llvm_src, 'test', 'CodeGen', 'JS')]
    print(cmd)
    run_process(cmd)

  def test_bad_triple(self):
    # compile a minimal program, with as few dependencies as possible, as
    # native building on CI may not always work well
    create_test_file('minimal.cpp', 'int main() { return 0; }')
    try:
      vs_env = shared.get_clang_native_env()
    except Exception:
      self.skipTest('Native clang env not found')
    run_process([CLANG, 'minimal.cpp', '-target', 'x86_64-linux', '-c', '-emit-llvm', '-o', 'a.bc'] + shared.get_clang_native_args(), env=vs_env)
    err = run_process([PYTHON, EMCC, 'a.bc'], stdout=PIPE, stderr=PIPE, check=False).stderr
    if self.is_wasm_backend():
      self.assertContained('machine type must be wasm32', err)
    else:
      assert 'warning' in err or 'WARNING' in err, err
      assert 'incorrect target triple' in err or 'different target triples' in err, err

  def test_valid_abspath(self):
    # Test whether abspath warning appears
    abs_include_path = os.path.abspath(self.get_dir())
    err = run_process([PYTHON, EMCC, '-I%s' % abs_include_path, '-Wwarn-absolute-paths', path_from_root('tests', 'hello_world.c')], stdout=PIPE, stderr=PIPE).stderr
    warning = '-I or -L of an absolute path "-I%s" encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript).' % abs_include_path
    assert(warning in err)

    # Passing an absolute path to a directory inside the emscripten tree is always ok and should not issue a warning.
    abs_include_path = path_from_root('tests')
    err = run_process([PYTHON, EMCC, '-I%s' % abs_include_path, '-Wwarn-absolute-paths', path_from_root('tests', 'hello_world.c')], stdout=PIPE, stderr=PIPE).stderr
    warning = '-I or -L of an absolute path "-I%s" encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript).' % abs_include_path
    assert(warning not in err)

    # Hide warning for this include path
    err = run_process([PYTHON, EMCC, '--valid-abspath', abs_include_path, '-I%s' % abs_include_path, '-Wwarn-absolute-paths', path_from_root('tests', 'hello_world.c')], stdout=PIPE, stderr=PIPE).stderr
    assert(warning not in err)

  def test_valid_abspath_2(self):
    if WINDOWS:
      abs_include_path = 'C:\\nowhere\\at\\all'
    else:
      abs_include_path = '/nowhere/at/all'
    cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '--valid-abspath', abs_include_path, '-I%s' % abs_include_path]
    print(' '.join(cmd))
    run_process(cmd)
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_warn_dylibs(self):
    shared_suffixes = ['.so', '.dylib', '.dll']

    for suffix in ['.o', '.a', '.bc', '.so', '.lib', '.dylib', '.js', '.html']:
      print(suffix)
      err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'out' + suffix], stderr=PIPE).stderr
      warning = 'When Emscripten compiles to a typical native suffix for shared libraries (.so, .dylib, .dll) then it emits an object file. You should then compile that to an emscripten SIDE_MODULE (using that flag) with suffix .wasm (for wasm) or .js (for asm.js).'
      self.assertContainedIf(warning, err, suffix in shared_suffixes)

  def test_side_module_without_proper_target(self):
    # SIDE_MODULE is only meaningful when compiling to wasm (or js+wasm)
    # otherwise, we are just linking bitcode, and should show an error
    for wasm in [0, 1]:
      if self.is_wasm_backend() and not wasm:
        continue
      print(wasm)
      stderr = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'SIDE_MODULE=1', '-o', 'a.so', '-s', 'WASM=%d' % wasm])
      self.assertContained('SIDE_MODULE must only be used when compiling to an executable shared library, and not when emitting an object file', stderr)

  @no_wasm_backend('asm.js optimizations')
  def test_simplify_ifs(self):
    def test(src, nums):
      create_test_file('src.c', src)
      for opts, ifs in [
        [['-g2'], nums[0]],
        [['--profiling'], nums[1]],
        [['--profiling', '-g2'], nums[2]]
      ]:
        print(opts, ifs)
        if type(ifs) == int:
          ifs = [ifs]
        try_delete('a.out.js')
        run_process([PYTHON, EMCC, 'src.c', '-O2', '-s', 'WASM=0'] + opts, stdout=PIPE)
        src = open('a.out.js').read()
        main = src[src.find('function _main'):src.find('\n}', src.find('function _main'))]
        actual_ifs = main.count('if (')
        assert actual_ifs in ifs, main + ' : ' + str([ifs, actual_ifs])

    test(r'''
      #include <stdio.h>
      #include <string.h>
      int main(int argc, char **argv) {
        if (argc > 5 && strlen(argv[0]) > 1 && strlen(argv[1]) > 2) printf("halp");
        return 0;
      }
    ''', [3, 1, 1])

    test(r'''
      #include <stdio.h>
      #include <string.h>
      int main(int argc, char **argv) {
        while (argc % 3 == 0) {
          if (argc > 5 && strlen(argv[0]) > 1 && strlen(argv[1]) > 2) {
            printf("halp");
            argc++;
          } else {
            while (argc > 0) {
              printf("%d\n", argc--);
            }
          }
        }
        return 0;
      }
    ''', [8, [5, 7], [5, 7]])

    test(r'''
      #include <stdio.h>
      #include <string.h>
      int main(int argc, char **argv) {
        while (argc % 17 == 0) argc *= 2;
        if (argc > 5 && strlen(argv[0]) > 10 && strlen(argv[1]) > 20) {
          printf("halp");
          argc++;
        } else {
          printf("%d\n", argc--);
        }
        while (argc % 17 == 0) argc *= 2;
        return argc;
      }
    ''', [6, 3, 3])

    test(r'''
      #include <stdio.h>
      #include <stdlib.h>

      int main(int argc, char *argv[]) {
        if (getenv("A") && getenv("B")) {
            printf("hello world\n");
        } else {
            printf("goodnight moon\n");
        }
        printf("and that's that\n");
        return 0;
      }
    ''', [[3, 2], 1, 1])

    test(r'''
      #include <stdio.h>
      #include <stdlib.h>

      int main(int argc, char *argv[]) {
        if (getenv("A") || getenv("B")) {
            printf("hello world\n");
        }
        printf("and that's that\n");
        return 0;
      }
    ''', [[3, 2], 1, 1])

  def test_symbol_map(self):
    for opts in [['-O2'], ['-O3']]:
      for wasm in [0, 1]:
        print(opts, wasm)
        self.clear()
        create_test_file('src.c', r'''
#include <emscripten.h>

EM_JS(int, run_js, (), {
out(new Error().stack);
return 0;
});

EMSCRIPTEN_KEEPALIVE
void middle() {
  if (run_js()) {
    // fake recursion that is never reached, to avoid inlining in binaryen and LLVM
    middle();
  }
}

int main() {
EM_ASM({ _middle() });
}
''')
        cmd = [PYTHON, EMCC, 'src.c', '--emit-symbol-map'] + opts
        if not wasm:
          cmd += ['-s', 'WASM=0']
        run_process(cmd)
        # check that the map is correct
        with open('a.out.js.symbols') as f:
          symbols = f.read()
        lines = [line.split(':') for line in symbols.strip().split('\n')]
        minified_middle = None
        for minified, full in lines:
          # handle both fastcomp and wasm backend notation
          if full == '_middle' or full == 'middle':
            minified_middle = minified
            break
        self.assertNotEqual(minified_middle, None)
        if wasm:
          # stack traces are standardized enough that we can easily check that the
          # minified name is actually in the output
          stack_trace_reference = 'wasm-function[%s]' % minified_middle
          out = run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None)
          self.assertContained(stack_trace_reference, out)
          # make sure there are no symbols in the wasm itself
          wast = run_process([os.path.join(Building.get_binaryen_bin(), 'wasm-dis'), 'a.out.wasm'], stdout=PIPE).stdout
          for func_start in ('(func $middle', '(func $_middle'):
            self.assertNotContained(func_start, wast)

  def test_bc_to_bc(self):
    # emcc should 'process' bitcode to bitcode. build systems can request this if
    # e.g. they assume our 'executable' extension is bc, and compile an .o to a .bc
    # (the user would then need to build bc to js of course, but we need to actually
    # emit the bc)
    run_process([PYTHON, EMCC, '-c', path_from_root('tests', 'hello_world.c')])
    self.assertExists('hello_world.o')
    run_process([PYTHON, EMCC, 'hello_world.o', '-o', 'hello_world.bc'])
    self.assertExists('hello_world.o')
    self.assertExists('hello_world.bc')

  def test_bad_function_pointer_cast(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>

typedef int (*callback) (int, ...);

int impl(int foo) {
  printf("Hello, world.\n");
  return 0;
}

int main() {
  volatile callback f = (callback) impl;
  f(0); /* This fails with or without additional arguments. */
  return 0;
}
''')

    for opts in [0, 1, 2]:
      for safe in [0, 1]:
        for emulate_casts in [0, 1]:
          for emulate_fps in [0, 1]:
            for relocatable in [0, 1]:
              for wasm in [0, 1]:
                if self.is_wasm_backend() and (not wasm or emulate_fps):
                  continue
                if emulate_casts and self.is_wasm_backend() and relocatable:
                  # TODO('https://github.com/emscripten-core/emscripten/issues/8507')
                  continue
                cmd = [PYTHON, EMCC, 'src.cpp', '-O' + str(opts)]
                if not wasm:
                  cmd += ['-s', 'WASM=0']
                if safe:
                  cmd += ['-s', 'SAFE_HEAP']
                if emulate_casts:
                  cmd += ['-s', 'EMULATE_FUNCTION_POINTER_CASTS']
                if emulate_fps:
                  cmd += ['-s', 'EMULATED_FUNCTION_POINTERS']
                if relocatable:
                  cmd += ['-s', 'RELOCATABLE'] # disables asm-optimized safe heap
                print(cmd)
                run_process(cmd)
                output = run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=None)
                if emulate_casts:
                  # success!
                  self.assertContained('Hello, world.', output)
                else:
                  # otherwise, the error depends on the mode we are in
                  if self.is_wasm_backend() or (wasm and (relocatable or emulate_fps)):
                    # wasm trap raised by the vm
                    self.assertContained('function signature mismatch', output)
                  elif opts == 0 and safe and not wasm:
                    # non-wasm safe mode checks asm.js function table masks
                    self.assertContained('Function table mask error', output)
                  elif opts == 0:
                    # informative error message (assertions are enabled in -O0)
                    self.assertContained('Invalid function pointer', output)
                  else:
                    # non-informative error
                    self.assertContained(('abort(', 'exception'), output)

  @no_wasm_backend('asm.js function table feature')
  def test_aliased_func_pointers(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>

int impl1(int foo) { return foo; }
float impla(float foo) { return foo; }
int impl2(int foo) { return foo+1; }
float implb(float foo) { return foo+1; }
int impl3(int foo) { return foo+2; }
float implc(float foo) { return foo+2; }

int main(int argc, char **argv) {
  volatile void *f = (void*)impl1;
  if (argc == 50) f = (void*)impla;
  if (argc == 51) f = (void*)impl2;
  if (argc == 52) f = (void*)implb;
  if (argc == 53) f = (void*)impl3;
  if (argc == 54) f = (void*)implc;
  return (int)f;
}
''')

    print('aliasing')

    sizes_ii = {}
    sizes_dd = {}

    for alias in [None, 0, 1]:
      cmd = [PYTHON, EMCC, 'src.cpp', '-O1', '-s', 'WASM=0']
      if alias is not None:
        cmd += ['-s', 'ALIASING_FUNCTION_POINTERS=' + str(alias)]
      else:
        alias = -1
      print(cmd)
      run_process(cmd)
      src = open('a.out.js').read().split('\n')
      for line in src:
        if line.strip().startswith('var FUNCTION_TABLE_ii = '):
          sizes_ii[alias] = line.count(',')
        if line.strip().startswith('var FUNCTION_TABLE_dd = '):
          sizes_dd[alias] = line.count(',')

    print('ii', sizes_ii)
    print('dd', sizes_dd)

    for sizes in [sizes_ii, sizes_dd]:
      assert sizes[-1] == sizes[1] # default is to alias
      assert sizes[1] < sizes[0] # without aliasing, we have more unique values and fat tables

  def test_bad_export(self):
    for m in ['', ' ']:
      self.clear()
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EXPORTED_FUNCTIONS=["' + m + '_main"]']
      print(cmd)
      stderr = run_process(cmd, stderr=PIPE, check=False).stderr
      if m:
        self.assertContained('undefined exported function: " _main"', stderr)
      else:
        self.assertContained('hello, world!', run_js('a.out.js'))

  def test_no_dynamic_execution(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O1', '-s', 'DYNAMIC_EXECUTION=0'])
    self.assertContained('hello, world!', run_js('a.out.js'))
    src = open('a.out.js').read()
    assert 'eval(' not in src
    assert 'eval.' not in src
    assert 'new Function' not in src
    try_delete('a.out.js')

    # Test that --preload-file doesn't add an use of eval().
    create_test_file('temp.txt', "foo\n")
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O1',
                 '-s', 'DYNAMIC_EXECUTION=0', '--preload-file', 'temp.txt'])
    src = open('a.out.js').read()
    assert 'eval(' not in src
    assert 'eval.' not in src
    assert 'new Function' not in src
    try_delete('a.out.js')

    # Test that -s DYNAMIC_EXECUTION=0 and --closure 1 are not allowed together.
    self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O1',
                      '-s', 'DYNAMIC_EXECUTION=0', '--closure', '1'])
    try_delete('a.out.js')

    # Test that -s DYNAMIC_EXECUTION=1 and -s RELOCATABLE=1 are not allowed together.
    self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O1',
                      '-s', 'DYNAMIC_EXECUTION=0', '-s', 'RELOCATABLE=1'])
    try_delete('a.out.js')

    create_test_file('test.c', r'''
      #include <emscripten/emscripten.h>
      int main() {
        emscripten_run_script("console.log('hello from script');");
        return 0;
      }
      ''')

    # Test that emscripten_run_script() aborts when -s DYNAMIC_EXECUTION=0
    run_process([PYTHON, EMCC, 'test.c', '-O1', '-s', 'DYNAMIC_EXECUTION=0'])
    self.assertContained('DYNAMIC_EXECUTION=0 was set, cannot eval', run_js('a.out.js', assert_returncode=None, full_output=True, stderr=PIPE))
    try_delete('a.out.js')

    # Test that emscripten_run_script() posts a warning when -s DYNAMIC_EXECUTION=2
    run_process([PYTHON, EMCC, 'test.c', '-O1', '-s', 'DYNAMIC_EXECUTION=2'])
    self.assertContained('Warning: DYNAMIC_EXECUTION=2 was set, but calling eval in the following location:', run_js('a.out.js', assert_returncode=None, full_output=True, stderr=PIPE))
    self.assertContained('hello from script', run_js('a.out.js', assert_returncode=None, full_output=True, stderr=PIPE))
    try_delete('a.out.js')

  def test_init_file_at_offset(self):
    create_test_file('src.cpp', r'''
      #include <stdio.h>
      int main() {
        int data = 0x12345678;
        FILE *f = fopen("test.dat", "wb");
        fseek(f, 100, SEEK_CUR);
        fwrite(&data, 4, 1, f);
        fclose(f);

        int data2;
        f = fopen("test.dat", "rb");
        fread(&data2, 4, 1, f); // should read 0s, not that int we wrote at an offset
        printf("read: %d\n", data2);
        fseek(f, 0, SEEK_END);
        long size = ftell(f); // should be 104, not 4
        fclose(f);
        printf("file size is %ld\n", size);
      }
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('read: 0\nfile size is 104\n', run_js('a.out.js'))

  def test_unlink(self):
    self.do_other_test(os.path.join('other', 'unlink'))

  def test_argv0_node(self):
    create_test_file('code.cpp', r'''
#include <stdio.h>
int main(int argc, char **argv) {
  printf("I am %s.\n", argv[0]);
  return 0;
}
''')

    run_process([PYTHON, EMCC, 'code.cpp'])
    self.assertContained('I am ' + os.path.realpath(self.get_dir()).replace('\\', '/') + '/a.out.js', run_js('a.out.js', engine=NODE_JS).replace('\\', '/'))

  def test_returncode(self):
    create_test_file('src.cpp', r'''
      #include <stdio.h>
      #include <stdlib.h>
      int main() {
      #if CALL_EXIT
        exit(CODE);
      #else
        return CODE;
      #endif
      }
    ''')
    for code in [0, 123]:
      for no_exit in [0, 1]:
        for call_exit in [0, 1]:
          for async_compile in [0, 1]:
            run_process([PYTHON, EMCC, 'src.cpp', '-DCODE=%d' % code, '-s', 'EXIT_RUNTIME=%d' % (1 - no_exit), '-DCALL_EXIT=%d' % call_exit, '-s', 'WASM_ASYNC_COMPILATION=%d' % async_compile])
            for engine in JS_ENGINES:
              # async compilation can't return a code in d8
              if async_compile and engine == V8_ENGINE:
                continue
              print(code, no_exit, call_exit, async_compile, engine)
              process = run_process(engine + ['a.out.js'], stdout=PIPE, stderr=PIPE, check=False)
              # we always emit the right exit code, whether we exit the runtime or not
              assert process.returncode == code, [process.returncode, process.stdout, process.stderr]
              assert not process.stdout, process.stdout
              if not call_exit:
                assert not process.stderr, process.stderr
              assert ('but EXIT_RUNTIME is not set, so halting execution but not exiting the runtime or preventing further async execution (build with EXIT_RUNTIME=1, if you want a true shutdown)' in process.stderr) == (no_exit and call_exit), process.stderr

  def test_emscripten_force_exit_NO_EXIT_RUNTIME(self):
    create_test_file('src.cpp', r'''
      #include <emscripten.h>
      int main() {
      #if CALL_EXIT
        emscripten_force_exit(0);
      #endif
      }
    ''')
    for no_exit in [0, 1]:
      for call_exit in [0, 1]:
        run_process([PYTHON, EMCC, 'src.cpp', '-s', 'EXIT_RUNTIME=%d' % (1 - no_exit), '-DCALL_EXIT=%d' % call_exit])
        print(no_exit, call_exit)
        out = run_js('a.out.js', stdout=PIPE, stderr=PIPE, full_output=True)
        assert ('emscripten_force_exit cannot actually shut down the runtime, as the build does not have EXIT_RUNTIME set' in out) == (no_exit and call_exit), out

  def test_mkdir_silly(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char **argv) {
  printf("\n");
  for (int i = 1; i < argc; i++) {
    printf("%d:\n", i);
    int ok = mkdir(argv[i], S_IRWXU|S_IRWXG|S_IRWXO);
    printf("  make %s: %d\n", argv[i], ok);
    DIR *dir = opendir(argv[i]);
    printf("  open %s: %d\n", argv[i], dir != NULL);
    if (dir) {
      struct dirent *entry;
      while ((entry = readdir(dir))) {
        printf("  %s, %d\n", entry->d_name, entry->d_type);
      }
    }
  }
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])

    # cannot create /, can open
    self.assertContained(r'''
1:
  make /: -1
  open /: 1
  ., 4
  .., 4
  tmp, 4
  home, 4
  dev, 4
  proc, 4
''', run_js('a.out.js', args=['/']))
    # cannot create empty name, cannot open
    self.assertContained(r'''
1:
  make : -1
  open : 0
''', run_js('a.out.js', args=['']))
    # can create unnormalized path, can open
    self.assertContained(r'''
1:
  make /a//: 0
  open /a//: 1
  ., 4
  .., 4
''', run_js('a.out.js', args=['/a//']))
    # can create child unnormalized
    self.assertContained(r'''
1:
  make /a: 0
  open /a: 1
  ., 4
  .., 4
2:
  make /a//b//: 0
  open /a//b//: 1
  ., 4
  .., 4
''', run_js('a.out.js', args=['/a', '/a//b//']))

  def test_stat_silly(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>

int main(int argc, char **argv) {
  for (int i = 1; i < argc; i++) {
    const char *path = argv[i];
    struct stat path_stat;
    if (stat(path, &path_stat) != 0) {
      printf("Failed to stat path: %s; errno=%d\n", path, errno);
    } else {
      printf("ok on %s\n", path);
    }
  }
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])

    # cannot stat ""
    self.assertContained(r'''Failed to stat path: /a; errno=44
Failed to stat path: ; errno=44
''', run_js('a.out.js', args=['/a', '']))

  def test_symlink_silly(self):
    create_test_file('src.cpp', r'''
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

int main(int argc, char **argv) {
  if (symlink(argv[1], argv[2]) != 0) {
    printf("Failed to symlink paths: %s, %s; errno=%d\n", argv[1], argv[2], errno);
  } else {
    printf("ok\n");
  }
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])

    # cannot symlink nonexistents
    self.assertContained(r'''Failed to symlink paths: , abc; errno=44''', run_js('a.out.js', args=['', 'abc']))
    self.assertContained(r'''Failed to symlink paths: , ; errno=44''', run_js('a.out.js', args=['', '']))
    self.assertContained(r'''ok''', run_js('a.out.js', args=['123', 'abc']))
    self.assertContained(r'''Failed to symlink paths: abc, ; errno=44''', run_js('a.out.js', args=['abc', '']))

  def test_rename_silly(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>
#include <errno.h>

int main(int argc, char **argv) {
  if (rename(argv[1], argv[2]) != 0) {
    printf("Failed to rename paths: %s, %s; errno=%d\n", argv[1], argv[2], errno);
  } else {
    printf("ok\n");
  }
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])

    # cannot symlink nonexistents
    self.assertContained(r'''Failed to rename paths: , abc; errno=44''', run_js('a.out.js', args=['', 'abc']))
    self.assertContained(r'''Failed to rename paths: , ; errno=44''', run_js('a.out.js', args=['', '']))
    self.assertContained(r'''Failed to rename paths: 123, abc; errno=44''', run_js('a.out.js', args=['123', 'abc']))
    self.assertContained(r'''Failed to rename paths: abc, ; errno=44''', run_js('a.out.js', args=['abc', '']))

  def test_readdir_r_silly(self):
    create_test_file('src.cpp', r'''
#include <iostream>
#include <cstring>
#include <cerrno>
#include <unistd.h>
#include <fcntl.h>
#include <cstdlib>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
using std::endl;
namespace
{
  void check(const bool result)
  {
    if(not result) {
      std::cout << "Check failed!" << endl;
      throw "bad";
    }
  }
  // Do a recursive directory listing of the directory whose path is specified
  // by \a name.
  void ls(const std::string& name, std::size_t indent = 0)
  {
    ::DIR *dir;
    struct ::dirent *entry;
    if(indent == 0) {
      std::cout << name << endl;
      ++indent;
    }
    // Make sure we can open the directory.  This should also catch cases where
    // the empty string is passed in.
    if (not (dir = ::opendir(name.c_str()))) {
      const int error = errno;
      std::cout
        << "Failed to open directory: " << name << "; " << error << endl;
      return;
    }
    // Just checking the sanity.
    if (name.empty()) {
      std::cout
        << "Managed to open a directory whose name was the empty string.."
        << endl;
      check(::closedir(dir) != -1);
      return;
    }
    // Iterate over the entries in the directory.
    while ((entry = ::readdir(dir))) {
      const std::string entryName(entry->d_name);
      if (entryName == "." || entryName == "..") {
        // Skip the dot entries.
        continue;
      }
      const std::string indentStr(indent * 2, ' ');
      if (entryName.empty()) {
        std::cout
          << indentStr << "\"\": Found empty string as a "
          << (entry->d_type == DT_DIR ? "directory" : "file")
          << " entry!" << endl;
        continue;
      } else {
        std::cout << indentStr << entryName
                  << (entry->d_type == DT_DIR ? "/" : "") << endl;
      }
      if (entry->d_type == DT_DIR) {
        // We found a subdirectory; recurse.
        ls(std::string(name + (name == "/" ? "" : "/" ) + entryName),
           indent + 1);
      }
    }
    // Close our handle.
    check(::closedir(dir) != -1);
  }
  void touch(const std::string &path)
  {
    const int fd = ::open(path.c_str(), O_CREAT | O_TRUNC, 0644);
    check(fd != -1);
    check(::close(fd) != -1);
  }
}
int main()
{
  check(::mkdir("dir", 0755) == 0);
  touch("dir/a");
  touch("dir/b");
  touch("dir/c");
  touch("dir/d");
  touch("dir/e");
  std::cout << "Before:" << endl;
  ls("dir");
  std::cout << endl;
  // Attempt to delete entries as we walk the (single) directory.
  ::DIR * const dir = ::opendir("dir");
  check(dir != NULL);
  struct ::dirent *entry;
  while((entry = ::readdir(dir)) != NULL) {
    const std::string name(entry->d_name);
    // Skip "." and "..".
    if(name == "." || name == "..") {
      continue;
    }
    // Unlink it.
    std::cout << "Unlinking " << name << endl;
    check(::unlink(("dir/" + name).c_str()) != -1);
  }
  check(::closedir(dir) != -1);
  std::cout << "After:" << endl;
  ls("dir");
  std::cout << endl;
  return 0;
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '-fexceptions'])

    # cannot symlink nonexistents
    self.assertContained(r'''Before:
dir
  a
  b
  c
  d
  e

Unlinking a
Unlinking b
Unlinking c
Unlinking d
Unlinking e
After:
dir
''', run_js('a.out.js', args=['', 'abc']))

  def test_emversion(self):
    create_test_file('src.cpp', r'''
      #include <stdio.h>
      int main() {
        printf("major: %d\n", __EMSCRIPTEN_major__);
        printf("minor: %d\n", __EMSCRIPTEN_minor__);
        printf("tiny: %d\n", __EMSCRIPTEN_tiny__);
      }
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained(r'''major: %d
minor: %d
tiny: %d
''' % (shared.EMSCRIPTEN_VERSION_MAJOR, shared.EMSCRIPTEN_VERSION_MINOR, shared.EMSCRIPTEN_VERSION_TINY), run_js('a.out.js'))

  def test_libc_files_without_syscalls(self):
    # a program which includes FS due to libc js library support, but has no syscalls,
    # so full FS support would normally be optimized out
    create_test_file('src.cpp', r'''
#include <sys/time.h>
#include <stddef.h>
int main() {
    return utimes(NULL, NULL);
}''')
    run_process([PYTHON, EMCC, 'src.cpp'])

  def test_syscall_without_filesystem(self):
    # a program which includes a non-trivial syscall, but disables the filesystem.
    create_test_file('src.c', r'''
#include <sys/time.h>
#include <stddef.h>
extern int __syscall295(int);
int main() {
  return __syscall295(0);
}''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'NO_FILESYSTEM=1'])

  def test_dashS(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-S'])
    self.assertExists('hello_world.s')

  def test_dashS_stdout(self):
    stdout = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-S', '-o', '-'], stdout=PIPE).stdout
    self.assertEqual(os.listdir('.'), [])
    self.assertContained('hello_world.c', stdout)

  def test_emit_llvm(self):
    # TODO(https://github.com/emscripten-core/emscripten/issues/9016):
    # We shouldn't need to copy the file here but if we don't then emcc will
    # internally clobber the hello_world.ll in tests.
    shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'hello_world.c')
    run_process([PYTHON, EMCC, 'hello_world.c', '-S', '-emit-llvm'])
    self.assertExists('hello_world.ll')
    bitcode = open('hello_world.ll').read()
    self.assertContained('target triple = "', bitcode)

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-c', '-emit-llvm'])
    self.assertTrue(Building.is_bitcode('hello_world.bc'))

  def test_dashE(self):
    create_test_file('src.cpp', r'''#include <emscripten.h>
__EMSCRIPTEN_major__ __EMSCRIPTEN_minor__ __EMSCRIPTEN_tiny__ EMSCRIPTEN_KEEPALIVE
''')

    def test(args=[]):
      print(args)
      out = run_process([PYTHON, EMCC, 'src.cpp', '-E'] + args, stdout=PIPE).stdout
      self.assertContained('%d %d %d __attribute__((used))' % (shared.EMSCRIPTEN_VERSION_MAJOR, shared.EMSCRIPTEN_VERSION_MINOR, shared.EMSCRIPTEN_VERSION_TINY), out)

    test()
    test(['--bind'])

  def test_dashE_respect_dashO(self):
    # issue #3365
    null_file = 'NUL' if WINDOWS else '/dev/null'
    with_dash_o = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-E', '-o', null_file], stdout=PIPE, stderr=PIPE).stdout
    if WINDOWS:
      self.assertNotExists(null_file)
    without_dash_o = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-E'], stdout=PIPE, stderr=PIPE).stdout
    self.assertEqual(len(with_dash_o), 0)
    self.assertNotEqual(len(without_dash_o), 0)

  def test_dashM(self):
    out = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-M'], stdout=PIPE).stdout
    self.assertContained('hello_world.o:', out) # Verify output is just a dependency rule instead of bitcode or js

  def test_dashM_respect_dashO(self):
    null_file = 'NUL' if WINDOWS else '/dev/null'
    with_dash_o = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-M', '-o', null_file], stdout=PIPE).stdout
    if WINDOWS:
      self.assertNotExists(null_file)
    without_dash_o = run_process([PYTHON, EMXX, path_from_root('tests', 'hello_world.cpp'), '-M'], stdout=PIPE).stdout
    self.assertEqual(len(with_dash_o), 0)
    self.assertNotEqual(len(without_dash_o), 0)

  def test_malloc_implicit(self):
    self.do_other_test(os.path.join('other', 'malloc_implicit'))

  def test_switch64phi(self):
    # issue 2539, fastcomp segfault on phi-i64 interaction
    create_test_file('src.cpp', r'''
#include <cstdint>
#include <limits>
#include <cstdio>

//============================================================================

namespace
{
  class int_adapter {
  public:
    typedef ::int64_t int_type;

    int_adapter(int_type v = 0)
      : value_(v)
    {}
    static const int_adapter pos_infinity()
    {
      return (::std::numeric_limits<int_type>::max)();
    }
    static const int_adapter neg_infinity()
    {
      return (::std::numeric_limits<int_type>::min)();
    }
    static const int_adapter not_a_number()
    {
      return (::std::numeric_limits<int_type>::max)()-1;
    }
    static bool is_neg_inf(int_type v)
    {
      return (v == neg_infinity().as_number());
    }
    static bool is_pos_inf(int_type v)
    {
      return (v == pos_infinity().as_number());
    }
    static bool is_not_a_number(int_type v)
    {
      return (v == not_a_number().as_number());
    }

    bool is_infinity() const
    {
      return (value_ == neg_infinity().as_number() ||
              value_ == pos_infinity().as_number());
    }
    bool is_special() const
    {
      return(is_infinity() || value_ == not_a_number().as_number());
    }
    bool operator<(const int_adapter& rhs) const
    {
      if(value_ == not_a_number().as_number()
         || rhs.value_ == not_a_number().as_number()) {
        return false;
      }
      if(value_ < rhs.value_) return true;
      return false;
    }
    int_type as_number() const
    {
      return value_;
    }

    int_adapter operator-(const int_adapter& rhs)const
    {
      if(is_special() || rhs.is_special())
      {
        if (rhs.is_pos_inf(rhs.as_number()))
        {
          return int_adapter(1);
        }
        if (rhs.is_neg_inf(rhs.as_number()))
        {
          return int_adapter();
        }
      }
      return int_adapter();
    }


  private:
    int_type value_;
  };

  class time_iterator {
  public:
    time_iterator(int_adapter t, int_adapter d)
      : current_(t),
        offset_(d)
    {}

    time_iterator& operator--()
    {
      current_ = int_adapter(current_ - offset_);
      return *this;
    }

    bool operator>=(const int_adapter& t)
    {
      return not (current_ < t);
    }

  private:
    int_adapter current_;
    int_adapter offset_;
  };

  void iterate_backward(const int_adapter *answers, const int_adapter& td)
  {
    int_adapter end = answers[0];
    time_iterator titr(end, td);

    std::puts("");
    for (; titr >= answers[0]; --titr) {
    }
  }
}

int
main()
{
  const int_adapter answer1[] = {};
  iterate_backward(NULL, int_adapter());
  iterate_backward(answer1, int_adapter());
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '-O2', '-s', 'SAFE_HEAP=1'])

  def test_only_force_stdlibs(self):
    def test(name, fail=False):
      print(name)
      run_process([PYTHON, EMXX, path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0'])
      if fail:
        proc = run_process(NODE_JS + ['a.out.js'], stdout=PIPE, stderr=PIPE, check=False)
        self.assertNotEqual(proc.returncode, 0)
      else:
        self.assertContained('hello, world!', run_js('a.out.js', stderr=PIPE))

    with env_modify({'EMCC_FORCE_STDLIBS': None}):
      test('normal') # normally is ok

    with env_modify({'EMCC_FORCE_STDLIBS': 'libc,libc++abi,libc++'}):
      test('forced libs is ok, they were there anyhow')

    with env_modify({'EMCC_FORCE_STDLIBS': 'libc'}):
      test('partial list, but ok since we grab them as needed')

    with env_modify({'EMCC_FORCE_STDLIBS': 'libc++', 'EMCC_ONLY_FORCED_STDLIBS': '1'}):
      test('fail! not enough stdlibs', fail=True)

    with env_modify({'EMCC_FORCE_STDLIBS': 'libc,libc++abi,libc++,libpthread', 'EMCC_ONLY_FORCED_STDLIBS': '1'}):
      test('force all the needed stdlibs, so this works even though we ignore the input file')

  def test_only_force_stdlibs_2(self):
    create_test_file('src.cpp', r'''
#include <iostream>
#include <stdexcept>

int main()
{
  try {
    throw std::exception();
    std::cout << "got here" << std::endl;
  }
  catch (const std::exception& ex) {
    std::cout << "Caught exception: " << ex.what() << std::endl;
  }
}
''')
    with env_modify({'EMCC_FORCE_STDLIBS': 'libc,libc++abi,libc++,libmalloc,libpthread', 'EMCC_ONLY_FORCED_STDLIBS': '1'}):
      run_process([PYTHON, EMXX, 'src.cpp', '-s', 'DISABLE_EXCEPTION_CATCHING=0'])
    self.assertContained('Caught exception: std::exception', run_js('a.out.js', stderr=PIPE))

  def test_strftime_zZ(self):
    create_test_file('src.cpp', r'''
#include <cerrno>
#include <cstring>
#include <ctime>
#include <iostream>

int main()
{
  // Buffer to hold the current hour of the day.  Format is HH + nul
  // character.
  char hour[3];

  // Buffer to hold our ISO 8601 formatted UTC offset for the current
  // timezone.  Format is [+-]hhmm + nul character.
  char utcOffset[6];

  // Buffer to hold the timezone name or abbreviation.  Just make it
  // sufficiently large to hold most timezone names.
  char timezone[128];

  std::tm tm;

  // Get the current timestamp.
  const std::time_t now = std::time(NULL);

  // What time is that here?
  if (::localtime_r(&now, &tm) == NULL) {
    const int error = errno;
    std::cout
      << "Failed to get localtime for timestamp=" << now << "; errno=" << error
      << "; " << std::strerror(error) << std::endl;
    return 1;
  }

  size_t result = 0;

  // Get the formatted hour of the day.
  if ((result = std::strftime(hour, 3, "%H", &tm)) != 2) {
    const int error = errno;
    std::cout
      << "Failed to format hour for timestamp=" << now << "; result="
      << result << "; errno=" << error << "; " << std::strerror(error)
      << std::endl;
    return 1;
  }
  std::cout << "The current hour of the day is: " << hour << std::endl;

  // Get the formatted UTC offset in ISO 8601 format.
  if ((result = std::strftime(utcOffset, 6, "%z", &tm)) != 5) {
    const int error = errno;
    std::cout
      << "Failed to format UTC offset for timestamp=" << now << "; result="
      << result << "; errno=" << error << "; " << std::strerror(error)
      << std::endl;
    return 1;
  }
  std::cout << "The current timezone offset is: " << utcOffset << std::endl;

  // Get the formatted timezone name or abbreviation.  We don't know how long
  // this will be, so just expect some data to be written to the buffer.
  if ((result = std::strftime(timezone, 128, "%Z", &tm)) == 0) {
    const int error = errno;
    std::cout
      << "Failed to format timezone for timestamp=" << now << "; result="
      << result << "; errno=" << error << "; " << std::strerror(error)
      << std::endl;
    return 1;
  }
  std::cout << "The current timezone is: " << timezone << std::endl;

  std::cout << "ok!\n";
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('ok!', run_js('a.out.js'))

  def test_strptime_symmetry(self):
    Building.emcc(path_from_root('tests', 'strptime_symmetry.cpp'), output_filename='a.out.js')
    self.assertContained('TEST PASSED', run_js('a.out.js'))

  def test_truncate_from_0(self):
    create_test_file('src.cpp', r'''
#include <cerrno>
#include <cstring>
#include <iostream>

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

using std::endl;

//============================================================================
// :: Helpers

namespace
{
  // Returns the size of the regular file specified as 'path'.
  ::off_t getSize(const char* const path)
  {
    // Stat the file and make sure that it's the expected size.
    struct ::stat path_stat;
    if (::stat(path, &path_stat) != 0) {
      const int error = errno;
      std::cout
        << "Failed to lstat path: " << path << "; errno=" << error << "; "
        << std::strerror(error) << endl;
      return -1;
    }

    std::cout
      << "Size of file is: " << path_stat.st_size << endl;
    return path_stat.st_size;
  }

  // Causes the regular file specified in 'path' to have a size of 'length'
  // bytes.
  void resize(const char* const path,
              const ::off_t length)
  {
    std::cout
      << "Truncating file=" << path << " to length=" << length << endl;
    if (::truncate(path, length) == -1)
    {
      const int error = errno;
      std::cout
        << "Failed to truncate file=" << path << "; errno=" << error
        << "; " << std::strerror(error) << endl;
    }

    const ::off_t size = getSize(path);
    if (size != length) {
      std::cout
        << "Failed to truncate file=" << path << " to length=" << length
        << "; got size=" << size << endl;
    }
  }

  // Helper to create a file with the given content.
  void createFile(const std::string& path, const std::string& content)
  {
    std::cout
      << "Creating file: " << path << " with content=" << content << endl;

    const int fd = ::open(path.c_str(), O_CREAT | O_WRONLY, 0644);
    if (fd == -1) {
      const int error = errno;
      std::cout
        << "Failed to open file for writing: " << path << "; errno=" << error
        << "; " << std::strerror(error) << endl;
      return;
    }

    if (::write(fd, content.c_str(), content.size()) != content.size()) {
      const int error = errno;
      std::cout
        << "Failed to write content=" << content << " to file=" << path
        << "; errno=" << error << "; " << std::strerror(error) << endl;

      // Fall through to close FD.
    }

    ::close(fd);
  }
}

//============================================================================
// :: Entry Point
int main()
{
  const char* const file = "/tmp/file";
  createFile(file, "This is some content");
  getSize(file);
  resize(file, 32);
  resize(file, 17);
  resize(file, 0);

  // This throws a JS exception.
  resize(file, 32);
  return 0;
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained(r'''Creating file: /tmp/file with content=This is some content
Size of file is: 20
Truncating file=/tmp/file to length=32
Size of file is: 32
Truncating file=/tmp/file to length=17
Size of file is: 17
Truncating file=/tmp/file to length=0
Size of file is: 0
Truncating file=/tmp/file to length=32
Size of file is: 32
''', run_js('a.out.js'))

  def test_emcc_s_typo(self):
    # with suggestions
    stderr = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'DISABLE_EXCEPTION_CATCH=1'])
    self.assertContained('Assigning a non-existent settings attribute "DISABLE_EXCEPTION_CATCH"', stderr)
    self.assertContained('did you mean one of DISABLE_EXCEPTION_CATCHING', stderr)
    # no suggestions
    stderr = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'CHEEZ=1'])
    self.assertContained("perhaps a typo in emcc\'s  -s X=Y  notation?", stderr)
    self.assertContained('(see src/settings.js for valid values)', stderr)

  def test_create_readonly(self):
    create_test_file('src.cpp', r'''
#include <cerrno>
#include <cstring>
#include <iostream>

#include <fcntl.h>
#include <unistd.h>

using std::endl;

//============================================================================
// :: Helpers

namespace
{
  // Helper to create a read-only file with content.
  void readOnlyFile(const std::string& path, const std::string& content)
  {
    std::cout
      << "Creating file: " << path << " with content of size="
      << content.size() << endl;

    const int fd = ::open(path.c_str(), O_CREAT | O_WRONLY, 0400);
    if (fd == -1) {
      const int error = errno;
      std::cout
        << "Failed to open file for writing: " << path << "; errno=" << error
        << "; " << std::strerror(error) << endl;
      return;
    }

    // Write the content to the file.
    ssize_t result = 0;
    if ((result = ::write(fd, content.data(), content.size()))
        != ssize_t(content.size()))
    {
      const int error = errno;
      std::cout
        << "Failed to write to file=" << path << "; errno=" << error
        << "; " << std::strerror(error) << endl;
      // Fall through to close the file.
    }
    else {
      std::cout
        << "Data written to file=" << path << "; successfully wrote "
        << result << " bytes" << endl;
    }

    ::close(fd);
  }
}

//============================================================================
// :: Entry Point

int main()
{
  const char* const file = "/tmp/file";
  unlink(file);
  readOnlyFile(file, "This content should get written because the file "
                     "does not yet exist and so, only the mode of the "
                     "containing directory will influence my ability to "
                     "create and open the file. The mode of the file only "
                     "applies to opening of the stream, not subsequent stream "
                     "operations after stream has opened.\n\n");
  readOnlyFile(file, "This should not get written because the file already "
                     "exists and is read-only.\n\n");
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained(r'''Creating file: /tmp/file with content of size=292
Data written to file=/tmp/file; successfully wrote 292 bytes
Creating file: /tmp/file with content of size=79
Failed to open file for writing: /tmp/file; errno=2; Permission denied
''', run_js('a.out.js'))

  def test_embed_file_large(self):
    # If such long files are encoded on one line,
    # they overflow the interpreter's limit
    large_size = int(1500000)
    create_test_file('large.txt', 'x' * large_size)
    create_test_file('src.cpp', r'''
      #include <stdio.h>
      #include <unistd.h>
      int main()
      {
          FILE* fp = fopen("large.txt", "r");
          if (fp) {
              printf("ok\n");
              fseek(fp, 0L, SEEK_END);
              printf("%ld\n", ftell(fp));
          } else {
              printf("failed to open large file.txt\n");
          }
          return 0;
      }
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '--embed-file', 'large.txt'])
    for engine in JS_ENGINES:
      if engine == V8_ENGINE:
        continue # ooms
      print(engine)
      self.assertContained('ok\n' + str(large_size) + '\n', run_js('a.out.js', engine=engine))

  def test_force_exit(self):
    create_test_file('src.cpp', r'''
#include <emscripten/emscripten.h>

namespace
{
  extern "C"
  EMSCRIPTEN_KEEPALIVE
  void callback()
  {
    EM_ASM({ out('callback pre()') });
    ::emscripten_force_exit(42);
    EM_ASM({ out('callback post()') });
    }
}

int
main()
{
  EM_ASM({ setTimeout(function() { out("calling callback()"); _callback() }, 100) });
  ::emscripten_exit_with_live_runtime();
  return 123;
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    output = run_js('a.out.js', engine=NODE_JS, assert_returncode=42)
    assert 'callback pre()' in output
    assert 'callback post()' not in output

  def test_bad_locale(self):
    create_test_file('src.cpp', r'''

#include <locale.h>
#include <stdio.h>
#include <wctype.h>

int
main(const int argc, const char * const * const argv)
{
  const char * const locale = (argc > 1 ? argv[1] : "C");
  const char * const actual = setlocale(LC_ALL, locale);
  if(actual == NULL) {
    printf("%s locale not supported\n",
           locale);
    return 0;
  }
  printf("locale set to %s: %s\n", locale, actual);
}

    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])

    self.assertContained('locale set to C: C;C;C;C;C;C',
                         run_js('a.out.js', args=['C']))
    self.assertContained('locale set to waka: waka;waka;waka;waka;waka;waka',
                         run_js('a.out.js', args=['waka']))

  def test_browser_language_detection(self):
    # Test HTTP Accept-Language parsing by simulating navigator.languages #8751
    run_process([PYTHON, EMCC,
                 path_from_root('tests', 'test_browser_language_detection.c')])
    self.assertContained('C.UTF-8', run_js('a.out.js'))

    # Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
    create_test_file('preamble.js', r'''navigator = {};
      navigator.languages = [ "fr", "fr-FR", "en-US", "en" ];''')
    run_process([PYTHON, EMCC, '--pre-js', 'preamble.js',
                 path_from_root('tests', 'test_browser_language_detection.c')])
    self.assertContained('fr.UTF-8', run_js('a.out.js'))

    # Accept-Language: fr-FR,fr;q=0.8,en-US;q=0.5,en;q=0.3
    create_test_file('preamble.js', r'''navigator = {};
      navigator.languages = [ "fr-FR", "fr", "en-US", "en" ];''')
    run_process([PYTHON, EMCC, '--pre-js', 'preamble.js',
                 path_from_root('tests', 'test_browser_language_detection.c')])
    self.assertContained('fr_FR.UTF-8', run_js('a.out.js'))

  def test_js_main(self):
    # try to add a main() from JS, at runtime. this is not supported (the
    # compiler needs to know at compile time about main).
    create_test_file('pre_main.js', r'''
      var Module = {
        '_main': function() {
        }
      };
    ''')
    create_test_file('src.cpp', '')
    run_process([PYTHON, EMCC, 'src.cpp', '--pre-js', 'pre_main.js'])
    self.assertContained('compiled without a main, but one is present. if you added it from JS, use Module["onRuntimeInitialized"]',
                         run_js('a.out.js', assert_returncode=None, stderr=PIPE))

  def test_js_malloc(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>
#include <emscripten.h>

int main() {
  EM_ASM({
    for (var i = 0; i < 1000; i++) {
      var ptr = Module._malloc(1024 * 1024); // only done in JS, but still must not leak
      Module._free(ptr);
    }
  });
  printf("ok.\n");
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('ok.', run_js('a.out.js', args=['C']))

  def test_locale_wrong(self):
    create_test_file('src.cpp', r'''
#include <locale>
#include <iostream>
#include <stdexcept>

int
main(const int argc, const char * const * const argv)
{
  const char * const name = argc > 1 ? argv[1] : "C";

  try {
    const std::locale locale(name);
    std::cout
      << "Constructed locale \"" << name << "\"\n"
      << "This locale is "
      << (locale == std::locale::global(locale) ? "" : "not ")
      << "the global locale.\n"
      << "This locale is " << (locale == std::locale::classic() ? "" : "not ")
      << "the C locale." << std::endl;

  } catch(const std::runtime_error &ex) {
    std::cout
      << "Can't construct locale \"" << name << "\": " << ex.what()
      << std::endl;
    return 1;

  } catch(...) {
    std::cout
      << "FAIL: Unexpected exception constructing locale \"" << name << '\"'
      << std::endl;
    return 127;
  }
}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'EXIT_RUNTIME=1', '-s', 'DISABLE_EXCEPTION_CATCHING=0'])
    self.assertContained('Constructed locale "C"\nThis locale is the global locale.\nThis locale is the C locale.', run_js('a.out.js', args=['C']))
    self.assertContained('''Can't construct locale "waka": collate_byname<char>::collate_byname failed to construct for waka''', run_js('a.out.js', args=['waka'], assert_returncode=1))

  def test_cleanup_os(self):
    # issue 2644
    def test(args, be_clean):
      print(args)
      self.clear()
      shutil.copyfile(path_from_root('tests', 'hello_world.c'), 'a.c')
      create_test_file('b.c', ' ')
      run_process([PYTHON, EMCC, 'a.c', 'b.c'] + args)
      clutter = glob.glob('*.o')
      if be_clean:
        assert len(clutter) == 0, 'should not leave clutter ' + str(clutter)
      else:
         assert len(clutter) == 2, 'should leave .o files'
    test(['-o', 'c.bc'], True)
    test(['-o', 'c.js'], True)
    test(['-o', 'c.html'], True)
    test(['-c'], False)

  @no_wasm_backend('asm.js debug info')
  def test_js_dash_g(self):
    create_test_file('src.c', '''
      #include <stdio.h>
      #include <assert.h>

      void checker(int x) {
        x += 20;
        assert(x < 15); // this is line 7!
      }

      int main() {
        checker(10);
        return 0;
      }
    ''')

    def check(has):
      print(has)
      lines = open('a.out.js').readlines()
      lines = [line for line in lines if '___assert_fail(' in line or '___assert_func(' in line]
      found_line_num = any(('//@line 7 "' in line) for line in lines)
      found_filename = any(('src.c"\n' in line) for line in lines)
      assert found_line_num == has, 'Must have debug info with the line number'
      assert found_filename == has, 'Must have debug info with the filename'

    run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c', '-g'])
    check(True)
    run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c'])
    check(False)
    run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c', '-g0'])
    check(False)
    run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c', '-g0', '-g']) # later one overrides
    check(True)
    run_process([PYTHON, EMCC, '-s', 'WASM=0', 'src.c', '-g', '-g0']) # later one overrides
    check(False)

  def test_dash_g_bc(self):
    def test(opts):
      print(opts)
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'a_.bc'] + opts)
      sizes = {'_': os.path.getsize('a_.bc')}
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-g', '-o', 'ag.bc'] + opts)
      sizes['g'] = os.path.getsize('ag.bc')
      for i in range(0, 5):
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-g' + str(i), '-o', 'a' + str(i) + '.bc'] + opts)
        sizes[i] = os.path.getsize('a' + str(i) + '.bc')
      print('  ', sizes)
      assert sizes['_'] == sizes[0] == sizes[1] == sizes[2] == sizes[3], 'no debug or <4 debug, means no llvm debug info ' + str(sizes)
      assert sizes['g'] == sizes[4], '-g or -g4 means llvm debug info ' + str(sizes)
      assert sizes['_'] < sizes['g'], 'llvm debug info has positive size ' + str(sizes)
    test([])
    test(['-O1'])

  def test_no_filesystem(self):
    FS_MARKER = 'var FS'
    # fopen forces full filesystem support
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world_fopen.c'), '-s', 'ASSERTIONS=0'])
    yes_size = os.path.getsize('a.out.js')
    self.assertContained('hello, world!', run_js('a.out.js'))
    self.assertContained(FS_MARKER, open('a.out.js').read())
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'ASSERTIONS=0'])
    no_size = os.path.getsize('a.out.js')
    self.assertContained('hello, world!', run_js('a.out.js'))
    self.assertNotContained(FS_MARKER, open('a.out.js').read())
    print('yes fs, no fs:', yes_size, no_size)
    # 100K of FS code is removed
    self.assertGreater(yes_size - no_size, 100000)
    self.assertLess(no_size, 360000)

  def test_no_filesystem_libcxx(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'FILESYSTEM=0'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_no_nuthin(self):
    # check FILESYSTEM is automatically set, and effective

    def test(opts, absolute):
      print('opts, absolute:', opts, absolute)
      sizes = {}

      def do(name, source, moar_opts):
        self.clear()
        # pad the name to a common length so that doesn't effect the size of the
        # output
        padded_name = name + '_' * (20 - len(name))
        run_process([PYTHON, EMCC, path_from_root('tests', source), '-o', padded_name + '.js'] + opts + moar_opts)
        sizes[name] = os.path.getsize(padded_name + '.js')
        if os.path.exists(padded_name + '.wasm'):
          sizes[name] += os.path.getsize(padded_name + '.wasm')
        self.assertContained('hello, world!', run_js(padded_name + '.js'))

      do('normal', 'hello_world_fopen.c', [])
      do('no_fs', 'hello_world.c', []) # without fopen, we should auto-detect we do not need full fs support and can do FILESYSTEM=0
      do('no_fs_manual', 'hello_world.c', ['-s', 'FILESYSTEM=0'])
      print('  ', sizes)
      self.assertLess(sizes['no_fs'], sizes['normal'])
      self.assertLess(sizes['no_fs'], absolute)
      # manual can usually remove a tiny bit more
      self.assertLess(sizes['no_fs_manual'], sizes['no_fs'] + 30)

    test(['-s', 'ASSERTIONS=0'], 120000) # we don't care about code size with assertions
    test(['-O1'], 91000)
    test(['-O2'], 46000)
    test(['-O3', '--closure', '1'], 17000)
    # asm.js too
    if not self.is_wasm_backend():
      test(['-O3', '--closure', '1', '-s', 'WASM=0'], 36000)
      test(['-O3', '--closure', '2', '-s', 'WASM=0'], 33000) # might change now and then

  def test_no_browser(self):
    BROWSER_INIT = 'var Browser'

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])
    self.assertNotContained(BROWSER_INIT, open('a.out.js').read())

    run_process([PYTHON, EMCC, path_from_root('tests', 'browser_main_loop.c')]) # uses emscripten_set_main_loop, which needs Browser
    self.assertContained(BROWSER_INIT, open('a.out.js').read())

  def test_EXPORTED_RUNTIME_METHODS(self):
    def test(opts, has, not_has):
      print(opts, has, not_has)
      self.clear()
      # check without assertions, as with assertions we add stubs for the things we remove (which
      # print nice error messages)
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'ASSERTIONS=0'] + opts)
      self.assertContained('hello, world!', run_js('a.out.js'))
      src = open('a.out.js').read()
      self.assertContained(has, src)
      self.assertNotContained(not_has, src)

    test([], 'Module["', 'Module["waka')
    test(['-s', 'EXPORTED_RUNTIME_METHODS=[]'], '', 'Module["addRunDependency')
    test(['-s', 'EXPORTED_RUNTIME_METHODS=["addRunDependency"]'], 'Module["addRunDependency', 'Module["waka')
    test(['-s', 'EXPORTED_RUNTIME_METHODS=[]', '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["addRunDependency"]'], 'Module["addRunDependency', 'Module["waka')

  def test_stat_fail_alongtheway(self):
    create_test_file('src.cpp', r'''
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>

#define CHECK(expression) \
  if(!(expression)) {                            \
    error = errno;                               \
    printf("FAIL: %s\n", #expression); fail = 1; \
  } else {                                       \
    error = errno;                               \
    printf("pass: %s\n", #expression);           \
  }                                              \

int
main()
{
  int error;
  int fail = 0;
  CHECK(mkdir("path", 0777) == 0);
  CHECK(close(open("path/file", O_CREAT | O_WRONLY, 0644)) == 0);
  {
    struct stat st;
    CHECK(stat("path", &st) == 0);
    CHECK(st.st_mode = 0777);
  }
  {
    struct stat st;
    CHECK(stat("path/nosuchfile", &st) == -1);
    printf("info: errno=%d %s\n", error, strerror(error));
    CHECK(error == ENOENT);
  }
  {
    struct stat st;
    CHECK(stat("path/file", &st) == 0);
    CHECK(st.st_mode = 0666);
  }
  {
    struct stat st;
    CHECK(stat("path/file/impossible", &st) == -1);
    printf("info: errno=%d %s\n", error, strerror(error));
    CHECK(error == ENOTDIR);
  }
  {
    struct stat st;
    CHECK(lstat("path/file/impossible", &st) == -1);
    printf("info: errno=%d %s\n", error, strerror(error));
    CHECK(error == ENOTDIR);
  }
  return fail;
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained(r'''pass: mkdir("path", 0777) == 0
pass: close(open("path/file", O_CREAT | O_WRONLY, 0644)) == 0
pass: stat("path", &st) == 0
pass: st.st_mode = 0777
pass: stat("path/nosuchfile", &st) == -1
info: errno=44 No such file or directory
pass: error == ENOENT
pass: stat("path/file", &st) == 0
pass: st.st_mode = 0666
pass: stat("path/file/impossible", &st) == -1
info: errno=54 Not a directory
pass: error == ENOTDIR
pass: lstat("path/file/impossible", &st) == -1
info: errno=54 Not a directory
pass: error == ENOTDIR
''', run_js('a.out.js'))

  @no_wasm_backend("uses EMTERPRETIFY")
  @unittest.skipIf(SPIDERMONKEY_ENGINE not in JS_ENGINES, 'requires SpiderMonkey')
  def test_emterpreter(self):
    def do_emcc_test(source, args, output, emcc_args=[]):
      print()
      print('emcc', source[:40], '\n' in source)
      try_delete('a.out.js')
      if '\n' in source:
        create_test_file('src.cpp', source)
        source = 'src.cpp'
      else:
        source = path_from_root('tests', source)
      run_process([PYTHON, EMCC, source, '-O2', '-s', 'EMTERPRETIFY=1', '-g2', '-s', 'WASM=0'] + emcc_args)
      self.assertTextDataContained(output, run_js('a.out.js', args=args))
      out = run_js('a.out.js', engine=SPIDERMONKEY_ENGINE, args=args, stderr=PIPE, full_output=True)
      self.assertTextDataContained(output, out)
      self.validate_asmjs(out)
      # -g2 enables these
      src = open('a.out.js').read()
      assert 'function emterpret' in src, 'emterpreter should exist'
      # and removing calls to the emterpreter break, so it was being used
      out1 = run_js('a.out.js', args=args)
      assert output in out1
      create_test_file('a.out.js', src.replace('function emterpret', 'function do_not_find_me'))
      out2 = run_js('a.out.js', args=args, stderr=PIPE, assert_returncode=None)
      assert output not in out2, out2
      assert out1 != out2

    def do_test(source, args, output):
      print()
      print('emcc', source.replace('\n', '.')[:40], '\n' in source)
      self.clear()
      if '\n' in source:
        create_test_file('src.cpp', source)
        source = 'src.cpp'
      else:
        source = path_from_root('tests', source)
      run_process([PYTHON, EMCC, source, '-O2', '--profiling', '-s', 'FINALIZE_ASM_JS=0', '-s', 'GLOBAL_BASE=2048', '-s', 'ALLOW_MEMORY_GROWTH=0', '-s', 'WASM=0'])
      run_process([PYTHON, path_from_root('tools', 'emterpretify.py'), 'a.out.js', 'em.out.js', 'ASYNC=0'])
      self.assertTextDataContained(output, run_js('a.out.js', args=args))
      self.assertTextDataContained(output, run_js('em.out.js', args=args))
      out = run_js('em.out.js', engine=SPIDERMONKEY_ENGINE, args=args, stderr=PIPE, full_output=True)
      self.assertTextDataContained(output, out)

    # generate default shell for js test
    def make_default(args=[]):
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O2', '--profiling', '-s', 'FINALIZE_ASM_JS=0', '-s', 'GLOBAL_BASE=2048', '-s', 'WASM=0'] + args)
      default = open('a.out.js').read()
      start = default.index('function _main(')
      end = default.index('}', start)
      default = default[:start] + '{{{MAIN}}}' + default[end + 1:]
      default_mem = open('a.out.js.mem', 'rb').read()
      return default, default_mem
    default, default_mem = make_default()
    default_float, default_float_mem = make_default(['-s', 'PRECISE_F32=1'])

    def do_js_test(name, source, args, output, floaty=False):
      print()
      print('js', name)
      self.clear()
      if '\n' not in source:
        source = open(source).read()
      the_default = default if not floaty else default_float
      the_default_mem = default_mem if not floaty else default_float_mem
      source = the_default.replace('{{{MAIN}}}', source)
      create_test_file('a.out.js', source)
      open('a.out.js.mem', 'wb').write(the_default_mem)
      run_process([PYTHON, path_from_root('tools', 'emterpretify.py'), 'a.out.js', 'em.out.js', 'ASYNC=0'])
      sm_no_warn = [x for x in SPIDERMONKEY_ENGINE if x != '-w']
      self.assertTextDataContained(output, run_js('a.out.js', engine=sm_no_warn, args=args)) # run in spidermonkey for print()
      self.assertTextDataContained(output, run_js('em.out.js', engine=sm_no_warn, args=args))

    do_emcc_test('hello_world.c', [], 'hello, world!')

    do_test('hello_world.c', [], 'hello, world!')
    do_test('hello_world_loop.cpp', [], 'hello, world!')
    do_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.')

    print('profiling')

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-g2'])
    normal = open('a.out.js').read()
    shutil.copyfile('a.out.js', 'last.js')
    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-g2', '--profiling'])
    profiling = open('a.out.js').read()
    assert len(profiling) > len(normal) + 250, [len(profiling), len(normal)] # should be much larger

    print('blacklisting')

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', [])
    src = open('a.out.js').read()
    assert 'emterpret' in self.get_func(src, '_main'), 'main is emterpreted'
    assert 'function _atoi(' not in src, 'atoi is emterpreted and does not even have a trampoline, since only other emterpreted can reach it'

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_BLACKLIST=["_main"]']) # blacklist main
    src = open('a.out.js').read()
    assert 'emterpret' not in self.get_func(src, '_main'), 'main is NOT emterpreted, it was  blacklisted'
    assert 'emterpret' in self.get_func(src, '_atoi'), 'atoi is emterpreted'

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_BLACKLIST=["_main", "_atoi"]']) # blacklist main and atoi
    src = open('a.out.js').read()
    assert 'emterpret' not in self.get_func(src, '_main'), 'main is NOT emterpreted, it was  blacklisted'
    assert 'emterpret' not in self.get_func(src, '_atoi'), 'atoi is NOT emterpreted either'

    create_test_file('blacklist.txt', '["_main", "_atoi"]')
    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_BLACKLIST=@blacklist.txt']) # blacklist main and atoi with a @response file
    src = open('a.out.js').read()
    assert 'emterpret' not in self.get_func(src, '_main'), 'main is NOT emterpreted, it was  blacklisted'
    assert 'emterpret' not in self.get_func(src, '_atoi'), 'atoi is NOT emterpreted either'

    print('whitelisting')

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_WHITELIST=[]'])
    src = open('a.out.js').read()
    assert 'emterpret' in self.get_func(src, '_main'), 'main is emterpreted'
    assert 'function _atoi(' not in src, 'atoi is emterpreted and does not even have a trampoline, since only other emterpreted can reach it'

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_WHITELIST=["_main"]'])
    src = open('a.out.js').read()
    assert 'emterpret' in self.get_func(src, '_main')
    assert 'emterpret' not in self.get_func(src, '_atoi'), 'atoi is not in whitelist, so it is not emterpreted'

    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_WHITELIST=["_main", "_atoi"]'])
    src = open('a.out.js').read()
    assert 'emterpret' in self.get_func(src, '_main')
    assert 'function _atoi(' not in src, 'atoi is emterpreted and does not even have a trampoline, since only other emterpreted can reach it'

    create_test_file('whitelist.txt', '["_main"]')
    do_emcc_test('fannkuch.cpp', ['5'], 'Pfannkuchen(5) = 7.', ['-s', 'EMTERPRETIFY_WHITELIST=@whitelist.txt'])
    src = open('a.out.js').read()
    assert 'emterpret' in self.get_func(src, '_main')
    assert 'emterpret' not in self.get_func(src, '_atoi'), 'atoi is not in whitelist, so it is not emterpreted'

    do_test(r'''
#include <stdio.h>

int main() {
  volatile float f;
  volatile float *ff = &f;
  *ff = -10;
  printf("hello, world! %d\n", (int)f);
  return 0;
}
''', [], 'hello, world! -10')

    do_test(r'''
#include <stdio.h>

int main() {
  volatile float f;
  volatile float *ff = &f;
  *ff = -10;
  printf("hello, world! %.2f\n", f);
  return 0;
}
''', [], 'hello, world! -10.00')

    do_js_test('float', r'''
function _main() {
  var f = f0;
  f = f0 + f0;
  print(f);
}
''', [], '0\n', floaty=True)

    do_js_test('conditionals', r'''
function _main() {
 var i8 = 0;
 var d10 = +d10, d11 = +d11, d7 = +d7, d5 = +d5, d6 = +d6, d9 = +d9;
 d11 = +1;
 d7 = +2;
 d5 = +3;
 d6 = +4;
 d10 = d11 < d7 ? d11 : d7;
 print(d10);
 d9 = d5 < d6 ? d5 : d6;
 print(d9);
 HEAPF64[tempDoublePtr >> 3] = d10;
 i8 = STACKTOP;
 HEAP32[i8 >> 2] = HEAP32[tempDoublePtr >> 2];
 HEAP32[i8 + 4 >> 2] = HEAP32[tempDoublePtr + 4 >> 2];
 print(HEAP32[i8 >> 2]);
 print(HEAP32[i8 + 4 >> 2]);
}
''', [], '1\n3\n0\n1072693248\n')

    do_js_test('bigswitch', r'''
function _main() {
 var i2 = 0, i3 = 0, i4 = 0, i6 = 0, i8 = 0, i9 = 0, i10 = 0, i11 = 0, i12 = 0, i13 = 0, i14 = 0, i15 = 0, i16 = 0, i5 = 0, i7 = 0, i1 = 0;
 print(4278);
 i6 = 0;
 L1 : while (1) {
  i11 = -1;
  switch ((i11 | 0)) {
  case 0:
   {
    i6 = 67;
    break;
   }
  default:
   {}
  }
  print(i6);
  break;
 }
 print(i6);
}
''', [], '4278\n0\n0\n')

    do_js_test('big int compare', r'''
function _main() {
  print ((0 > 4294963001) | 0);
}
''', [], '0\n')

    do_js_test('effectless expressions, with a subeffect', r'''
function _main() {
  (print (123) | 0) != 0;
  print (456) | 0;
  0 != (print (789) | 0);
  0 | (print (159) | 0);
}
''', [], '123\n456\n789\n159\n')

    do_js_test('effectless unary', r'''
function _main() {
  !(0 != 0);
  !(print (123) | 0);
}
''', [], '123\n')

    do_js_test('flexible mod', r'''
function _main() {
  print(1 % 16);
}
''', [], '1\n')

  @no_wasm_backend("uses emterpreter")
  def test_emterpreter_logging(self):
    # codegen log tests

    def do_log_test(source, expected, func):
      print('log test', source, expected)
      with env_modify({'EMCC_LOG_EMTERPRETER_CODE': '1'}):
        err = run_process([PYTHON, EMCC, source, '-O3', '-s', 'EMTERPRETIFY=1'], stderr=PIPE).stderr
      lines = err.split('\n')
      lines = [line for line in lines if 'raw bytecode for ' + func in line]
      assert len(lines) == 1, '\n\n'.join(lines)
      err = lines[0]
      parts = err.split('insts: ')
      pre, post = parts[:2]
      assert func in pre, pre
      post = post.split('\n')[0]
      seen = int(post)
      print('  seen', seen, ', expected ', expected, type(seen), type(expected))
      assert expected == seen or (type(expected) in [list, tuple] and seen in expected), ['expect', expected, 'but see', seen]

    do_log_test(path_from_root('tests', 'primes.cpp'), list(range(88, 101)), '_main')
    do_log_test(path_from_root('tests', 'fannkuch.cpp'), list(range(226, 241)), '__Z15fannkuch_workerPv')

  @no_wasm_backend('uses emterpreter')
  def test_emterpreter_advise(self):
    out = run_process([PYTHON, EMCC, path_from_root('tests', 'emterpreter_advise.cpp'), '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_ADVISE=1'], stdout=PIPE).stdout
    self.assertContained('-s EMTERPRETIFY_WHITELIST=\'["__Z6middlev", "__Z7sleeperv", "__Z8recurserv", "_main"]\'', out)

    out = run_process([PYTHON, EMCC, path_from_root('tests', 'emterpreter_advise_funcptr.cpp'), '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_ADVISE=1'], stdout=PIPE).stdout
    self.assertContained('-s EMTERPRETIFY_WHITELIST=\'["__Z4posti", "__Z5post2i", "__Z6middlev", "__Z7sleeperv", "__Z8recurserv", "_main"]\'', out)

    out = run_process([PYTHON, EMCC, path_from_root('tests', 'emterpreter_advise_synclist.c'), '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_ADVISE=1', '-s', 'EMTERPRETIFY_SYNCLIST=["_j","_k"]'], stdout=PIPE).stdout
    self.assertContained('-s EMTERPRETIFY_WHITELIST=\'["_a", "_b", "_e", "_f", "_main"]\'', out)

    # The same EMTERPRETIFY_WHITELIST should be in core.test_coroutine_emterpretify_async
    out = run_process([PYTHON, EMCC, path_from_root('tests', 'test_coroutines.cpp'), '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_ADVISE=1'], stdout=PIPE).stdout
    self.assertContained('-s EMTERPRETIFY_WHITELIST=\'["_f", "_fib", "_g"]\'', out)

  @no_wasm_backend('uses emterpreter')
  def test_emterpreter_async_assertions(self):
    # emterpretify-async mode with assertions adds checks on each call out of the emterpreter;
    # make sure we handle all possible types there
    for t, out in [
      ('int',    '18.00'),
      ('float',  '18.51'),
      ('double', '18.51'),
    ]:
      print(t, out)
      create_test_file('src.c', r'''
        #include <stdio.h>
        #include <emscripten.h>

        #define TYPE %s

        TYPE marfoosh(TYPE input) {
          return input * 1.5;
        }

        TYPE fleefl(TYPE input) {
          return marfoosh(input);
        }

        int main(void) {
          printf("result: %%.2f\n", (double)fleefl((TYPE)12.34));
        }
      ''' % t)
      run_process([PYTHON, EMCC, 'src.c', '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_WHITELIST=["_fleefl"]', '-s', 'PRECISE_F32=1'])
      self.assertContained('result: ' + out, run_js('a.out.js'))

  @no_wasm_backend('uses emterpreter')
  def test_emterpreter_async_whitelist_wildcard(self):
    # using wildcard to match homonymous functions that the linker
    # unpredictably renamed
    create_test_file('src1.c', r'''
      #include <stdio.h>
      extern void call_other_module();
      static void homonymous() {
          printf("result: 1\n");
      }
      int main() {
          homonymous();
          call_other_module();
      }
      ''')
    create_test_file('src2.c', r'''
      #include <emscripten.h>
      #include <stdio.h>
      static void homonymous() {
          emscripten_sleep(1);
          printf("result: 2\n");
      }
      void call_other_module() {
          homonymous();
      }
      ''')
    run_process([PYTHON, EMCC, 'src1.c', 'src2.c', '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_WHITELIST=["_main", "_call_other_module", "_homonymous*"]'])
    self.assertContained('result: 1\nresult: 2', run_js('a.out.js'))

  @no_wasm_backend('uses EMTERPRETIFY')
  def test_call_nonemterpreted_during_sleep(self):
    create_test_file('src.c', r'''
#include <stdio.h>
#include <emscripten.h>

EMSCRIPTEN_KEEPALIVE void emterpreted_yielder() {
  int counter = 0;
  while (1) {
    printf("emterpreted_yielder() sleeping...\n");
    emscripten_sleep_with_yield(10);
    counter++;
    if (counter == 3) {
      printf("Success\n");
      break;
    }
  }
}

EMSCRIPTEN_KEEPALIVE void not_emterpreted() {
  printf("Entering not_emterpreted()\n");
}

int main() {
  EM_ASM({
    setTimeout(function () {
      console.log("calling not_emterpreted()");
      Module["_not_emterpreted"]();
    }, 0);
    console.log("calling emterpreted_yielder()");
#ifdef BAD_EM_ASM
    Module['_emterpreted_yielder']();
#endif
  });
#ifndef BAD_EM_ASM
  emterpreted_yielder();
#endif
}
    ''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_BLACKLIST=["_not_emterpreted"]'])
    self.assertContained('Success', run_js('a.out.js'))

    print('check calling of emterpreted as well')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1'])
    self.assertContained('Success', run_js('a.out.js'))

    print('check for invalid EM_ASM usage')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'EMTERPRETIFY=1', '-s', 'EMTERPRETIFY_ASYNC=1', '-s', 'EMTERPRETIFY_BLACKLIST=["_not_emterpreted"]', '-DBAD_EM_ASM'])
    self.assertContained('cannot have an EM_ASM on the stack when emterpreter pauses/resumes', run_js('a.out.js', stderr=STDOUT, assert_returncode=None))

  def test_link_with_a_static(self):
    create_test_file('x.c', r'''
int init_weakref(int a, int b) {
  return a + b;
}
''')
    create_test_file('y.c', r'''
static int init_weakref(void) { // inlined in -O2, not in -O0 where it shows up in llvm-nm as 't'
  return 150;
}

int testy(void) {
  return init_weakref();
}
''')
    create_test_file('z.c', r'''
extern int init_weakref(int, int);
extern int testy(void);

int main(void) {
  return testy() + init_weakref(5, 6);
}
''')
    run_process([PYTHON, EMCC, 'x.c', '-o', 'x.o'])
    run_process([PYTHON, EMCC, 'y.c', '-o', 'y.o'])
    run_process([PYTHON, EMCC, 'z.c', '-o', 'z.o'])
    try_delete('libtest.a')
    run_process([PYTHON, EMAR, 'rc', 'libtest.a', 'y.o'])
    run_process([PYTHON, EMAR, 'rc', 'libtest.a', 'x.o'])
    run_process([PYTHON, EMRANLIB, 'libtest.a'])

    for args in [[], ['-O2']]:
      print('args:', args)
      run_process([PYTHON, EMCC, 'z.o', 'libtest.a', '-s', 'EXIT_RUNTIME=1'] + args)
      run_js('a.out.js', assert_returncode=161)

  def test_link_with_bad_o_in_a(self):
    # when building a .a, we force-include all the objects inside it. but, some
    # may not be valid bitcode, e.g. if it contains metadata or something else
    # weird. we should just ignore those
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'a.bc'])
    create_test_file('bad.bc', 'this is not a good file, it should be ignored!')
    run_process([LLVM_AR, 'r', 'a.a', 'a.bc', 'bad.bc'])
    run_process([PYTHON, EMCC, 'a.a'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_require(self):
    inname = path_from_root('tests', 'hello_world.c')
    Building.emcc(inname, args=['-s', 'ASSERTIONS=0'], output_filename='a.out.js')
    output = run_process(NODE_JS + ['-e', 'require("./a.out.js")'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\n' and output.stderr == '', 'expected no output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)

  def test_require_modularize(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'MODULARIZE=1', '-s', 'ASSERTIONS=0'])
    src = open('a.out.js').read()
    assert "module.exports = Module;" in src
    output = run_process(NODE_JS + ['-e', 'var m = require("./a.out.js"); m();'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\n' and output.stderr == '', 'expected output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'MODULARIZE=1', '-s', 'EXPORT_NAME="NotModule"', '-s', 'ASSERTIONS=0'])
    src = open('a.out.js').read()
    assert "module.exports = NotModule;" in src
    output = run_process(NODE_JS + ['-e', 'var m = require("./a.out.js"); m();'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\n' and output.stderr == '', 'expected output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'MODULARIZE=1'])
    # We call require() twice to ensure it returns wrapper function each time
    output = run_process(NODE_JS + ['-e', 'require("./a.out.js")();var m = require("./a.out.js"); m();'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\nhello, world!\n', 'expected output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)

  def test_define_modularize(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'MODULARIZE=1', '-s', 'ASSERTIONS=0'])
    with open('a.out.js') as f:
      src = 'var module = 0; ' + f.read()
    create_test_file('a.out.js', src)
    assert "define([], function() { return Module; });" in src
    output = run_process(NODE_JS + ['-e', 'var m; (global.define = function(deps, factory) { m = factory(); }).amd = true; require("./a.out.js"); m();'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\n' and output.stderr == '', 'expected output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'MODULARIZE=1', '-s', 'EXPORT_NAME="NotModule"', '-s', 'ASSERTIONS=0'])
    with open('a.out.js') as f:
      src = 'var module = 0; ' + f.read()
    create_test_file('a.out.js', src)
    assert "define([], function() { return NotModule; });" in src
    output = run_process(NODE_JS + ['-e', 'var m; (global.define = function(deps, factory) { m = factory(); }).amd = true; require("./a.out.js"); m();'], stdout=PIPE, stderr=PIPE)
    assert output.stdout == 'hello, world!\n' and output.stderr == '', 'expected output, got\n===\nSTDOUT\n%s\n===\nSTDERR\n%s\n===\n' % (output.stdout, output.stderr)

  def test_emconfigure_js_o(self):
    # issue 2994
    for i in [0, 1, 2]:
      with env_modify({'EMCONFIGURE_JS': str(i)}):
        for f in ['hello_world.c', 'files.cpp']:
          print(i, f)
          self.clear()
          run_process([PYTHON, path_from_root('emconfigure'), PYTHON, EMCC, '-c', '-o', 'a.o', path_from_root('tests', f)])
          run_process([PYTHON, EMCC, 'a.o'], check=False, stderr=PIPE)
          if f == 'hello_world.c':
            if i == 0:
              assert not os.path.exists('a.out.js') # native .o, not bitcode!
            else:
              assert 'hello, world!' in run_js('a.out.js')
          else:
            # file access, need 2 to force js
            if i == 0 or i == 1:
              assert not os.path.exists('a.out.js') # native .o, not bitcode!
            else:
              self.assertExists('a.out.js')

  @no_wasm_backend('tests fastcomp specific passes')
  def test_emcc_c_multi(self):
    def test(args, llvm_opts=None):
      print(args)
      lib = r'''
        int mult() { return 1; }
      '''

      lib_name = 'libA.c'
      create_test_file(lib_name, lib)
      main = r'''
        #include <stdio.h>
        int mult();
        int main() {
          printf("result: %d\n", mult());
          return 0;
        }
      '''
      main_name = 'main.c'
      create_test_file(main_name, main)

      err = run_process([PYTHON, EMCC, '-v', '-c', main_name, lib_name] + args, stderr=PIPE).stderr

      VECTORIZE = '-disable-loop-vectorization'

      if args:
        assert err.count(VECTORIZE) == 2, err # specified twice, once per file
        # corresponding to exactly once per invocation of optimizer
        assert err.count(os.path.sep + 'opt') == 2, err
      else:
        assert err.count(VECTORIZE) == 0, err # no optimizations

      run_process([PYTHON, EMCC, main_name.replace('.c', '.o'), lib_name.replace('.c', '.o')])

      self.assertContained('result: 1', run_js('a.out.js'))

    test([])
    test(['-O2'], '-O3')
    test(['-Oz'], '-Oz')
    test(['-Os'], '-Os')

  def test_export_all_3142(self):
    create_test_file('src.cpp', r'''
typedef unsigned int Bit32u;

struct S_Descriptor {
    Bit32u limit_0_15   :16;
    Bit32u base_0_15    :16;
    Bit32u base_16_23   :8;
};

class Descriptor
{
public:
    Descriptor() { saved.fill[0]=saved.fill[1]=0; }
    union {
        S_Descriptor seg;
        Bit32u fill[2];
    } saved;
};

Descriptor desc;
    ''')
    try_delete('a.out.js')
    run_process([PYTHON, EMCC, 'src.cpp', '-O2', '-s', 'EXPORT_ALL'])
    self.assertExists('a.out.js')

  @no_wasm_backend('tests PRECISE_F32=1')
  def test_f0(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'fasta.cpp'), '-O2', '-s', 'PRECISE_F32=1', '-profiling', '-s', 'WASM=0'])
    src = open('a.out.js').read()
    assert ' = f0;' in src or ' = f0,' in src

  @no_wasm_backend('depends on merging asmjs')
  def test_merge_pair(self):
    def test(filename, full):
      print('----', filename, full)
      run_process([PYTHON, EMCC, path_from_root('tests', filename), '-O1', '-profiling', '-o', 'left.js', '-s', 'WASM=0'])
      src = open('left.js').read()
      create_test_file('right.js', src.replace('function _main() {', 'function _main() { out("replaced"); '))

      self.assertContained('hello, world!', run_js('left.js'))
      self.assertContained('hello, world!', run_js('right.js'))
      self.assertNotContained('replaced', run_js('left.js'))
      self.assertContained('replaced', run_js('right.js'))

      n = src.count('function _')

      def has(i):
        run_process([PYTHON, path_from_root('tools', 'merge_pair.py'), 'left.js', 'right.js', str(i), 'out.js'])
        return 'replaced' in run_js('out.js')

      assert not has(0), 'same as left'
      assert has(n), 'same as right'
      assert has(n + 5), 'same as right, big number is still ok'

      if full:
        change = -1
        for i in range(n):
          if has(i):
            change = i
            break
        assert change > 0 and change <= n

    test('hello_world.cpp', True)
    test('hello_libcxx.cpp', False)

  def test_emmake_emconfigure(self):
    def check(what, args, fail=True, expect=''):
      args = [PYTHON, path_from_root(what)] + args
      print(what, args, fail, expect)
      output = run_process(args, stdout=PIPE, stderr=PIPE, check=False)
      assert ('is a helper for' in output.stderr) == fail
      assert ('Typical usage' in output.stderr) == fail
      self.assertContained(expect, output.stdout)
    check('emmake', [])
    check('emconfigure', [])
    check('emmake', ['--version'])
    check('emconfigure', ['--version'])
    check('emmake', ['make'], fail=False)
    check('emconfigure', ['configure'], fail=False)
    check('emconfigure', ['./configure'], fail=False)
    check('emconfigure', ['cmake'], fail=False)

    create_test_file('test.py', '''
import os
print(os.environ.get('CROSS_COMPILE'))
''')
    check('emconfigure', [PYTHON, 'test.py'], expect=path_from_root('em'), fail=False)
    check('emmake', [PYTHON, 'test.py'], expect=path_from_root('em'), fail=False)

    create_test_file('test.py', '''
import os
print(os.environ.get('NM'))
''')
    check('emconfigure', [PYTHON, 'test.py'], expect=shared.LLVM_NM, fail=False)

  @no_windows('This test is broken, https://github.com/emscripten-core/emscripten/issues/8872')
  def test_emmake_python(self):
    # simulates a configure/make script that looks for things like CC, AR, etc., and which we should
    # not confuse by setting those vars to something containing `python X` as the script checks for
    # the existence of an executable.
    result = run_process([PYTHON, path_from_root('emmake.py'), PYTHON, path_from_root('tests', 'emmake', 'make.py')], stdout=PIPE, stderr=PIPE)
    print(result.stdout, result.stderr)

  def test_sdl2_config(self):
    for args, expected in [
      [['--version'], '2.0.0'],
      [['--cflags'], '-s USE_SDL=2'],
      [['--libs'], '-s USE_SDL=2'],
      [['--cflags', '--libs'], '-s USE_SDL=2'],
    ]:
      print(args, expected)
      out = run_process([PYTHON, path_from_root('system', 'bin', 'sdl2-config')] + args, stdout=PIPE, stderr=PIPE).stdout
      assert expected in out, out
      print('via emmake')
      out = run_process([PYTHON, path_from_root('emmake'), 'sdl2-config'] + args, stdout=PIPE, stderr=PIPE).stdout
      assert expected in out, out

  def test_module_onexit(self):
    create_test_file('src.cpp', r'''
#include <emscripten.h>
int main() {
  EM_ASM({
    Module['onExit'] = function(status) { out('exiting now, status ' + status) };
  });
  return 14;
}
''')
    try_delete('a.out.js')
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'EXIT_RUNTIME=1'])
    self.assertContained('exiting now, status 14', run_js('a.out.js', assert_returncode=14))

  def test_NO_aliasing(self):
    # the NO_ prefix flips boolean options
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EXIT_RUNTIME=1'])
    exit_1 = open('a.out.js').read()
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'NO_EXIT_RUNTIME=0'])
    no_exit_0 = open('a.out.js').read()
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EXIT_RUNTIME=0'])
    exit_0 = open('a.out.js').read()

    assert exit_1 == no_exit_0
    assert exit_1 != exit_0

  def test_underscore_exit(self):
    create_test_file('src.cpp', r'''
#include <unistd.h>
int main() {
  _exit(0); // should not end up in an infinite loop with non-underscore exit
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('', run_js('a.out.js', assert_returncode=0))

  def test_file_packager_huge(self):
    MESSAGE = 'warning: file packager is creating an asset bundle of 257 MB. this is very large, and browsers might have trouble loading it'
    create_test_file('huge.dat', 'a' * (1024 * 1024 * 257))
    create_test_file('tiny.dat', 'a')
    err = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'tiny.dat'], stdout=PIPE, stderr=PIPE).stderr
    self.assertNotContained(MESSAGE, err)
    err = run_process([PYTHON, FILE_PACKAGER, 'test.data', '--preload', 'huge.dat'], stdout=PIPE, stderr=PIPE).stderr
    self.assertContained(MESSAGE, err)
    self.clear()

  def test_massive_alloc(self):
    create_test_file('main.cpp', r'''
#include <stdio.h>
#include <stdlib.h>

int main() {
  volatile int x = (int)malloc(1024 * 1024 * 1400);
  return x == 0; // can't alloc it, but don't fail catastrophically, expect null
}
    ''')
    run_process([PYTHON, EMCC, 'main.cpp', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM=0'])
    # just care about message regarding allocating over 1GB of memory
    output = run_js('a.out.js', stderr=PIPE, full_output=True)
    self.assertContained('''Warning: Enlarging memory arrays, this is not fast! 16777216,1543503872\n''', output)
    print('wasm')
    run_process([PYTHON, EMCC, 'main.cpp', '-s', 'ALLOW_MEMORY_GROWTH=1'])
    # no message about growth, just check return code
    run_js('a.out.js', stderr=PIPE, full_output=True)

  def test_failing_alloc(self):
    for pre_fail, post_fail, opts in [
      ('', '', []),
      ('EM_ASM( Module.temp = HEAP32[DYNAMICTOP_PTR>>2] );', 'EM_ASM( assert(Module.temp === HEAP32[DYNAMICTOP_PTR>>2], "must not adjust DYNAMICTOP when an alloc fails!") );', []),
      # also test non-wasm in normal mode
      ('', '', ['-s', 'WASM=0']),
      ('EM_ASM( Module.temp = HEAP32[DYNAMICTOP_PTR>>2] );', 'EM_ASM( assert(Module.temp === HEAP32[DYNAMICTOP_PTR>>2], "must not adjust DYNAMICTOP when an alloc fails!") );', ['-s', 'WASM=0']),
    ]:
      for growth in [0, 1]:
        for aborting in [0, 1]:
          create_test_file('main.cpp', r'''
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <assert.h>
#include <emscripten.h>

#define CHUNK_SIZE (10 * 1024 * 1024)

int main() {
  std::vector<void*> allocs;
  bool has = false;
  while (1) {
    printf("trying an allocation\n");
    %s
    void* curr = malloc(CHUNK_SIZE);
    if (!curr) {
      %s
      break;
    }
    has = true;
    printf("allocated another chunk, %%zu so far\n", allocs.size());
    allocs.push_back(curr);
  }
  assert(has);
  printf("an allocation failed!\n");
#ifdef SPLIT
  return 0;
#endif
  while (1) {
    assert(allocs.size() > 0);
    void *curr = allocs.back();
    allocs.pop_back();
    free(curr);
    printf("freed one\n");
    if (malloc(CHUNK_SIZE)) break;
  }
  printf("managed another malloc!\n");
}
''' % (pre_fail, post_fail))
          args = [PYTHON, EMCC, 'main.cpp'] + opts
          args += ['-s', 'TEST_MEMORY_GROWTH_FAILS=1'] # In this test, force memory growing to fail
          if growth:
            args += ['-s', 'ALLOW_MEMORY_GROWTH=1']
          if not aborting:
            args += ['-s', 'ABORTING_MALLOC=0']
          print('test_failing_alloc', args, pre_fail)
          run_process(args)
          # growth also disables aborting
          can_manage_another = (not aborting) or growth
          split = '-DSPLIT' in args
          print('can manage another:', can_manage_another, 'split:', split)
          output = run_js('a.out.js', stderr=PIPE, full_output=True, assert_returncode=0 if can_manage_another else None)
          if can_manage_another:
            self.assertContained('''an allocation failed!\n''', output)
            if not split:
              # split memory allocation may fail due to GC objects no longer being allocatable,
              # and we can't expect to recover from that deterministically. So just check we
              # get to the fail.
              # otherwise, we should fail eventually, then free, then succeed
              self.assertContained('''managed another malloc!\n''', output)
          else:
            # we should see an abort
            self.assertContained('''abort(Cannot enlarge memory arrays''', output)
            self.assertContained(('''higher than the current value 16777216,''', '''higher than the current value 33554432,'''), output)
            self.assertContained('''compile with  -s ALLOW_MEMORY_GROWTH=1 ''', output)
            self.assertContained('''compile with  -s ABORTING_MALLOC=0 ''', output)

  def test_libcxx_minimal(self):
    create_test_file('vector.cpp', r'''
#include <vector>
int main(int argc, char** argv) {
  std::vector<void*> v;
  for (int i = 0 ; i < argc; i++) {
    v.push_back(nullptr);
  }
  return v.size();
}
''')

    run_process([PYTHON, EMCC, '-O2', 'vector.cpp', '-o', 'vector.js'])
    run_process([PYTHON, EMCC, '-O2', path_from_root('tests', 'hello_libcxx.cpp'), '-o', 'iostream.js'])

    vector = os.path.getsize('vector.js')
    iostream = os.path.getsize('iostream.js')
    print(vector, iostream)

    self.assertGreater(vector, 1000)
    # we can strip out almost all of libcxx when just using vector
    self.assertLess(2.25 * vector, iostream)

  @no_wasm_backend('relies on EMULATED_FUNCTION_POINTERS')
  def test_emulated_function_pointers(self):
    create_test_file('src.c', r'''
      #include <emscripten.h>
      typedef void (*fp)();
      int main(int argc, char **argv) {
        volatile fp f = 0;
        EM_ASM({
          if (typeof FUNCTION_TABLE_v !== 'undefined') {
            out('function table: ' + FUNCTION_TABLE_v);
          } else {
            out('no visible function tables');
          }
        });
        if (f) f();
        return 0;
      }
      ''')

    def test(args, expected):
      print(args, expected)
      run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM=0'] + args, stderr=PIPE)
      self.assertContained(expected, run_js('a.out.js'))

    for opts in [0, 1, 2, 3]:
      test(['-O' + str(opts)], 'no visible function tables')
      test(['-O' + str(opts), '-s', 'EMULATED_FUNCTION_POINTERS=1'], 'function table: ')

  @no_wasm_backend('relies on EMULATED_FUNCTION_POINTERS')
  def test_emulated_function_pointers_2(self):
    create_test_file('src.c', r'''
      #include <emscripten.h>
      typedef void (*fp)();
      static void one() { EM_ASM( out('one') ); }
      static void two() { EM_ASM( out('two') ); }
      void test() {
        volatile fp f = one;
        f();
        f = two;
        f();
      }
      int main(int argc, char **argv) {
        test();
        // swap them!
        EM_ASM_INT({
          var one = $0;
          var two = $1;
          if (typeof FUNCTION_TABLE_v === 'undefined') {
            out('no');
            return;
          }
          var temp = FUNCTION_TABLE_v[one];
          FUNCTION_TABLE_v[one] = FUNCTION_TABLE_v[two];
          FUNCTION_TABLE_v[two] = temp;
        }, (int)&one, (int)&two);
        test();
        return 0;
      }
      ''')

    flipped = 'one\ntwo\ntwo\none\n'
    unchanged = 'one\ntwo\none\ntwo\n'
    no_table = 'one\ntwo\nno\none\ntwo\n'

    def test(args, expected):
      print(args, expected.replace('\n', ' '))
      run_process([PYTHON, EMCC, 'src.c', '-s', 'WASM=0'] + args)
      self.assertContained(expected, run_js('a.out.js'))

    for opts in [0, 1, 2]:
      test(['-O' + str(opts)], no_table)
      test(['-O' + str(opts), '-s', 'EMULATED_FUNCTION_POINTERS=1'], flipped)
      test(['-O' + str(opts), '-s', 'EMULATED_FUNCTION_POINTERS=2'], flipped)
      test(['-O' + str(opts), '-s', 'EMULATED_FUNCTION_POINTERS=1', '-s', 'RELOCATABLE=1'], flipped)
      test(['-O' + str(opts), '-s', 'EMULATED_FUNCTION_POINTERS=2', '-s', 'RELOCATABLE=1'], unchanged) # with both of those, we optimize and you cannot flip them
      test(['-O' + str(opts), '-s', 'MAIN_MODULE=1'], unchanged) # default for modules is optimized
      test(['-O' + str(opts), '-s', 'MAIN_MODULE=1', '-s', 'EMULATED_FUNCTION_POINTERS=2'], unchanged)
      test(['-O' + str(opts), '-s', 'MAIN_MODULE=1', '-s', 'EMULATED_FUNCTION_POINTERS=1'], flipped) # but you can disable that

  def test_minimal_dynamic(self):
    def run(wasm):
      print('wasm?', wasm)
      library_file = 'library.wasm' if wasm else 'library.js'

      def test(main_args, library_args=[], expected='hello from main\nhello from library'):
        print('testing', main_args, library_args)
        self.clear()
        create_test_file('library.c', r'''
          #include <stdio.h>
          void library_func() {
          #ifdef USE_PRINTF
            printf("hello from library: %p\n", &library_func);
          #else
            puts("hello from library");
          #endif
          }
        ''')
        # -fno-builtin to prevent printf -> iprintf optimization
        run_process([PYTHON, EMCC, 'library.c', '-fno-builtin', '-s', 'SIDE_MODULE=1', '-O2', '-o', library_file, '-s', 'WASM=' + str(wasm), '-s', 'EXPORT_ALL'] + library_args)
        create_test_file('main.c', r'''
          #include <dlfcn.h>
          #include <stdio.h>
          int main() {
            puts("hello from main");
            void *lib_handle = dlopen("%s", 0);
            if (!lib_handle) {
              puts("cannot load side module");
              return 1;
            }
            typedef void (*voidfunc)();
            voidfunc x = (voidfunc)dlsym(lib_handle, "library_func");
            if (!x) puts("cannot find side function");
            else x();
          }
        ''' % library_file)
        run_process([PYTHON, EMCC, 'main.c', '--embed-file', library_file, '-O2', '-s', 'WASM=' + str(wasm)] + main_args)
        self.assertContained(expected, run_js('a.out.js', assert_returncode=None, stderr=STDOUT))
        size = os.path.getsize('a.out.js')
        if wasm:
          size += os.path.getsize('a.out.wasm')
        side_size = os.path.getsize(library_file)
        print('  sizes:', size, side_size)
        return (size, side_size)

      def percent_diff(x, y):
        small = min(x, y)
        large = max(x, y)
        return float(100 * large) / small - 100

      full = test(main_args=['-s', 'MAIN_MODULE=1'])
      # printf is not used in main, but libc was linked in, so it's there
      printf = test(main_args=['-s', 'MAIN_MODULE=1'], library_args=['-DUSE_PRINTF'])

      # main module tests

      # dce in main, and it fails since puts is not exported
      dce = test(main_args=['-s', 'MAIN_MODULE=2'], expected=('cannot', 'undefined'))

      # with exporting, it works
      dce = test(main_args=['-s', 'MAIN_MODULE=2', '-s', 'EXPORTED_FUNCTIONS=["_main", "_puts"]'])

      # printf is not used in main, and we dce, so we failz
      dce_fail = test(main_args=['-s', 'MAIN_MODULE=2'], library_args=['-DUSE_PRINTF'], expected=('cannot', 'undefined'))

      # exporting printf in main keeps it alive for the library
      dce_save = test(main_args=['-s', 'MAIN_MODULE=2', '-s', 'EXPORTED_FUNCTIONS=["_main", "_printf", "_puts"]'], library_args=['-DUSE_PRINTF'])

      self.assertLess(percent_diff(full[0], printf[0]), 4)
      self.assertLess(percent_diff(dce[0], dce_fail[0]), 4)
      self.assertLess(dce[0], 0.2 * full[0]) # big effect, 80%+ is gone
      self.assertGreater(dce_save[0], 1.05 * dce[0]) # save exported all of printf

      # side module tests

      # mode 2, so dce in side, but library_func is not exported, so it is dce'd
      side_dce_fail = test(main_args=['-s', 'MAIN_MODULE=1'], library_args=['-s', 'SIDE_MODULE=2'], expected='cannot find side function')
      # mode 2, so dce in side, and library_func is not exported
      side_dce_work = test(main_args=['-s', 'MAIN_MODULE=1'], library_args=['-s', 'SIDE_MODULE=2', '-s', 'EXPORTED_FUNCTIONS=["_library_func"]'], expected='hello from library')

      self.assertLess(side_dce_fail[1], 0.95 * side_dce_work[1]) # removing that function saves a chunk

    run(wasm=1)
    if not self.is_wasm_backend():
      run(wasm=0)

  def test_ld_library_path(self):
    create_test_file('hello1.c', r'''
#include <stdio.h>

void
hello1 ()
{
  printf ("Hello1\n");
  return;
}

''')
    create_test_file('hello2.c', r'''
#include <stdio.h>

void
hello2 ()
{
  printf ("Hello2\n");
  return;
}

''')
    create_test_file('hello3.c', r'''
#include <stdio.h>

void
hello3 ()
{
  printf ("Hello3\n");
  return;
}

''')
    create_test_file('hello4.c', r'''
#include <stdio.h>
#include <math.h>

double
hello4 (double x)
{
  printf ("Hello4\n");
  return fmod(x, 2.0);
}

''')
    create_test_file('pre.js', r'''
Module['preRun'].push(function (){
  ENV['LD_LIBRARY_PATH']='/lib:/usr/lib';
});
''')
    create_test_file('main.c', r'''
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>

int
main()
{
  void *h;
  void (*f) ();
  double (*f2) (double);

  h = dlopen ("libhello1.wasm", RTLD_NOW);
  f = dlsym (h, "hello1");
  f();
  dlclose (h);
  h = dlopen ("libhello2.wasm", RTLD_NOW);
  f = dlsym (h, "hello2");
  f();
  dlclose (h);
  h = dlopen ("libhello3.wasm", RTLD_NOW);
  f = dlsym (h, "hello3");
  f();
  dlclose (h);
  h = dlopen ("/usr/local/lib/libhello4.wasm", RTLD_NOW);
  f2 = dlsym (h, "hello4");
  double result = f2(5.5);
  dlclose (h);

  if (result == 1.5) {
    printf("Ok\n");
  }
  return 0;
}

''')

    run_process([PYTHON, EMCC, '-o', 'libhello1.wasm', 'hello1.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'libhello2.wasm', 'hello2.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'libhello3.wasm', 'hello3.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'libhello4.wasm', 'hello4.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'main.js', 'main.c', '-s', 'MAIN_MODULE=1', '-s', 'TOTAL_MEMORY=' + str(32 * 1024 * 1024),
                 '--embed-file', 'libhello1.wasm@/lib/libhello1.wasm',
                 '--embed-file', 'libhello2.wasm@/usr/lib/libhello2.wasm',
                 '--embed-file', 'libhello3.wasm@/libhello3.wasm',
                 '--embed-file', 'libhello4.wasm@/usr/local/lib/libhello4.wasm',
                 '--pre-js', 'pre.js'])
    out = run_js('main.js')
    self.assertContained('Hello1', out)
    self.assertContained('Hello2', out)
    self.assertContained('Hello3', out)
    self.assertContained('Hello4', out)
    self.assertContained('Ok', out)

  def test_dlopen_rtld_global(self):
    # TODO: wasm support. this test checks RTLD_GLOBAL where a module is loaded
    #       before the module providing a global it needs is. in asm.js we use JS
    #       to create a redirection function. In wasm we just have wasm, so we
    #       need to introspect the wasm module. Browsers may add that eventually,
    #       or we could ship a little library that does it.
    create_test_file('hello1.c', r'''
#include <stdio.h>

extern int hello1_val;
int hello1_val=3;

void
hello1 (int i)
{
  printf ("hello1_val by hello1:%d\n",hello1_val);
  printf ("Hello%d\n",i);
}
''')
    create_test_file('hello2.c', r'''
#include <stdio.h>

extern int hello1_val;
extern void hello1 (int);

void
hello2 (int i)
{
  void (*f) (int);
  printf ("hello1_val by hello2:%d\n",hello1_val);
  f = hello1;
  f(i);
}
''')
    create_test_file('main.c', r'''
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>

int
main(int argc,char** argv)
{
  void *h;
  void *h2;
  void (*f) (int);
  h = dlopen ("libhello1.wasm", RTLD_NOW|RTLD_GLOBAL);
  h2 = dlopen ("libhello2.wasm", RTLD_NOW|RTLD_GLOBAL);
  f = dlsym (h, "hello1");
  f(1);
  f = dlsym (h2, "hello2");
  f(2);
  dlclose (h);
  dlclose (h2);
  return 0;
}
''')

    run_process([PYTHON, EMCC, '-o', 'libhello1.js', 'hello1.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'libhello2.js', 'hello2.c', '-s', 'SIDE_MODULE=1', '-s', 'EXPORT_ALL=1'])
    run_process([PYTHON, EMCC, '-o', 'main.js', 'main.c', '-s', 'MAIN_MODULE=1',
                 '--embed-file', 'libhello1.wasm',
                 '--embed-file', 'libhello2.wasm'])
    out = run_js('main.js')
    self.assertContained('Hello1', out)
    self.assertContained('Hello2', out)
    self.assertContained('hello1_val by hello1:3', out)
    self.assertContained('hello1_val by hello2:3', out)

  def test_debug_asmLastOpts(self):
    create_test_file('src.c', r'''
#include <stdio.h>
struct Dtlink_t
{   struct Dtlink_t*   right;  /* right child      */
        union
        { unsigned int  _hash;  /* hash value       */
          struct Dtlink_t* _left;  /* left child       */
        } hl;
};
int treecount(register struct Dtlink_t* e)
{
  return e ? treecount(e->hl._left) + treecount(e->right) + 1 : 0;
}
int main() {
  printf("hello, world!\n");
}
''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'EXPORTED_FUNCTIONS=["_main", "_treecount"]', '--minify', '0', '-g4', '-Oz'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  @no_wasm_backend('MEM_INIT_METHOD not supported under wasm')
  def test_meminit_crc(self):
    create_test_file('src.c', r'''
#include <stdio.h>
int main() { printf("Mary had a little lamb.\n"); }
''')

    run_process([PYTHON, EMCC, 'src.c', '--memory-init-file', '0', '-s', 'MEM_INIT_METHOD=2', '-s', 'ASSERTIONS=1', '-s', 'WASM=0'])
    with open('a.out.js') as f:
      d = f.read()
    return
    self.assertContained('Mary had', d)
    d = d.replace('Mary had', 'Paul had')
    create_test_file('a.out.js', d)
    out = run_js('a.out.js', assert_returncode=None, stderr=STDOUT)
    self.assertContained('Assertion failed: memory initializer checksum', out)

  def test_emscripten_print_double(self):
    create_test_file('src.c', r'''
#include <stdio.h>
#include <assert.h>
#include <emscripten.h>

void test(double d) {
  char buffer[100], buffer2[100];
  unsigned len, len2, len3;
  len = emscripten_print_double(d, NULL, -1);
  len2 = emscripten_print_double(d, buffer, len+1);
  assert(len == len2);
  buffer[len] = 0;
  len3 = snprintf(buffer2, 100, "%g", d);
  printf("|%g : %u : %s : %s : %d|\n", d, len, buffer, buffer2, len3);
}
int main() {
  printf("\n");
  test(0);
  test(1);
  test(-1);
  test(1.234);
  test(-1.234);
  test(1.1234E20);
  test(-1.1234E20);
  test(1.1234E-20);
  test(-1.1234E-20);
  test(1.0/0.0);
  test(-1.0/0.0);
}
''')
    run_process([PYTHON, EMCC, 'src.c'])
    out = run_js('a.out.js')
    self.assertContained('''
|0 : 1 : 0 : 0 : 1|
|1 : 1 : 1 : 1 : 1|
|-1 : 2 : -1 : -1 : 2|
|1.234 : 5 : 1.234 : 1.234 : 5|
|-1.234 : 6 : -1.234 : -1.234 : 6|
|1.1234e+20 : 21 : 112340000000000000000 : 1.1234e+20 : 10|
|-1.1234e+20 : 22 : -112340000000000000000 : -1.1234e+20 : 11|
|1.1234e-20 : 10 : 1.1234e-20 : 1.1234e-20 : 10|
|-1.1234e-20 : 11 : -1.1234e-20 : -1.1234e-20 : 11|
|inf : 8 : Infinity : inf : 3|
|-inf : 9 : -Infinity : -inf : 4|
''', out)

  def test_emscripten_scan_stack(self):
    create_test_file('src.cpp', r'''
#include <set>
#include <emscripten.h>
#include <stdio.h>

std::set<int> seenInts;

void scan(void* x, void* y) {
  printf("scan\n");
  int* p = (int*)x;
  int* q = (int*)y;
  // The callback sends us the [low, high) range.
  assert(p < q);
  // The range is of a reasonable size - not all of memory.
  assert(q - p < 100);
  while (p < q) {
    seenInts.insert(*p);
    p++;
  }
}

int main() {
  int x;
  int* y = &x;
  *y = 12345678;
  emscripten_scan_stack(scan);
  assert(seenInts.count(12345678));
  puts("ok");
}
''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('ok', run_js('a.out.js'))

  def test_no_warn_exported_jslibfunc(self):
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["alGetError"]', '-s', 'EXPORTED_FUNCTIONS=["_main", "_alGetError"]'], stdout=PIPE, stderr=PIPE).stderr
    self.assertNotContained('''function requested to be exported, but not implemented: "_alGetError"''', err)

  @no_wasm_backend()
  def test_almost_asm_warning(self):
    warning = "[-Walmost-asm]"
    for args, expected in [
      (['-O1', '-s', 'ALLOW_MEMORY_GROWTH=1'], True),  # default
      # suppress almost-asm warning manually
      (['-O1', '-s', 'ALLOW_MEMORY_GROWTH=1', '-Wno-almost-asm'], False),
      # last warning flag should "win"
      (['-O1', '-s', 'ALLOW_MEMORY_GROWTH=1', '-Wno-almost-asm', '-Walmost-asm'], True)
    ]:
      print(args, expected)
      err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0'] + args, stderr=PIPE).stderr
      assert (warning in err) == expected, err
      if not expected:
        assert err == '', err

  def test_musl_syscalls(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])
    src = open('a.out.js').read()
    matches = re.findall(r'''function ___syscall(\d+)\(''', src)
    # there should be no musl syscalls in hello world output
    self.assertEqual(matches, [])

  @no_windows('posix-only')
  def test_emcc_dev_null(self):
    out = run_process([PYTHON, EMCC, '-dM', '-E', '-x', 'c', '/dev/null'], stdout=PIPE).stdout
    self.assertContained('#define __EMSCRIPTEN__ 1', out) # all our defines should show up

  def test_umask_0(self):
    create_test_file('src.c', r'''
#include <sys/stat.h>
#include <stdio.h>
int main() {
  umask(0);
  printf("hello, world!\n");
}''')
    run_process([PYTHON, EMCC, 'src.c'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_no_missing_symbols(self): # simple hello world should not show any missing symbols
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])

    # main() is implemented in C, and even if requested from JS, we should not warn
    create_test_file('library_foo.js', '''
mergeInto(LibraryManager.library, {
  my_js__deps: ['main'],
  my_js: (function() {
      return function() {
        console.log("hello " + _nonexistingvariable);
      };
  }()),
});
''')
    create_test_file('test.cpp', '''
#include <stdio.h>
#include <stdlib.h>

extern "C" {
  extern void my_js();
}

int main() {
  my_js();
  return EXIT_SUCCESS;
}
''')
    run_process([PYTHON, EMCC, 'test.cpp', '--js-library', 'library_foo.js'])

    # but we do error on a missing js var
    create_test_file('library_foo_missing.js', '''
mergeInto(LibraryManager.library, {
  my_js__deps: ['main', 'nonexistingvariable'],
  my_js: (function() {
      return function() {
        console.log("hello " + _nonexistingvariable);
      };
  }()),
});
''')
    err = self.expect_fail([PYTHON, EMCC, 'test.cpp', '--js-library', 'library_foo_missing.js'])
    self.assertContained('undefined symbol: nonexistingvariable', err)

    # and also for missing C code, of course (without the --js-library, it's just a missing C method)
    err = self.expect_fail([PYTHON, EMCC, 'test.cpp'])
    self.assertContained('undefined symbol: my_js', err)

  def test_realpath(self):
    create_test_file('src.c', r'''
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

#define TEST_PATH "/boot/README.txt"

int
main(int argc, char **argv)
{
  errno = 0;
  char *t_realpath_buf = realpath(TEST_PATH, NULL);
  if (NULL == t_realpath_buf) {
    perror("Resolve failed");
    return 1;
  } else {
    printf("Resolved: %s\n", t_realpath_buf);
    free(t_realpath_buf);
    return 0;
  }
}
''')
    if not os.path.exists('boot'):
      os.mkdir('boot')
    open(os.path.join('boot', 'README.txt'), 'w').write(' ')
    run_process([PYTHON, EMCC, 'src.c', '--embed-file', 'boot'])
    self.assertContained('Resolved: /boot/README.txt', run_js('a.out.js'))

  def test_realpath_nodefs(self):
    create_test_file('src.c', r'''
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <emscripten.h>

#define TEST_PATH "/working/TEST_NODEFS.txt"

int
main(int argc, char **argv)
{
  errno = 0;
  EM_ASM({
    FS.mkdir('/working');
    FS.mount(NODEFS, { root: '.' }, '/working');
  });
  char *t_realpath_buf = realpath(TEST_PATH, NULL);
  if (NULL == t_realpath_buf) {
    perror("Resolve failed");
    return 1;
  } else {
    printf("Resolved: %s\n", t_realpath_buf);
    free(t_realpath_buf);
    return 0;
  }
}
''')
    create_test_file('TEST_NODEFS.txt', ' ')
    run_process([PYTHON, EMCC, 'src.c'])
    self.assertContained('Resolved: /working/TEST_NODEFS.txt', run_js('a.out.js'))

  def test_realpath_2(self):
    os.mkdir('Folder')
    create_test_file('src.c', r'''
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

int testrealpath(const char* path)    {
  errno = 0;
  char *t_realpath_buf = realpath(path, NULL);
  if (NULL == t_realpath_buf) {
    printf("Resolve failed: \"%s\"\n",path);fflush(stdout);
    return 1;
  } else {
    printf("Resolved: \"%s\" => \"%s\"\n", path, t_realpath_buf);fflush(stdout);
    free(t_realpath_buf);
    return 0;
  }
}

int main(int argc, char **argv)
{
    // files:
    testrealpath("testfile.txt");
    testrealpath("Folder/testfile.txt");
    testrealpath("testnonexistentfile.txt");
    // folders
    testrealpath("Folder");
    testrealpath("/Folder");
    testrealpath("./");
    testrealpath("");
    testrealpath("/");
    return 0;
}
''')
    create_test_file('testfile.txt', '')
    open(os.path.join('Folder', 'testfile.txt'), 'w').write('')
    run_process([PYTHON, EMCC, 'src.c', '--embed-file', 'testfile.txt', '--embed-file', 'Folder'])
    self.assertContained('''Resolved: "testfile.txt" => "/testfile.txt"
Resolved: "Folder/testfile.txt" => "/Folder/testfile.txt"
Resolve failed: "testnonexistentfile.txt"
Resolved: "Folder" => "/Folder"
Resolved: "/Folder" => "/Folder"
Resolved: "./" => "/"
Resolve failed: ""
Resolved: "/" => "/"
''', run_js('a.out.js'))

  def test_no_warnings(self):
    # build once before to make sure system libs etc. exist
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp')])
    # check that there is nothing in stderr for a regular compile
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp')], stderr=PIPE).stderr
    assert err == '', err

  @no_wasm_backend("uses EMTERPRETIFY")
  def test_emterpreter_file_suggestion(self):
    for linkable in [0, 1]:
      for to_file in [0, 1]:
        self.clear()
        cmd = [PYTHON, EMCC, '-s', 'EMTERPRETIFY=1', path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'LINKABLE=' + str(linkable), '-O1', '-s', 'USE_ZLIB=1']
        if to_file:
          cmd += ['-s', 'EMTERPRETIFY_FILE="code.dat"']
        print(cmd)
        stderr = run_process(cmd, stderr=PIPE).stderr
        need_warning = linkable and not to_file
        assert ('''warning: emterpreter bytecode is fairly large''' in stderr) == need_warning, stderr
        assert ('''It is recommended to use  -s EMTERPRETIFY_FILE=..''' in stderr) == need_warning, stderr

  def test_llvm_lto(self):
    sizes = {}
    # wasm backend doesn't have the fancy lto modes 2 and 3
    lto_levels = [0, 1, 2, 3] if not self.is_wasm_backend() else [0, 1]
    for lto in lto_levels:
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-O2', '--llvm-lto', str(lto)]
      if self.is_wasm_backend():
        cmd += ['-s', 'WASM_OBJECT_FILES=0']
      print(cmd)
      run_process(cmd)
      self.assertContained('hello, world!', run_js('a.out.js'))
      sizes[lto] = os.path.getsize('a.out.wasm')
    print(sizes)

    # LTO sizes should be distinct
    for i in lto_levels:
      assert sizes[i] not in set(sizes).difference(set([sizes[i]]))

    # LTO should reduce code size
    # Skip mode 2 because it has historically increased code size, but not always
    assert sizes[1] < sizes[0]
    if not self.is_wasm_backend():
      assert sizes[3] < sizes[0]

  def test_dlmalloc_modes(self):
    create_test_file('src.cpp', r'''
      #include <stdlib.h>
      #include <stdio.h>
      int main() {
        void* c = malloc(1024);
        free(c);
        free(c);
        printf("double-freed\n");
      }
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained('double-freed', run_js('a.out.js'))
    # in debug mode, the double-free is caught
    run_process([PYTHON, EMCC, 'src.cpp', '-g'])
    seen_error = False
    out = '?'
    try:
      out = run_js('a.out.js')
    except Exception:
      seen_error = True
    assert seen_error, out

  def test_mallocs(self):
    for opts in [[], ['-O2']]:
      print(opts)
      sizes = {}
      for malloc, name in (
        ('dlmalloc', 'dlmalloc'),
        (None, 'default'),
        ('emmalloc', 'emmalloc')
      ):
        print(malloc, name)
        cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-o', 'a.out.js'] + opts
        if malloc:
          cmd += ['-s', 'MALLOC="%s"' % malloc]
        print(cmd)
        run_process(cmd)
        sizes[name] = os.path.getsize('a.out.wasm')
      print(sizes)
      # dlmalloc is the default
      self.assertEqual(sizes['dlmalloc'], sizes['default'])
      # emmalloc is much smaller
      self.assertLess(sizes['emmalloc'], sizes['dlmalloc'] - 5000)

  def test_sixtyfour_bit_return_value(self):
    # This test checks that the most significant 32 bits of a 64 bit long are correctly made available
    # to native JavaScript applications that wish to interact with compiled code returning 64 bit longs.
    # The MS 32 bits should be available in Runtime.getTempRet0() even when compiled with -O2 --closure 1

    # Compile test.c and wrap it in a native JavaScript binding so we can call our compiled function from JS.
    run_process([PYTHON, EMCC, path_from_root('tests', 'return64bit', 'test.c'),
                 '--pre-js', path_from_root('tests', 'return64bit', 'testbindstart.js'),
                 '--pre-js', path_from_root('tests', 'return64bit', 'testbind.js'),
                 '--post-js', path_from_root('tests', 'return64bit', 'testbindend.js'),
                 '-s', 'EXPORTED_FUNCTIONS=["_test_return64"]', '-o', 'test.js', '-O2',
                 '--closure', '1', '-g1', '-s', 'WASM_ASYNC_COMPILATION=0'])

    # Simple test program to load the test.js binding library and call the binding to the
    # C function returning the 64 bit long.
    create_test_file('testrun.js', '''
      var test = require("./test.js");
      test.runtest();
    ''')

    # Run the test and confirm the output is as expected.
    out = run_js('testrun.js', full_output=True)
    assert "low = 5678" in out
    assert "high = 1234" in out

  def test_lib_include_flags(self):
    run_process([PYTHON, EMCC] + '-l m -l c -I'.split() + [path_from_root('tests', 'include_test'), path_from_root('tests', 'lib_include_flags.c')])

  def test_dash_s(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', '-std=c++03'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  def test_dash_s_response_file_string(self):
    create_test_file('response_file', '"MyModule"\n')
    response_file = os.path.join(os.getcwd(), "response_file")
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'EXPORT_NAME=@%s' % response_file])

  def test_dash_s_response_file_list(self):
    create_test_file('response_file', '["_main", "_malloc"]\n')
    response_file = os.path.join(os.getcwd(), "response_file")
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'EXPORTED_FUNCTIONS=@%s' % response_file, '-std=c++03'])

  def test_dash_s_unclosed_quote(self):
    # Unclosed quote
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), "-s", "TEST_KEY='MISSING_QUOTE"], stderr=PIPE, check=False).stderr
    self.assertNotContained('AssertionError', err) # Do not mention that it is an assertion error
    self.assertContained('unclosed opened quoted string. expected final character to be "\'"', err)

  def test_dash_s_single_quote(self):
    # Only one quote
    err = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), "-s", "TEST_KEY='"], stderr=PIPE, check=False).stderr
    self.assertNotContained('AssertionError', err) # Do not mention that it is an assertion error
    self.assertContained('unclosed opened quoted string.', err)

  def test_dash_s_unclosed_list(self):
    # Unclosed list
    err = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), "-s", "TEST_KEY=[Value1, Value2"])
    self.assertNotContained('AssertionError', err) # Do not mention that it is an assertion error
    self.assertContained('unclosed opened string list. expected final character to be "]"', err)

  def test_dash_s_valid_list(self):
    err = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), "-s", "TEST_KEY=[Value1, \"Value2\"]"])
    self.assertNotContained('a problem occured in evaluating the content after a "-s", specifically', err)

  def test_python_2_3(self):
    # check emcc/em++ can be called by any python
    def trim_py_suffix(filename):
      '''remove .py from EMCC(=emcc.py)'''
      return filename[:-3] if filename.endswith('.py') else filename

    for python in ('python', 'python2', 'python3'):
      if python == 'python3':
        has = is_python3_version_supported()
      else:
        has = Building.which(python) is not None
      print(python, has)
      if has:
        print('  checking emcc...')
        run_process([python, trim_py_suffix(EMCC), '--version'], stdout=PIPE)
        print('  checking em++...')
        run_process([python, trim_py_suffix(EMXX), '--version'], stdout=PIPE)
        print('  checking emcc.py...')
        run_process([python, EMCC, '--version'], stdout=PIPE)
        print('  checking em++.py...')
        run_process([python, EMXX, '--version'], stdout=PIPE)

  def test_zeroinit(self):
    create_test_file('src.c', r'''
#include <stdio.h>
int buf[1048576];
int main() {
  printf("hello, world! %d\n", buf[123456]);
  return 0;
}
''')
    run_process([PYTHON, EMCC, 'src.c', '-O2', '-g'])
    size = os.path.getsize('a.out.wasm')
    # size should be much smaller than the size of that zero-initialized buffer
    self.assertLess(size, 123456 / 2)

  @no_wasm_backend('asm.js')
  def test_separate_asm_warning(self):
    # Test that -s PRECISE_F32=2 raises a warning that --separate-asm is implied.
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '-s', 'PRECISE_F32=2', '-o', 'a.html'], stderr=PIPE).stderr
    self.assertContained('forcing separate asm output', stderr)

    # Test that -s PRECISE_F32=2 --separate-asm should not post a warning.
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '-s', 'PRECISE_F32=2', '-o', 'a.html', '--separate-asm'], stderr=PIPE).stderr
    self.assertNotContained('forcing separate asm output', stderr)

    # Test that -s PRECISE_F32=1 should not post a warning.
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '-s', 'PRECISE_F32=1', '-o', 'a.html'], stderr=PIPE).stderr
    self.assertNotContained('forcing separate asm output', stderr)

    # Manually doing separate asm should show a warning, if not targeting html
    warning = '--separate-asm works best when compiling to HTML'
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '--separate-asm'], stderr=PIPE).stderr
    self.assertContained(warning, stderr)
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '--separate-asm', '-o', 'a.html'], stderr=PIPE).stderr
    self.assertNotContained(warning, stderr)

    # test that the warning can be suppressed
    stderr = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '--separate-asm', '-Wno-separate-asm'], stderr=PIPE).stderr
    self.assertNotContained(warning, stderr)

  def test_canonicalize_nan_warning(self):
    create_test_file('src.cpp', r'''
#include <stdio.h>

union U {
  int x;
  float y;
} a;


int main() {
  a.x = 0x7FC01234;
  printf("%f\n", a.y);
  printf("0x%x\n", a.x);
  return 0;
}
''')

    stderr = run_process([PYTHON, EMCC, 'src.cpp', '-O1'], stderr=PIPE).stderr
    if not self.is_wasm_backend():
      self.assertContained("emcc: warning: cannot represent a NaN literal", stderr)
      stderr = run_process([PYTHON, EMCC, 'src.cpp', '-O1', '-g'], stderr=PIPE).stderr
      self.assertContained("emcc: warning: cannot represent a NaN literal", stderr)
      self.assertContained('//@line 12 "src.cpp"', stderr)
    else:
      out = run_js('a.out.js')
      self.assertContained('nan\n', out)
      self.assertContained('0x7fc01234\n', out)

  @no_wasm_backend('tests our python linking logic')
  def test_link_response_file_does_not_force_absolute_paths(self):
    with_space = 'with space'
    if not os.path.exists(with_space):
      os.makedirs(with_space)

    create_test_file(os.path.join(with_space, 'main.cpp'), '''
      int main() {
        return 0;
      }
    ''')

    Building.emcc(os.path.join(with_space, 'main.cpp'), ['-g'])

    with chdir(with_space):
      link_args = Building.link(['main.cpp.o'], 'all.bc', just_calculate=True)

    time.sleep(0.2) # Wait for Windows FS to release access to the directory
    shutil.rmtree(with_space)

    # We want only the relative path to be in the linker args, it should not be converted to an absolute path.
    if hasattr(self, 'assertCountEqual'):
      self.assertCountEqual(link_args, ['main.cpp.o'])
    else:
      # Python 2 compatibility
      self.assertItemsEqual(link_args, ['main.cpp.o'])

  def test_memory_growth_noasm(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O2', '-s', 'ALLOW_MEMORY_GROWTH=1'])
    src = open('a.out.js').read()
    assert 'use asm' not in src

  def test_EM_ASM_i64(self):
    create_test_file('src.cpp', '''
#include <stdint.h>
#include <emscripten.h>

int main() {
  EM_ASM({
    out('inputs: ' + $0 + ', ' + $1 + '.');
  }, int64_t(0x12345678ABCDEF1FLL));
}
''')
    stderr = self.expect_fail([PYTHON, EMCC, 'src.cpp', '-Oz'])
    if not self.is_wasm_backend():
      self.assertContained('EM_ASM should not receive i64s as inputs, they are not valid in JS', stderr)

  def test_eval_ctors_non_terminating(self):
    for wasm in (1, 0):
      if self.is_wasm_backend() and not wasm:
        continue
      print('wasm', wasm)
      src = r'''
        struct C {
          C() {
            volatile int y = 0;
            while (y == 0) {}
          }
        };
        C always;
        int main() {}
      '''
      create_test_file('src.cpp', src)
      run_process([PYTHON, EMCC, 'src.cpp', '-O2', '-s', 'EVAL_CTORS=1', '-profiling-funcs', '-s', 'WASM=%d' % wasm])

  @no_wasm_backend('EVAL_CTORS is monolithic with the wasm backend')
  def test_eval_ctors(self):
    for wasm in (1, 0):
      if self.is_wasm_backend() and not wasm:
        continue
      print('wasm', wasm)
      print('check no ctors is ok')

      # on by default in -Oz, but user-overridable

      def get_size(args):
        print('get_size', args)
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'WASM=%d' % wasm] + args)
        self.assertContained('hello, world!', run_js('a.out.js'))
        if wasm:
          codesize = self.count_wasm_contents('a.out.wasm', 'funcs')
          memsize = self.count_wasm_contents('a.out.wasm', 'memory-data')
        else:
          codesize = os.path.getsize('a.out.js')
          memsize = os.path.getsize('a.out.js.mem')
        return (codesize, memsize)

      def check_size(left, right):
        # can't measure just the mem out of the wasm, so ignore [1] for wasm
        if left[0] == right[0] and left[1] == right[1]:
          return 0
        if left[0] < right[0] and left[1] > right[1]:
          return -1 # smaller code, bigger mem
        if left[0] > right[0] and left[1] < right[1]:
          return 1
        assert False, [left, right]

      o2_size = get_size(['-O2'])
      assert check_size(get_size(['-O2']), o2_size) == 0, 'deterministic'
      assert check_size(get_size(['-O2', '-s', 'EVAL_CTORS=1']), o2_size) < 0, 'eval_ctors works if user asks for it'
      oz_size = get_size(['-Oz'])
      assert check_size(get_size(['-Oz']), oz_size) == 0, 'deterministic'
      assert check_size(get_size(['-Oz', '-s', 'EVAL_CTORS=1']), oz_size) == 0, 'eval_ctors is on by default in oz'
      assert check_size(get_size(['-Oz', '-s', 'EVAL_CTORS=0']), oz_size) == 1, 'eval_ctors can be turned off'

      linkable_size = get_size(['-Oz', '-s', 'EVAL_CTORS=1', '-s', 'LINKABLE=1'])
      assert check_size(get_size(['-Oz', '-s', 'EVAL_CTORS=0', '-s', 'LINKABLE=1']), linkable_size) == 1, 'noticeable difference in linkable too'

    def test_eval_ctor_ordering(self):
      # ensure order of execution remains correct, even with a bad ctor
      def test(p1, p2, p3, last, expected):
        src = r'''
          #include <stdio.h>
          #include <stdlib.h>
          volatile int total = 0;
          struct C {
            C(int x) {
              volatile int y = x;
              y++;
              y--;
              if (y == 0xf) {
                printf("you can't eval me ahead of time\n"); // bad ctor
              }
              total <<= 4;
              total += int(y);
            }
          };
          C __attribute__((init_priority(%d))) c1(0x5);
          C __attribute__((init_priority(%d))) c2(0x8);
          C __attribute__((init_priority(%d))) c3(%d);
          int main() {
            printf("total is 0x%%x.\n", total);
          }
        ''' % (p1, p2, p3, last)
        create_test_file('src.cpp', src)
        run_process([PYTHON, EMCC, 'src.cpp', '-O2', '-s', 'EVAL_CTORS=1', '-profiling-funcs', '-s', 'WASM=%d' % wasm])
        self.assertContained('total is %s.' % hex(expected), run_js('a.out.js'))
        shutil.copyfile('a.out.js', 'x' + hex(expected) + '.js')
        if wasm:
          shutil.copyfile('a.out.wasm', 'x' + hex(expected) + '.wasm')
          return self.count_wasm_contents('a.out.wasm', 'funcs')
        else:
          return open('a.out.js').read().count('function _')

      print('no bad ctor')
      first  = test(1000, 2000, 3000, 0xe, 0x58e) # noqa
      second = test(3000, 1000, 2000, 0xe, 0x8e5) # noqa
      third  = test(2000, 3000, 1000, 0xe, 0xe58) # noqa
      print(first, second, third)
      assert first == second and second == third
      print('with bad ctor')
      first  = test(1000, 2000, 3000, 0xf, 0x58f) # noqa; 2 will succeed
      second = test(3000, 1000, 2000, 0xf, 0x8f5) # noqa; 1 will succedd
      third  = test(2000, 3000, 1000, 0xf, 0xf58) # noqa; 0 will succeed
      print(first, second, third)
      assert first < second and second < third, [first, second, third]

  @no_wasm_backend('ctor evaller disabled, see https://github.com/emscripten-core/emscripten/issues/9527')
  @uses_canonical_tmp
  @with_env_modify({'EMCC_DEBUG': '1'})
  def test_eval_ctors_debug_output(self):
    for wasm in (1, 0):
      print('wasm', wasm)
      create_test_file('lib.js', r'''
mergeInto(LibraryManager.library, {
  external_thing: function() {}
});
''')
      create_test_file('src.cpp', r'''
  extern "C" void external_thing();
  struct C {
    C() { external_thing(); } // don't remove this!
  };
  C c;
  int main() {}
      ''')
      err = run_process([PYTHON, EMCC, 'src.cpp', '--js-library', 'lib.js', '-Oz', '-s', 'WASM=%d' % wasm], stderr=PIPE).stderr
      self.assertContained('external_thing', err) # the failing call should be mentioned
      if not wasm and not self.is_wasm_backend(): # asm.js will show a stack trace
        self.assertContained('ctorEval.js', err) # with a stack trace
      self.assertContained('ctor_evaller: not successful', err) # with logging

  def test_override_environment(self):
    create_test_file('main.cpp', r'''
      #include <emscripten.h>
      int main() {
        EM_ASM({
          out('environment is WEB? ' + ENVIRONMENT_IS_WEB);
          out('environment is WORKER? ' + ENVIRONMENT_IS_WORKER);
          out('environment is NODE? ' + ENVIRONMENT_IS_NODE);
          out('environment is SHELL? ' + ENVIRONMENT_IS_SHELL);
        });
      }
''')
    # use SINGLE_FILE since we don't want to depend on loading a side .wasm file on the environment in this test;
    # with the wrong env we have very odd failures
    run_process([PYTHON, EMCC, 'main.cpp', '-s', 'SINGLE_FILE=1'])
    src = open('a.out.js').read()
    envs = ['web', 'worker', 'node', 'shell']
    for env in envs:
      for engine in JS_ENGINES:
        if engine == V8_ENGINE:
          continue # ban v8, weird failures
        actual = 'NODE' if engine == NODE_JS else 'SHELL'
        print(env, actual, engine)
        module = {'ENVIRONMENT': env}
        if env != actual:
          # avoid problems with arguments detection, which may cause very odd failures with the wrong environment code
          module['arguments'] = []
        curr = 'var Module = %s;\n' % str(module)
        print('    ' + curr)
        create_test_file('test.js', curr + src)
        seen = run_js('test.js', engine=engine, stderr=PIPE, full_output=True, assert_returncode=None)
        self.assertContained('Module.ENVIRONMENT has been deprecated. To force the environment, use the ENVIRONMENT compile-time option (for example, -s ENVIRONMENT=web or -s ENVIRONMENT=node', seen)

  def test_warn_no_filesystem(self):
    WARNING = 'Filesystem support (FS) was not included. The problem is that you are using files from JS, but files were not used from C/C++, so filesystem support was not auto-included. You can force-include filesystem support with  -s FORCE_FILESYSTEM=1'

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])
    seen = run_js('a.out.js', stderr=PIPE)
    assert WARNING not in seen

    def test(contents):
      create_test_file('src.cpp', r'''
  #include <stdio.h>
  #include <emscripten.h>
  int main() {
    EM_ASM({ %s });
    printf("hello, world!\n");
    return 0;
  }
  ''' % contents)
      run_process([PYTHON, EMCC, 'src.cpp'])
      self.assertContained(WARNING, run_js('a.out.js', stderr=PIPE, assert_returncode=None))

    # might appear in handwritten code
    test("FS.init()")
    test("FS.createPreloadedFile('waka waka, just warning check')")
    test("FS.createDataFile('waka waka, just warning check')")
    test("FS.analyzePath('waka waka, just warning check')")
    test("FS.loadFilesFromDB('waka waka, just warning check')")
    # might appear in filesystem code from a separate script tag
    test("Module['FS_createDataFile']('waka waka, just warning check')")
    test("Module['FS_createPreloadedFile']('waka waka, just warning check')")

    # text is in the source when needed, but when forcing FS, it isn't there
    run_process([PYTHON, EMCC, 'src.cpp'])
    self.assertContained(WARNING, open('a.out.js').read())
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'FORCE_FILESYSTEM=1']) # forcing FS means no need
    self.assertNotContained(WARNING, open('a.out.js').read())
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'ASSERTIONS=0']) # no assertions, no need
    self.assertNotContained(WARNING, open('a.out.js').read())
    run_process([PYTHON, EMCC, 'src.cpp', '-O2']) # optimized, so no assertions
    self.assertNotContained(WARNING, open('a.out.js').read())

  def test_warn_module_print_err(self):
    ERROR = 'was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)'

    def test(contents, expected, args=[]):
      create_test_file('src.cpp', r'''
  #include <emscripten.h>
  int main() {
    EM_ASM({ %s });
    return 0;
  }
  ''' % contents)
      run_process([PYTHON, EMCC, 'src.cpp'] + args)
      self.assertContained(expected, run_js('a.out.js', stderr=STDOUT, assert_returncode=None))

    # error shown (when assertions are on)
    test("Module.print('x')", ERROR)
    test("Module['print']('x')", ERROR)
    test("Module.printErr('x')", ERROR)
    test("Module['printErr']('x')", ERROR)

    # when exported, all good
    test("Module['print']('print'); Module['printErr']('err'); ", 'print\nerr', ['-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=["print", "printErr"]'])

  def test_warn_unexported_main(self):
    WARNING = 'main() is in the input files, but "_main" is not in EXPORTED_FUNCTIONS, which means it may be eliminated as dead code. Export it if you want main() to run.'

    proc = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EXPORTED_FUNCTIONS=[]'], stderr=PIPE)
    self.assertContained(WARNING, proc.stderr)

  def test_arc4random(self):
    create_test_file('src.c', r'''
#include <stdlib.h>
#include <stdio.h>

int main() {
  printf("%d\n", arc4random());
  printf("%d\n", arc4random());
}
    ''')
    run_process([PYTHON, EMCC, 'src.c', '-Wno-implicit-function-declaration'])

    self.assertContained('0\n740882966\n', run_js('a.out.js'))

  ############################################################
  # Function eliminator tests
  ############################################################
  def normalize_line_endings(self, input):
    return input.replace('\r\n', '\n').replace('\n\n', '\n').replace('\n\n', '\n')

  def get_file_contents(self, file):
    file_contents = ""
    with open(file) as fout:
      file_contents = "".join(fout.readlines())

    file_contents = self.normalize_line_endings(file_contents)

    return file_contents

  def function_eliminator_test_helper(self, input_file, expected_output_file, use_hash_info=False):
    input_file = path_from_root('tests', 'optimizer', input_file)
    expected_output_file = path_from_root('tests', 'optimizer', expected_output_file)
    command = [path_from_root('tools', 'eliminate-duplicate-functions.js'), input_file, '--no-minimize-whitespace', '--use-asm-ast']

    if use_hash_info:
      command.append('--use-hash-info')

    proc = run_process(NODE_JS + command, stdin=PIPE, stderr=PIPE, stdout=PIPE)
    assert proc.stderr == '', proc.stderr
    expected_output = self.get_file_contents(expected_output_file)
    output = self.normalize_line_endings(proc.stdout)

    self.assertIdentical(expected_output, output)

  def test_function_eliminator_simple(self):
    self.function_eliminator_test_helper('test-function-eliminator-simple.js',
                                         'test-function-eliminator-simple-output.js')

  def test_function_eliminator_replace_function_call(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-function-call.js',
                                         'test-function-eliminator-replace-function-call-output.js')

  def test_function_eliminator_replace_function_call_two_passes(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-function-call-output.js',
                                         'test-function-eliminator-replace-function-call-two-passes-output.js')

  def test_function_eliminator_replace_array_value(self):
    output_file = 'output.js'

    try:
      shared.safe_copy(path_from_root('tests', 'optimizer', 'test-function-eliminator-replace-array-value.js'), output_file)

      tools.duplicate_function_eliminator.run(output_file)

      output_file_contents = self.get_file_contents(output_file)

      expected_file_contents = self.get_file_contents(path_from_root('tests', 'optimizer', 'test-function-eliminator-replace-array-value-output.js'))

      self.assertIdentical(output_file_contents, expected_file_contents)
    finally:
      tools.tempfiles.try_delete(output_file)

  def test_function_eliminator_replace_object_value_assignment(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-object-value-assignment.js',
                                         'test-function-eliminator-replace-object-value-assignment-output.js')

  def test_function_eliminator_variable_clash(self):
    self.function_eliminator_test_helper('test-function-eliminator-variable-clash.js',
                                         'test-function-eliminator-variable-clash-output.js')

  def test_function_eliminator_replace_variable_value(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-variable-value.js',
                                         'test-function-eliminator-replace-variable-value-output.js')

  @no_wasm_backend('tests native asm.js optimizer, which is never build for wasm backend')
  def test_function_eliminator_double_parsed_correctly(self):
    # This is a test that makes sure that when we perform final optimization on
    # the JS file, doubles are preserved (and not converted to ints).
    output_file = 'output.js'

    try:
      shared.safe_copy(path_from_root('tests', 'optimizer', 'test-function-eliminator-double-parsed-correctly.js'), output_file)

      # Run duplicate function elimination
      tools.duplicate_function_eliminator.run(output_file)

      # Run last opts
      shutil.move(tools.js_optimizer.run(output_file, ['last', 'asm']), output_file)
      output_file_contents = self.get_file_contents(output_file)

      # Compare
      expected_file_contents = self.get_file_contents(path_from_root('tests', 'optimizer', 'test-function-eliminator-double-parsed-correctly-output.js'))
      self.assertIdentical(expected_file_contents, output_file_contents)
    finally:
      tools.tempfiles.try_delete(output_file)

  # Now do the same, but using a pre-generated equivalent function hash info that
  # comes in handy for parallel processing
  def test_function_eliminator_simple_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-simple-with-hash-info.js',
                                         'test-function-eliminator-simple-output.js',
                                         use_hash_info=True)

  def test_function_eliminator_replace_function_call_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-function-call-with-hash-info.js',
                                         'test-function-eliminator-replace-function-call-output.js',
                                         use_hash_info=True)

  def test_function_eliminator_replace_function_call_two_passes_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-function-call-output-with-hash-info.js',
                                         'test-function-eliminator-replace-function-call-two-passes-output.js',
                                         use_hash_info=True)

  def test_function_eliminator_replace_object_value_assignment_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-object-value-assignment-with-hash-info.js',
                                         'test-function-eliminator-replace-object-value-assignment-output.js',
                                         use_hash_info=True)

  def test_function_eliminator_variable_clash_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-variable-clash-with-hash-info.js',
                                         'test-function-eliminator-variable-clash-output.js',
                                         use_hash_info=True)

  def test_function_eliminator_replace_variable_value_with_hash_info(self):
    self.function_eliminator_test_helper('test-function-eliminator-replace-variable-value-with-hash-info.js',
                                         'test-function-eliminator-replace-variable-value-output.js',
                                         use_hash_info=True)

  @no_wasm_backend('uses CYBERDWARF')
  def test_cyberdwarf_pointers(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'debugger', 'test_pointers.cpp'), '-Oz', '-s', 'CYBERDWARF=1',
                 '-std=c++11', '--pre-js', path_from_root('tests', 'debugger', 'test_preamble.js'), '-o', 'test_pointers.js'])
    run_js('test_pointers.js', engine=NODE_JS)

  @no_wasm_backend('uses CYBERDWARF')
  def test_cyberdwarf_union(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'debugger', 'test_union.cpp'), '-Oz', '-s', 'CYBERDWARF=1',
                 '-std=c++11', '--pre-js', path_from_root('tests', 'debugger', 'test_preamble.js'), '-o', 'test_union.js'])
    run_js('test_union.js', engine=NODE_JS)

  def test_source_file_with_fixed_language_mode(self):
    create_test_file('src_tmp_fixed_lang', '''
#include <string>
#include <iostream>

int main() {
  std::cout << "Test_source_fixed_lang_hello" << std::endl;
  return 0;
}
    ''')
    run_process([PYTHON, EMCC, '-Wall', '-std=c++14', '-x', 'c++', 'src_tmp_fixed_lang'])
    self.assertContained("Test_source_fixed_lang_hello", run_js('a.out.js'))

    stderr = self.expect_fail([PYTHON, EMCC, '-Wall', '-std=c++14', 'src_tmp_fixed_lang'])
    self.assertContained("Input file has an unknown suffix, don't know what to do with it!", stderr)

  def test_disable_inlining(self):
    create_test_file('test.c', r'''
#include <stdio.h>

void foo() {
  printf("foo\n");
}

int main() {
  foo();
  return 0;
}
''')
    # Without the 'INLINING_LIMIT=1', -O2 inlines foo()
    cmd = [PYTHON, EMCC, 'test.c', '-O2', '-o', 'test.bc', '-s', 'INLINING_LIMIT=1']
    if self.is_wasm_backend():
      cmd += ['-s', 'WASM_OBJECT_FILES=0']
    run_process(cmd)
    # If foo() had been wrongly inlined above, internalizing foo and running
    # global DCE makes foo DCE'd
    Building.llvm_opt('test.bc', ['-internalize', '-internalize-public-api-list=main', '-globaldce'], 'test2.bc')

    # To this test to be successful, foo() shouldn't have been inlined above and
    # foo() should be in the function list
    syms = Building.llvm_nm('test2.bc', include_internal=True)
    assert 'foo' in syms.defs, 'foo() should not be inlined'

  @no_wasm_backend('--separate-asm')
  def test_output_eol(self):
    # --separate-asm only makes sense without wasm (no asm.js with wasm)
    for params in [[], ['--separate-asm', '-s', 'WASM=0'], ['--proxy-to-worker'], ['--proxy-to-worker', '--separate-asm', '-s', 'WASM=0']]:
      for output_suffix in ['html', 'js']:
        for eol in ['windows', 'linux']:
          files = ['a.js']
          if '--separate-asm' in params:
            files += ['a.asm.js']
          if output_suffix == 'html':
            files += ['a.html']
          cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'a.' + output_suffix, '--output_eol', eol] + params
          run_process(cmd)
          for f in files:
            print(str(cmd) + ' ' + str(params) + ' ' + eol + ' ' + f)
            assert os.path.isfile(f)
            if eol == 'linux':
              expected_ending = '\n'
            else:
              expected_ending = '\r\n'

            ret = tools.line_endings.check_line_endings(f, expect_only=expected_ending)
            assert ret == 0

          for f in files:
            try_delete(f)

  @no_wasm_backend('asm2wasm specific')
  @uses_canonical_tmp
  def test_binaryen_opts(self):
    with env_modify({'EMCC_DEBUG': '1'}):
      for args, expect_js_opts, expect_wasm_opts, expect_only_wasm in [
          ([], False, False, True),
          (['-O0'], False, False, True),
          (['-O1'], False, True, True),
          (['-O2'], False, True, True),
          (['-O2', '--js-opts', '1'], True, True, False), # user asked
          (['-O2', '-s', 'EMTERPRETIFY=1'], True, True, False), # option forced
          (['-O2', '-s', 'EMTERPRETIFY=1', '-s', 'ALLOW_MEMORY_GROWTH=1'], True, True, False), # option forced, and also check growth does not interfere
          (['-O2', '-s', 'EVAL_CTORS=1'], False, True, True), # ctor evaller turned off since only-wasm
          (['-O3'], False, True, True),
          (['-Os'], False, True, True),
          (['-Oz'], False, True, True), # ctor evaller turned off since only-wasm
        ]:
        try_delete('a.out.js')
        try_delete('a.out.wast')
        cmd = [PYTHON, EMCC, path_from_root('tests', 'core', 'test_i64.c')] + args
        print(args, 'js opts:', expect_js_opts, 'only-wasm:', expect_only_wasm, '   ', ' '.join(cmd))
        err = run_process(cmd, stdout=PIPE, stderr=PIPE).stderr
        assert expect_js_opts == ('applying js optimization passes:' in err), err
        if not self.is_wasm_backend():
          assert expect_only_wasm == ('-emscripten-only-wasm' in err and '--wasm-only' in err), err # check both flag to fastcomp and to asm2wasm
        wast = run_process([os.path.join(Building.get_binaryen_bin(), 'wasm-dis'), 'a.out.wasm'], stdout=PIPE).stdout
        # i64s
        i64s = wast.count('(i64.')
        print('    seen i64s:', i64s)
        assert expect_only_wasm == (i64s > 30), 'i64 opts can be emitted in only-wasm mode, but not normally' # note we emit a few i64s even without wasm-only, when we replace udivmoddi (around 15 such)
        selects = wast.count('(select')
        print('    seen selects:', selects)
        if expect_wasm_opts:
          # when optimizing we should create selects
          self.assertGreater(selects, 15)
        else:
          # when not optimizing for size we should not
          self.assertEqual(selects, 0)
        # asm2wasm opt line
        asm2wasm_line = [line for line in err.split('\n') if 'asm2wasm' in line]
        asm2wasm_line = '' if not asm2wasm_line else asm2wasm_line[0]
        if '-O0' in args or '-O' not in str(args):
          assert '-O' not in asm2wasm_line, 'no opts should be passed to asm2wasm: ' + asm2wasm_line
        else:
          opts_str = args[0]
          assert opts_str.startswith('-O')
          assert opts_str in asm2wasm_line, 'expected opts: ' + asm2wasm_line

  @no_wasm_backend('fastcomp specific')
  def test_binaryen_and_precise_f32(self):
    for args, expect in [
        ([], True),
        (['-s', 'PRECISE_F32=0'], True), # disabled, but no asm.js, so we definitely want f32
        (['-s', 'PRECISE_F32=1'], True),
        (['-s', 'PRECISE_F32=2'], True),
      ]:
      print(args, expect)
      try_delete('a.out.js')
      err = run_process([PYTHON, EMCC, '-v', path_from_root('tests', 'hello_world.cpp'), '-s', 'BINARYEN=1'] + args, stderr=PIPE).stderr
      assert expect == (' -emscripten-precise-f32' in err), err
      self.assertContained('hello, world!', run_js('a.out.js'))

  def test_binaryen_names(self):
    sizes = {}
    for args, expect_names in [
        ([], False),
        (['-g'], True),
        (['-O1'], False),
        (['-O2'], False),
        (['-O2', '-g'], True),
        (['-O2', '-g1'], False),
        (['-O2', '-g2'], True),
        (['-O2', '--profiling'], True),
        (['-O2', '--profiling-funcs'], True),
      ]:
      print(args, expect_names)
      try_delete('a.out.js')
      # we use dlmalloc here, as emmalloc has a bunch of asserts that contain the text "malloc" in them, which makes counting harder
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp')] + args + ['-s', 'MALLOC="dlmalloc"'])
      code = open('a.out.wasm', 'rb').read()
      if expect_names:
        # name section adds the name of malloc (there is also another one for the export)
        self.assertEqual(code.count(b'malloc'), 2)
      else:
        # should be just malloc for the export
        self.assertEqual(code.count(b'malloc'), 1)
      sizes[str(args)] = os.path.getsize('a.out.wasm')
    print(sizes)
    self.assertLess(sizes["['-O2']"], sizes["['-O2', '--profiling-funcs']"], 'when -profiling-funcs, the size increases due to function names')

  def test_binaryen_warn_mem(self):
    # if user changes TOTAL_MEMORY at runtime, the wasm module may not accept the memory import if it is too big/small
    create_test_file('pre.js', 'var Module = { TOTAL_MEMORY: 50 * 1024 * 1024 };\n')
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'TOTAL_MEMORY=' + str(16 * 1024 * 1024), '--pre-js', 'pre.js', '-s', 'WASM_ASYNC_COMPILATION=0'])
    out = run_js('a.out.js', full_output=True, stderr=PIPE, assert_returncode=None)
    self.assertContained('LinkError', out)
    self.assertContained('Memory size incompatibility issues may be due to changing TOTAL_MEMORY at runtime to something too large. Use ALLOW_MEMORY_GROWTH to allow any size memory (and also make sure not to set TOTAL_MEMORY at runtime to something smaller than it was at compile time).', out)
    self.assertNotContained('hello, world!', out)
    # and with memory growth, all should be good
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'TOTAL_MEMORY=' + str(16 * 1024 * 1024), '--pre-js', 'pre.js', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM_ASYNC_COMPILATION=0'])
    self.assertContained('hello, world!', run_js('a.out.js'))

  @no_wasm_backend('asm.js specific')
  def test_binaryen_asmjs_outputs(self):
    # Test that an .asm.js file is outputted exactly when it is requested.
    for args, output_asmjs in [
      ([], False),
      (['-s', 'MAIN_MODULE=2'], False),
    ]:
      with temp_directory(self.get_dir()) as temp_dir:
        cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', os.path.join(temp_dir, 'a.js')] + args
        print(' '.join(cmd))
        run_process(cmd)
        if output_asmjs:
          self.assertExists(os.path.join(temp_dir, 'a.asm.js'))
        self.assertNotExists(os.path.join(temp_dir, 'a.temp.asm.js'))

    # Test that outputting to .wasm does not nuke an existing .asm.js file, if
    # user wants to manually dual-deploy both to same directory.
    with temp_directory(self.get_dir()) as temp_dir:
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=0', '-o', os.path.join(temp_dir, 'a.js'), '--separate-asm']
      print(' '.join(cmd))
      run_process(cmd)
      self.assertExists(os.path.join(temp_dir, 'a.asm.js'))

      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', os.path.join(temp_dir, 'a.js')]
      print(' '.join(cmd))
      run_process(cmd)
      self.assertExists(os.path.join(temp_dir, 'a.asm.js'))
      self.assertExists(os.path.join(temp_dir, 'a.wasm'))

      assert not os.path.exists(os.path.join(temp_dir, 'a.temp.asm.js'))

  def test_binaryen_mem(self):
    for args, expect_initial, expect_max in [
        (['-s', 'TOTAL_MEMORY=20971520'], 320, 320),
        (['-s', 'TOTAL_MEMORY=20971520', '-s', 'ALLOW_MEMORY_GROWTH=1'], 320, None),
        (['-s', 'TOTAL_MEMORY=20971520',                                '-s', 'WASM_MEM_MAX=41943040'], 320, 640),
        (['-s', 'TOTAL_MEMORY=20971520', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM_MEM_MAX=41943040'], 320, 640),
      ]:
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM=1', '-O2'] + args
      print(' '.join(cmd))
      run_process(cmd)
      wast = run_process([os.path.join(Building.get_binaryen_bin(), 'wasm-dis'), 'a.out.wasm'], stdout=PIPE).stdout
      for line in wast:
        if '(import "env" "memory" (memory ' in line:
          parts = line.strip().replace('(', '').replace(')', '').split(' ')
          print(parts)
          self.assertEqual(parts[5], str(expect_initial))
          if not expect_max:
            self.assertEqual(len(parts), 6)
          else:
            self.assertEqual(parts[6], str(expect_max))

  def test_invalid_mem(self):
    # A large amount is fine, multiple of 16MB or not
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=33MB'])
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=32MB'])

    # But not in asm.js
    if not self.is_wasm_backend():
      ret = self.expect_fail([PYTHON, EMCC, '-s', 'WASM=0', path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=33MB'])
      self.assertContained('TOTAL_MEMORY must be a multiple of 16MB', ret)

    # A tiny amount is fine in wasm
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=65536', '-s', 'TOTAL_STACK=1024'])
    # And the program works!
    self.assertContained('hello, world!', run_js('a.out.js'))

    # But not in asm.js
    if not self.is_wasm_backend():
      ret = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=65536', '-s', 'WASM=0'])
      self.assertContained('TOTAL_MEMORY must be at least 16MB', ret)

    # Must be a multiple of 64KB
    ret = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'TOTAL_MEMORY=33554433']) # 32MB + 1 byte
    self.assertContained('TOTAL_MEMORY must be a multiple of 64KB', ret)

    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM_MEM_MAX=33MB'])

    ret = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'WASM_MEM_MAX=34603009']) # 33MB + 1 byte
    self.assertContained('WASM_MEM_MAX must be a multiple of 64KB', ret)

  def test_invalid_output_dir(self):
    ret = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', os.path.join('NONEXISTING_DIRECTORY', 'out.js')])
    self.assertContained('specified output file (NONEXISTING_DIRECTORY%sout.js) is in a directory that does not exist' % os.path.sep, ret)

  def test_binaryen_ctors(self):
    # ctor order must be identical to js builds, deterministically
    create_test_file('src.cpp', r'''
      #include <stdio.h>
      struct A {
        A() { puts("constructing A!"); }
      };
      A a;
      struct B {
        B() { puts("constructing B!"); }
      };
      B b;
      int main() {}
    ''')
    run_process([PYTHON, EMCC, 'src.cpp'])
    correct = run_js('a.out.js')
    for args in [[], ['-s', 'RELOCATABLE=1']]:
      print(args)
      run_process([PYTHON, EMCC, 'src.cpp', '-s', 'WASM=1', '-o', 'b.out.js'] + args)
      seen = run_js('b.out.js')
      assert correct == seen, correct + '\n vs \n' + seen

  # test debug info and debuggability of JS output
  @uses_canonical_tmp
  def test_binaryen_debug(self):
    with env_modify({'EMCC_DEBUG': '1'}):
      for args, expect_dash_g, expect_emit_text, expect_clean_js, expect_whitespace_js, expect_closured in [
          (['-O0'], False, False, False, True, False),
          (['-O0', '-g1'], False, False, False, True, False),
          (['-O0', '-g2'], True, False, False, True, False), # in -g2+, we emit -g to asm2wasm so function names are saved
          (['-O0', '-g'], True, True, False, True, False),
          (['-O0', '--profiling-funcs'], True, False, False, True, False),
          (['-O1'],        False, False, False, True, False),
          (['-O2'],        False, False, True,  False, False),
          (['-O2', '-g1'], False, False, True,  True, False),
          (['-O2', '-g'],  True,  True,  False, True, False),
          (['-O2', '--closure', '1'],         False, False, True, False, True),
          (['-O2', '--closure', '1', '-g1'],  False, False, True, True,  True),
          (['-O2', '--js-opts', '1'], False, False, True,  False, False),
        ]:
        print(args, expect_dash_g, expect_emit_text)
        try_delete('a.out.wast')
        cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'WASM=1'] + args
        print(' '.join(cmd))
        err = run_process(cmd, stdout=PIPE, stderr=PIPE).stderr
        if not self.is_wasm_backend():
          asm2wasm_line = [x for x in err.split('\n') if 'asm2wasm' in x][0]
          asm2wasm_line = asm2wasm_line.strip() + ' ' # ensure it ends with a space, for simpler searches below
          print('|' + asm2wasm_line + '|')
          assert expect_dash_g == (' -g ' in asm2wasm_line)
          assert expect_emit_text == (' -S ' in asm2wasm_line)
          if expect_emit_text:
            text = open('a.out.wast').read()
            assert ';;' in text, 'must see debug info comment'
            assert 'hello_world.cpp:12' in text, 'must be file:line info'
        js = open('a.out.js').read()
        assert expect_clean_js == ('// ' not in js), 'cleaned-up js must not have comments'
        assert expect_whitespace_js == ('{\n  ' in js), 'whitespace-minified js must not have excess spacing'
        assert expect_closured == ('var a;' in js or 'var a,' in js or 'var a=' in js or 'var a ' in js), 'closured js must have tiny variable names'

  @uses_canonical_tmp
  def test_binaryen_ignore_implicit_traps(self):
    sizes = []
    with env_modify({'EMCC_DEBUG': '1'}):
      for args, expect in [
          ([], False),
          (['-s', 'BINARYEN_IGNORE_IMPLICIT_TRAPS=1'], True),
        ]:
        print(args, expect)
        cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'WASM=1', '-O3'] + args
        print(' '.join(cmd))
        err = run_process(cmd, stdout=PIPE, stderr=PIPE).stderr
        self.assertContainedIf('--ignore-implicit-traps ', err, expect)
        sizes.append(os.path.getsize('a.out.wasm'))
    print('sizes:', sizes)
    # sizes must be different, as the flag has an impact
    self.assertEqual(len(set(sizes)), 2)

  @no_fastcomp('BINARYEN_PASSES is used to optimize only in the wasm backend (fastcomp uses flags to asm2wasm)')
  def test_binaryen_passes(self):
    def build(args=[]):
      return run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'WASM=1', '-O3'] + args, stdout=PIPE).stdout

    build()
    base_size = os.path.getsize('a.out.wasm')
    build(['-s', 'BINARYEN_PASSES="--metrics"'])
    replace_size = os.path.getsize('a.out.wasm')
    # replacing the default -O3 etc. increases code size
    self.assertLess(base_size, replace_size)
    out = build(['-s', 'BINARYEN_EXTRA_PASSES="--metrics"'])
    add_size = os.path.getsize('a.out.wasm')
    # adding --metrics does not affect code size
    self.assertEqual(base_size, add_size)
    # and --metrics output appears
    self.assertContained('[funcs]', out)

  def assertFileContents(self, filename, contents):
    if os.environ.get('EMTEST_REBASELINE'):
      with open(filename, 'w') as f:
        f.write(contents)
      return

    expected_content = open(filename).read()
    self.assertTextDataIdentical(expected_content, contents,
                                 "Run with EMTEST_REBASELINE=1 to automatically update expectations")

  def run_metadce_test(self, filename, args, expected_sent, expected_exists,
                       expected_not_exists, expected_size, expected_imports,
                       expected_exports, expected_funcs):
    size_slack = 0.05

    # in -Os, -Oz, we remove imports wasm doesn't need
    print('Running metadce test: %s:' % filename, args, expected_sent, expected_exists, expected_not_exists, expected_size, expected_imports, expected_exports, expected_funcs)
    filename = path_from_root('tests', 'other', 'metadce', filename)

    def clean_arg(arg):
      return arg.replace('-', '')

    def args_to_filename(args):
      result = ''
      for a in args:
        if a == '-s':
          continue
        a = a.replace('-', '')
        a = a.replace('=1', '')
        a = a.replace('=[]', '_NONE')
        a = a.replace('=', '_')
        if a:
          result += '_' + a

      return result

    expected_basename = os.path.splitext(filename)[0]
    if not self.is_wasm_backend():
      expected_basename += '_fastcomp'
    expected_basename += args_to_filename(args)

    run_process([PYTHON, EMCC, filename, '-g2'] + args)
    # find the imports we send from JS
    js = open('a.out.js').read()
    start = js.find('asmLibraryArg = ')
    end = js.find('}', start) + 1
    start = js.find('{', start)
    relevant = js[start + 2:end - 2]
    relevant = relevant.replace(' ', '').replace('"', '').replace("'", '').split(',')
    sent = [x.split(':')[0].strip() for x in relevant]
    sent = [x for x in sent if x]
    sent.sort()

    if expected_sent is not None:
      sent_file = expected_basename + '.sent'
      sent_data = '\n'.join(sent) + '\n'
      self.assertFileContents(sent_file, sent_data)
      self.assertEqual(len(sent), expected_sent)

    for exists in expected_exists:
      self.assertIn(exists, sent)
    for not_exists in expected_not_exists:
      self.assertNotIn(not_exists, sent)

    wasm_size = os.path.getsize('a.out.wasm')
    if expected_size is not None:
      ratio = abs(wasm_size - expected_size) / float(expected_size)
      print('  seen wasm size: %d (expected: %d), ratio to expected: %f' % (wasm_size, expected_size, ratio))
    self.assertLess(ratio, size_slack)
    imports, exports, funcs = parse_wasm('a.out.wasm')
    imports.sort()
    exports.sort()
    funcs.sort()

    # filter out _NNN suffixed that can be the result of bitcode linking when
    # internal symbol names collide.
    def strip_numeric_suffixes(funcname):
      parts = funcname.split('_')
      while parts:
        if parts[-1].isdigit():
          parts.pop()
        else:
          break
      return '_'.join(parts)

    funcs = [strip_numeric_suffixes(f) for f in funcs]

    if expected_imports is not None:
      filename = expected_basename + '.imports'
      data = '\n'.join(imports) + '\n'
      self.assertFileContents(filename, data)
      self.assertEqual(len(imports), expected_imports)

    if expected_exports is not None:
      filename = expected_basename + '.exports'
      data = '\n'.join(exports) + '\n'
      self.assertFileContents(filename, data)
      self.assertEqual(len(exports), expected_exports)

    if expected_funcs is not None:
      filename = expected_basename + '.funcs'
      data = '\n'.join(funcs) + '\n'
      self.assertFileContents(filename, data)
      self.assertEqual(len(funcs), expected_funcs)

  @parameterized({
    'O0': ([],       6, [], ['waka'],  9211,  5, 12, 18), # noqa
    'O1': (['-O1'],  4, [], ['waka'],  7886,  2, 11, 12), # noqa
    'O2': (['-O2'],  4, [], ['waka'],  7871,  2, 11, 11), # noqa
    # in -O3, -Os and -Oz we metadce, and they shrink it down to the minimal output we want
    'O3': (['-O3'],  2, [], [],          85,  0,  2,  2), # noqa
    'Os': (['-Os'],  2, [], [],          85,  0,  2,  2), # noqa
    'Oz': (['-Oz'],  2, [], [],          85,  0,  2,  2), # noqa
  })
  @no_fastcomp()
  def test_binaryen_metadce_minimal(self, *args):
    self.run_metadce_test('minimal.c', *args)

  @parameterized({
    'O0': ([],      25, ['abort'], ['waka'], 22712, 16, 15, 29), # noqa
    'O1': (['-O1'], 16, ['abort'], ['waka'], 10450,  4, 11, 12), # noqa
    'O2': (['-O2'], 16, ['abort'], ['waka'], 10440,  4, 11, 12), # noqa
    # in -O3, -Os and -Oz we metadce, and they shrink it down to the minimal output we want
    'O3': (['-O3'],  4, [],        [],          55,  0,  1, 1), # noqa
    'Os': (['-Os'],  4, [],        [],          55,  0,  1, 1), # noqa
    'Oz': (['-Oz'],  4, [],        [],          55,  0,  1, 1), # noqa
  })
  @no_wasm_backend()
  def test_binaryen_metadce_minimal_fastcomp(self, *args):
    self.run_metadce_test('minimal.c', *args)

  @no_fastcomp()
  def test_binaryen_metadce_cxx(self):
    # test on libc++: see effects of emulated function pointers
    self.run_metadce_test('hello_libcxx.cpp', ['-O2'], 19, [], ['waka'], 226582, 17, 32, None) # noqa

  @parameterized({
    'normal': (['-O2'], 38, ['abort'], ['waka'], 186423, 23, 34, 539), # noqa
    'emulated_function_pointers':
              (['-O2', '-s', 'EMULATED_FUNCTION_POINTERS=1'],
                        38, ['abort'], ['waka'], 188310, 23, 35, 519), # noqa
  })
  @no_wasm_backend()
  def test_binaryen_metadce_cxx_fastcomp(self, *args):
    # test on libc++: see effects of emulated function pointers
    self.run_metadce_test('hello_libcxx.cpp', *args)

  @parameterized({
    'O0': ([],       9, [], ['waka'], 22185,  8,  17, 57), # noqa
    'O1': (['-O1'],  7, [], ['waka'], 10415,  6,  14, 31), # noqa
    'O2': (['-O2'],  7, [], ['waka'], 10183,  6,  14, 24), # noqa
    'O3': (['-O3'],  4, [], [],        1957,  4,   2, 12), # noqa; in -O3, -Os and -Oz we metadce
    'Os': (['-Os'],  4, [], [],        1963,  4,   2, 12), # noqa
    'Oz': (['-Oz'],  4, [], [],        1929,  4,   2, 12), # noqa
    # finally, check what happens when we export nothing. wasm should be almost empty
    'export_nothing':
          (['-Os', '-s', 'EXPORTED_FUNCTIONS=[]'],
                     2, [], [],          61,  0,   1,  1), # noqa
    # we don't metadce with linkable code! other modules may want stuff
    # don't compare the # of functions in a main module, which changes a lot
    # TODO(sbc): Investivate why the number of exports is order of magnitude
    # larger for wasm backend.
    'main_module_1': (['-O3', '-s', 'MAIN_MODULE=1'],  174, [], [], 517336, None, 1518, None), # noqa
    'main_module_2': (['-O3', '-s', 'MAIN_MODULE=2'],   12, [], [],  10770,   12,   10, None), # noqa
  })
  @no_fastcomp()
  def test_binaryen_metadce_hello(self, *args):
    self.run_metadce_test('hello_world.cpp', *args)

  @parameterized({
    'O0': ([],      27, ['abort'], ['waka'], 42701,  18,   17, 56), # noqa
    'O1': (['-O1'], 19, ['abort'], ['waka'], 13199,   9,   14, 32), # noqa
    'O2': (['-O2'], 19, ['abort'], ['waka'], 12425,   9,   14, 27), # noqa
    'O3': (['-O3'],  7, [],        [],        2045,   6,    2, 14), # noqa; in -O3, -Os and -Oz we metadce
    'Os': (['-Os'],  7, [],        [],        2064,   6,    2, 15), # noqa
    'Oz': (['-Oz'],  7, [],        [],        2045,   6,    2, 14), # noqa
    # finally, check what happens when we export nothing. wasm should be almost empty
    'export_nothing':
           (['-Os', '-s', 'EXPORTED_FUNCTIONS=[]'],
                      4, [],        [],           8,   0,    0,  0), # noqa; totally empty!
    # we don't metadce with linkable code! other modules may want stuff
    # don't compare the # of functions in a main module, which changes a lot
    'main_module_1': (['-O3', '-s', 'MAIN_MODULE=1'], 1602, [], [], 226403, None, 107, None), # noqa
    'main_module_2': (['-O3', '-s', 'MAIN_MODULE=2'],   13, [], [],  10017,   13,   9,   20), # noqa
  })
  @no_wasm_backend()
  def test_binaryen_metadce_hello_fastcomp(self, *args):
    self.run_metadce_test('hello_world.cpp', *args)

  # ensures runtime exports work, even with metadce
  def test_extra_runtime_exports(self):
    exports = ['stackSave', 'stackRestore', 'stackAlloc']
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'WASM=1', '-Os', '-s', 'EXTRA_EXPORTED_RUNTIME_METHODS=%s' % str(exports)])
    js = open('a.out.js').read()
    for export in exports:
      assert ('Module["%s"]' % export) in js, export

  def test_legalize_js_ffi(self):
    # test disabling of JS FFI legalization
    wasm_dis = os.path.join(Building.get_binaryen_bin(), 'wasm-dis')
    for (args, js_ffi) in [
        (['-s', 'LEGALIZE_JS_FFI=1', '-s', 'SIDE_MODULE=1', '-O1', '-s', 'EXPORT_ALL=1'], True),
        (['-s', 'LEGALIZE_JS_FFI=0', '-s', 'SIDE_MODULE=1', '-O1', '-s', 'EXPORT_ALL=1'], False),
        (['-s', 'LEGALIZE_JS_FFI=0', '-s', 'SIDE_MODULE=1', '-O0', '-s', 'EXPORT_ALL=1'], False),
        (['-s', 'LEGALIZE_JS_FFI=0', '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0', '-O0'], False),
      ]:
      if self.is_wasm_backend() and 'SIDE_MODULE=1' in args:
        continue
      print(args)
      try_delete('a.out.wasm')
      try_delete('a.out.wast')
      cmd = [PYTHON, EMCC, path_from_root('tests', 'other', 'ffi.c'), '-g', '-o', 'a.out.js'] + args
      print(' '.join(cmd))
      run_process(cmd)
      run_process([wasm_dis, 'a.out.wasm', '-o', 'a.out.wast'])
      text = open('a.out.wast').read()
      # remove internal comments and extra whitespace
      text = re.sub(r'\(;[^;]+;\)', '', text)
      text = re.sub(r'\$var\$*.', '', text)
      text = re.sub(r'param \$\d+', 'param ', text)
      text = re.sub(r' +', ' ', text)
      # print("text: %s" % text)
      e_add_f32 = re.search(r'func \$_?add_f \(type \$\d+\) \(param f32\) \(param f32\) \(result f32\)', text)
      i_i64_i32 = re.search(r'import .*"_?import_ll" .*\(param i32 i32\) \(result i32\)', text)
      i_f32_f64 = re.search(r'import .*"_?import_f" .*\(param f64\) \(result f64\)', text)
      i_i64_i64 = re.search(r'import .*"_?import_ll" .*\(param i64\) \(result i64\)', text)
      i_f32_f32 = re.search(r'import .*"_?import_f" .*\(param f32\) \(result f32\)', text)
      e_i64_i32 = re.search(r'func \$_?add_ll \(type \$\d+\) \(param i32\) \(param i32\) \(param i32\) \(param i32\) \(result i32\)', text)
      e_f32_f64 = re.search(r'func \$legalstub\$_?add_f \(type \$\d+\) \(param f64\) \(param f64\) \(result f64\)', text)
      e_i64_i64 = re.search(r'func \$_?add_ll \(type \$\d+\) \(param i64\) \(param i64\) \(result i64\)', text)
      assert e_add_f32, 'add_f export missing'
      if js_ffi:
        assert i_i64_i32,     'i64 not converted to i32 in imports'
        assert i_f32_f64,     'f32 not converted to f64 in imports'
        assert not i_i64_i64, 'i64 not converted to i32 in imports'
        assert not i_f32_f32, 'f32 not converted to f64 in imports'
        assert e_i64_i32,     'i64 not converted to i32 in exports'
        assert not e_f32_f64, 'f32 not converted to f64 in exports'
        assert not e_i64_i64, 'i64 not converted to i64 in exports'
      else:
        assert not i_i64_i32, 'i64 converted to i32 in imports'
        assert not i_f32_f64, 'f32 converted to f64 in imports'
        assert i_i64_i64,     'i64 converted to i32 in imports'
        assert i_f32_f32,     'f32 converted to f64 in imports'
        assert not e_i64_i32, 'i64 converted to i32 in exports'
        assert not e_f32_f64, 'f32 converted to f64 in exports'
        assert e_i64_i64,     'i64 converted to i64 in exports'

  def test_no_legalize_js_ffi(self):
    # test minimal JS FFI legalization for invoke and dyncalls
    if self.is_wasm_backend():
      self.skipTest('not testing legalize with main module and wasm backend')
    wasm_dis = os.path.join(Building.get_binaryen_bin(), 'wasm-dis')
    for (args, js_ffi) in [
        (['-s', 'LEGALIZE_JS_FFI=0', '-s', 'MAIN_MODULE=2', '-O3', '-s', 'DISABLE_EXCEPTION_CATCHING=0'], False),
      ]:
      print(args)
      try_delete('a.out.wasm')
      try_delete('a.out.wast')
      with env_modify({'EMCC_FORCE_STDLIBS': 'libc++'}):
        cmd = [PYTHON, EMCC, path_from_root('tests', 'other', 'noffi.cpp'), '-g', '-o', 'a.out.js'] + args
      print(' '.join(cmd))
      run_process(cmd)
      run_process([wasm_dis, 'a.out.wasm', '-o', 'a.out.wast'])
      text = open('a.out.wast').read()
      # remove internal comments and extra whitespace
      text = re.sub(r'\(;[^;]+;\)', '', text)
      text = re.sub(r'\$var\$*.', '', text)
      text = re.sub(r'param \$\d+', 'param ', text)
      text = re.sub(r' +', ' ', text)
      # print("text: %s" % text)
      i_legalimport_i64 = re.search(r'\(import.*\$legalimport\$invoke_j.*', text)
      e_legalstub_i32 = re.search(r'\(func.*\$legalstub\$dyn.*\(type \$\d+\).*\(result i32\)', text)
      assert i_legalimport_i64, 'legal import not generated for invoke call'
      assert e_legalstub_i32, 'legal stub not generated for dyncall'

  def test_export_aliasee(self):
    # build side module
    args = ['-s', 'SIDE_MODULE=1']
    cmd = [PYTHON, EMCC, path_from_root('tests', 'other', 'alias', 'side.c'), '-g', '-o', 'side.wasm'] + args
    print(' '.join(cmd))
    run_process(cmd)

    # build main module
    args = ['-s', 'EXPORTED_FUNCTIONS=["_main", "_foo"]', '-s', 'MAIN_MODULE=2', '-s', 'EXIT_RUNTIME=1']
    cmd = [PYTHON, EMCC, path_from_root('tests', 'other', 'alias', 'main.c'), '-o', 'main.js'] + args
    print(' '.join(cmd))
    run_process(cmd)

    # run the program
    self.assertContained('success', run_js('main.js'))

  def test_sysconf_phys_pages(self):
    def run(args, expected):
      if self.is_wasm_backend() and 'WASM=0' in args:
        return
      cmd = [PYTHON, EMCC, path_from_root('tests', 'unistd', 'sysconf_phys_pages.c')] + args
      print(str(cmd))
      run_process(cmd)
      result = run_js('a.out.js').strip()
      self.assertEqual(result,  str(expected) + ', errno: 0')

    run([], 1024)
    run(['-s', 'TOTAL_MEMORY=32MB'], 2048)
    run(['-s', 'TOTAL_MEMORY=32MB', '-s', 'ALLOW_MEMORY_GROWTH=1'], (2 * 1024 * 1024 * 1024 - 65536) // 16384)
    run(['-s', 'TOTAL_MEMORY=32MB', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM=0'], (2 * 1024 * 1024 * 1024 - 16777216) // 16384)
    run(['-s', 'TOTAL_MEMORY=32MB', '-s', 'BINARYEN=1'], 2048)
    run(['-s', 'TOTAL_MEMORY=32MB', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'BINARYEN=1'], (2 * 1024 * 1024 * 1024 - 65536) // 16384)
    run(['-s', 'TOTAL_MEMORY=32MB', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'BINARYEN=1', '-s', 'WASM_MEM_MAX=128MB'], 2048 * 4)

  def test_wasm_target_and_STANDALONE_WASM(self):
    # STANDALONE_WASM means we never minify imports and exports.
    for opts, potentially_expect_minified_exports_and_imports in (
      ([],                               False),
      (['-s', 'STANDALONE_WASM'],        False),
      (['-O2'],                          False),
      (['-O3'],                          True),
      (['-O3', '-s', 'STANDALONE_WASM'], False),
      (['-Os'],                          True),
    ):
      if 'STANDALONE_WASM' in opts and not self.is_wasm_backend():
        continue
      # targeting .wasm (without .js) means we enable STANDALONE_WASM automatically, and don't minify imports/exports
      for target in ('out.js', 'out.wasm'):
        expect_minified_exports_and_imports = potentially_expect_minified_exports_and_imports and target.endswith('.js')
        standalone = target.endswith('.wasm') or 'STANDALONE_WASM' in opts
        print(opts, potentially_expect_minified_exports_and_imports, target, ' => ', expect_minified_exports_and_imports, standalone)

        self.clear()
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-o', target] + opts)
        self.assertExists('out.wasm')
        if target.endswith('.wasm'):
          assert not os.path.exists('out.js'), 'only wasm requested'
        wast = run_process([os.path.join(Building.get_binaryen_bin(), 'wasm-dis'), 'out.wasm'], stdout=PIPE).stdout
        wast_lines = wast.split('\n')
        exports = [line.strip().split(' ')[1].replace('"', '') for line in wast_lines if "(export " in line]
        imports = [line.strip().split(' ')[2].replace('"', '') for line in wast_lines if "(import " in line]
        exports_and_imports = exports + imports
        print('  exports', exports)
        print('  imports', imports)
        if expect_minified_exports_and_imports:
          assert 'a' in exports_and_imports
        else:
          assert 'a' not in exports_and_imports
        assert 'memory' in exports_and_imports or 'fd_write' in exports_and_imports, 'some things are not minified anyhow'
        # verify the wasm runs with the JS
        if target.endswith('.js'):
          self.assertContained('hello, world!', run_js('out.js'))
        # verify a standalone wasm
        if standalone:
          for engine in shared.WASM_ENGINES:
            print(engine)
            self.assertContained('hello, world!', run_js('out.wasm', engine=engine))

  def test_wasm_targets_side_module(self):
    # side modules do allow a wasm target
    for opts, target in [([], 'a.out.wasm'), (['-o', 'lib.wasm'], 'lib.wasm')]:
      # specified target
      print('building: ' + target)
      self.clear()
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'SIDE_MODULE=1'] + opts)
      for x in os.listdir('.'):
        assert not x.endswith('.js'), 'we should not emit js when making a wasm side module: ' + x
      self.assertIn(b'dylink', open(target, 'rb').read())

  @no_fastcomp('uses upstream specific option: WASM_OBJECT_FILES')
  def test_wasm_backend_lto(self):
    # test building of non-wasm-object-files libraries, building with them, and running them

    src = path_from_root('tests', 'hello_libcxx.cpp')
    # test codegen in lto mode, and compare to normal (wasm object) mode
    for args in [[], ['-O1'], ['-O2'], ['-O3'], ['-Os'], ['-Oz']]:
      print(args)

      print('wasm in object')
      run_process([PYTHON, EMXX, src] + args + ['-c', '-o', 'hello_obj.o'])
      self.assertTrue(shared.Building.is_wasm('hello_obj.o'))
      self.assertFalse(shared.Building.is_bitcode('hello_obj.o'))

      print('bitcode in object')
      run_process([PYTHON, EMXX, src] + args + ['-c', '-o', 'hello_bitcode.o', '-s', 'WASM_OBJECT_FILES=0'])
      self.assertFalse(shared.Building.is_wasm('hello_bitcode.o'))
      self.assertTrue(shared.Building.is_bitcode('hello_bitcode.o'))

      print('use bitcode object (LTO)')
      run_process([PYTHON, EMXX, 'hello_bitcode.o'] + args + ['-s', 'WASM_OBJECT_FILES=0'])
      self.assertContained('hello, world!', run_js('a.out.js'))
      print('use bitcode object (non-LTO)')
      run_process([PYTHON, EMXX, 'hello_bitcode.o'] + args + ['-s', 'WASM_OBJECT_FILES=1'])
      self.assertContained('hello, world!', run_js('a.out.js'))

      print('use native object (LTO)')
      run_process([PYTHON, EMXX, 'hello_obj.o'] + args + ['-s', 'WASM_OBJECT_FILES=0'])
      self.assertContained('hello, world!', run_js('a.out.js'))
      print('use native object (non-LTO)')
      run_process([PYTHON, EMXX, 'hello_obj.o'] + args + ['-s', 'WASM_OBJECT_FILES=1'])
      self.assertContained('hello, world!', run_js('a.out.js'))

  @parameterized({
    'except': [],
    'noexcept': ['-s', 'DISABLE_EXCEPTION_CATCHING=0']
  })
  @no_fastcomp('uses upstream specific option: WASM_OBJECT_FILES')
  def test_wasm_backend_lto_libcxx(self, *args):
    run_process([PYTHON, EMXX, path_from_root('tests', 'hello_libcxx.cpp')] + ['-s', 'WASM_OBJECT_FILES=0'] + list(args))

  @no_fastcomp('wasm backend lto specific')
  def test_lto_flags(self):
    for flags, expect_bitcode in [
      ([], False),
      (['-s', 'WASM_OBJECT_FILES=0'], True),
      (['-flto'], True),
    ]:
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp')] + flags + ['-c', '-o', 'a.o'])
      seen_bitcode = Building.is_bitcode('a.o')
      self.assertEqual(expect_bitcode, seen_bitcode, 'must emit LTO-capable bitcode when flags indicate so (%s)' % str(flags))

  def test_wasm_nope(self):
    for opts in [[], ['-O2']]:
      print(opts)
      # check we show a good error message if there is no wasm support
      create_test_file('pre.js', 'WebAssembly = undefined;\n')
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '--pre-js', 'pre.js'] + opts)
      out = run_js('a.out.js', stderr=STDOUT, assert_returncode=None)
      if opts == []:
        self.assertContained('No WebAssembly support found. Build with -s WASM=0 to target JavaScript instead.', out)
      else:
        self.assertContained('no native wasm support detected', out)

  def test_jsrun(self):
    print(NODE_JS)
    jsrun.WORKING_ENGINES = {}
    # Test that engine check passes
    self.assertTrue(jsrun.check_engine(NODE_JS))
    # Run it a second time (cache hit)
    self.assertTrue(jsrun.check_engine(NODE_JS))

    # Test that engine check fails
    bogus_engine = ['/fake/inline4']
    self.assertFalse(jsrun.check_engine(bogus_engine))
    self.assertFalse(jsrun.check_engine(bogus_engine))

    # Test the other possible way (list vs string) to express an engine
    if type(NODE_JS) is list:
      engine2 = NODE_JS[0]
    else:
      engine2 = [NODE_JS]
    self.assertTrue(jsrun.check_engine(engine2))

    # Test that run_js requires the engine
    jsrun.run_js(path_from_root('src', 'hello_world.js'), NODE_JS)
    caught_exit = 0
    try:
      jsrun.run_js(path_from_root('src', 'hello_world.js'), bogus_engine)
    except SystemExit as e:
      caught_exit = e.code
    self.assertEqual(1, caught_exit, 'Did not catch SystemExit with bogus JS engine')

  def test_error_on_missing_libraries(self):
    # -llsomenonexistingfile is an error by default
    err = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-lsomenonexistingfile'])
    if self.is_wasm_backend():
      self.assertContained('wasm-ld: error: unable to find library -lsomenonexistingfile', err)
    else:
      self.assertContained('emcc: cannot find library "somenonexistingfile"', err)

  # Tests that if user accidentally attempts to link native object code, we show an error
  def test_native_link_error_message(self):
    run_process([CLANG_CC, '-c', path_from_root('tests', 'hello_123.c'), '-o', 'hello_123.o'])
    err = self.expect_fail([PYTHON, EMCC, 'hello_123.o', '-o', 'hello_123.js'])
    self.assertContained('hello_123.o is not a valid input', err)

  # Tests that we should give a clear error on TOTAL_MEMORY not being enough for static initialization + stack
  def test_clear_error_on_massive_static_data(self):
    with open('src.cpp', 'w') as f:
      f.write('''
        char muchData[128 * 1024];
        int main() {
          return (int)&muchData;
        }
      ''')
    err = self.expect_fail([PYTHON, EMCC, 'src.cpp', '-s', 'TOTAL_STACK=1KB', '-s', 'TOTAL_MEMORY=64KB'])
    if self.is_wasm_backend():
      self.assertContained('wasm-ld: error: initial memory too small', err)
    else:
      self.assertContained('Memory is not large enough for static data (134016) plus the stack (1024), please increase TOTAL_MEMORY (65536)', err)

  def test_o_level_clamp(self):
    for level in [3, 4, 20]:
      err = run_process([PYTHON, EMCC, '-O' + str(level), path_from_root('tests', 'hello_world.c')], stderr=PIPE).stderr
      self.assertContainedIf("optimization level '-O" + str(level) + "' is not supported; using '-O3' instead", err, level > 3)

  # Tests that if user specifies multiple -o output directives, then the last one will take precedence
  def test_multiple_o_files(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'a.js', '-o', 'b.js'])
    assert os.path.isfile('b.js')
    assert not os.path.isfile('a.js')

  # Tests that Emscripten-provided header files can be cleanly included in C code
  def test_include_system_header_in_c(self):
    for std in [[], ['-std=c89']]: # Test oldest C standard, and the default C standard
      for directory, headers in [
        ('emscripten', ['dom_pk_codes.h', 'em_asm.h', 'emscripten.h', 'fetch.h', 'html5.h', 'key_codes.h', 'threading.h', 'trace.h', 'vector.h', 'vr.h']), # This directory has also bind.h, val.h and wire.h, which require C++11
        ('AL', ['al.h', 'alc.h']),
        ('EGL', ['egl.h', 'eglplatform.h']),
        ('GL', ['freeglut_std.h', 'gl.h', 'glew.h', 'glfw.h', 'glu.h', 'glut.h']),
        ('GLES', ['gl.h', 'glplatform.h']),
        ('GLES2', ['gl2.h', 'gl2platform.h']),
        ('GLES3', ['gl3.h', 'gl3platform.h', 'gl31.h', 'gl32.h']),
        ('GLFW', ['glfw3.h']),
        ('KHR', ['khrplatform.h'])]:
        for h in headers:
          inc = '#include <' + directory + '/' + h + '>'
          print(inc)
          create_test_file('a.c', inc)
          create_test_file('b.c', inc)
          run_process([PYTHON, EMCC] + std + ['a.c', 'b.c'])

  @is_slow_test
  def test_single_file(self):
    for (single_file_enabled,
         meminit1_enabled,
         debug_enabled,
         emterpreter_enabled,
         emterpreter_file_enabled,
         closure_enabled,
         wasm_enabled) in itertools.product([True, False], repeat=7):
      # skip unhelpful option combinations
      if emterpreter_file_enabled and not emterpreter_enabled:
        continue

      expect_wasm = wasm_enabled
      expect_emterpretify_file = emterpreter_file_enabled
      expect_meminit = meminit1_enabled and not wasm_enabled
      expect_success = not (emterpreter_file_enabled and single_file_enabled)
      expect_wast = debug_enabled and wasm_enabled and not self.is_wasm_backend()

      if self.is_wasm_backend() and emterpreter_enabled:
        continue

      # currently, the emterpreter always fails with JS output since we do not preload the emterpreter file, which in non-HTML we would need to do manually
      should_run_js = expect_success and not emterpreter_enabled

      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c')]

      if single_file_enabled:
        expect_emterpretify_file = False
        expect_meminit = False
        expect_wasm = False
        cmd += ['-s', 'SINGLE_FILE=1']
      if meminit1_enabled:
        cmd += ['--memory-init-file', '1']
      if debug_enabled:
        cmd += ['-g']
      if emterpreter_enabled:
        cmd += ['-s', 'EMTERPRETIFY=1']
      if emterpreter_file_enabled:
        cmd += ['-s', "EMTERPRETIFY_FILE='a.out.dat'"]
      if closure_enabled:
        cmd += ['--closure', '1']
      if not wasm_enabled:
        cmd += ['-s', 'WASM=0']

      print(' '.join(cmd))
      self.clear()
      if not expect_success:
        self.expect_fail(cmd)
        continue

      run_process(cmd)
      print(os.listdir('.'))
      assert expect_emterpretify_file == os.path.exists('a.out.dat')
      assert expect_meminit == (os.path.exists('a.out.mem') or os.path.exists('a.out.js.mem'))
      assert expect_wasm == os.path.exists('a.out.wasm')
      assert expect_wast == os.path.exists('a.out.wast')
      if should_run_js:
        self.assertContained('hello, world!', run_js('a.out.js'))

  def test_emar_M(self):
    create_test_file('file1', ' ')
    create_test_file('file2', ' ')
    run_process([PYTHON, EMAR, 'cr', 'file1.a', 'file1'])
    run_process([PYTHON, EMAR, 'cr', 'file2.a', 'file2'])
    run_process([PYTHON, EMAR, '-M'], input='''create combined.a
addlib file1.a
addlib file2.a
save
end
''')
    result = run_process([PYTHON, EMAR, 't', 'combined.a'], stdout=PIPE).stdout
    self.assertContained('file1', result)
    self.assertContained('file2', result)

  def test_flag_aliases(self):
    def assert_aliases_match(flag1, flag2, flagarg, extra_args):
      results = {}
      for f in (flag1, flag2):
        outfile = 'aliases.js'
        run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', f + '=' + flagarg, '-o', outfile] + extra_args)
        with open(outfile) as out:
          results[f] = out.read()
      self.assertEqual(results[flag1], results[flag2], 'results should be identical')

    assert_aliases_match('WASM_MEM_MAX', 'BINARYEN_MEM_MAX', '16777216', ['-s', 'WASM=1'])

  def test_IGNORE_CLOSURE_COMPILER_ERRORS(self):
    create_test_file('pre.js', r'''
      // make closure compiler very very angry
      var dupe = 1;
      var dupe = 2;
      function Node() {
        throw 'Node is a DOM thing too, and use the ' + dupe;
      }
      function Node() {
        throw '(duplicate) Node is a DOM thing too, and also use the ' + dupe;
      }
    ''')

    def test(check, extra=[]):
      cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O2', '--closure', '1', '--pre-js', 'pre.js'] + extra
      proc = run_process(cmd, check=check, stderr=PIPE)
      if not check:
        self.assertNotEqual(proc.returncode, 0)
      return proc

    WARNING = 'Variable dupe declared more than once'

    proc = test(check=False)
    self.assertContained(WARNING, proc.stderr)
    proc = test(check=True, extra=['-s', 'IGNORE_CLOSURE_COMPILER_ERRORS=1'])
    self.assertNotContained(WARNING, proc.stderr)

  def test_closure_full_js_library(self):
    # test for closure errors in the entire JS library
    # We must ignore various types of errors that are expected in this situation, as we
    # are including a lot of JS without corresponding compiled code for it. This still
    # lets us catch all other errors.
    with env_modify({'EMCC_CLOSURE_ARGS': '--jscomp_off undefinedVars'}):
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O2', '--closure', '1', '-g1', '-s', 'INCLUDE_FULL_LIBRARY=1', '-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0'])

  # Tests --closure-args command line flag
  def test_closure_externs(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '--closure', '1', '--pre-js', path_from_root('tests', 'test_closure_externs_pre_js.js'), '--closure-args', '--externs "' + path_from_root('tests', 'test_closure_externs.js') + '"'])

  def test_toolchain_profiler(self):
    environ = os.environ.copy()
    environ['EM_PROFILE_TOOLCHAIN'] = '1'
    # replaced subprocess functions should not cause errors
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')], env=environ)

  def test_noderawfs(self):
    fopen_write = open(path_from_root('tests', 'asmfs', 'fopen_write.cpp')).read()
    create_test_file('main.cpp', fopen_write)
    run_process([PYTHON, EMCC, 'main.cpp', '-s', 'NODERAWFS=1'])
    self.assertContained("read 11 bytes. Result: Hello data!", run_js('a.out.js'))

    # NODERAWFS should directly write on OS file system
    self.assertEqual("Hello data!", open('hello_file.txt').read())

  def test_noderawfs_disables_embedding(self):
    expected = '--preload-file and --embed-file cannot be used with NODERAWFS which disables virtual filesystem'
    base = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'NODERAWFS=1']
    err = self.expect_fail(base + ['--preload-files', 'somefile'])
    assert expected in err
    err = self.expect_fail(base + ['--embed-files', 'somefile'])
    assert expected in err

  def test_autotools_shared_check(self):
    env = os.environ.copy()
    env['LC_ALL'] = 'C'
    expected = ': supported targets:.* elf'
    for python in [PYTHON, 'python', 'python2', 'python3']:
      if not Building.which(python):
        continue
      if python == 'python3' and not is_python3_version_supported():
        continue
      print(python)
      out = run_process([python, EMCC, '--help'], stdout=PIPE, env=env).stdout
      assert re.search(expected, out)

  def test_ioctl_window_size(self):
      self.do_other_test(os.path.join('other', 'ioctl', 'window_size'))

  def test_fd_closed(self):
    self.do_other_test(os.path.join('other', 'fd_closed'))

  def test_fflush(self):
    # fflush without the full filesystem won't quite work
    self.do_other_test(os.path.join('other', 'fflush'))

  def test_fflush_fs(self):
    # fflush with the full filesystem will flush from libc, but not the JS logging, which awaits a newline
    self.do_other_test(os.path.join('other', 'fflush_fs'), emcc_args=['-s', 'FORCE_FILESYSTEM=1'])

  def test_fflush_fs_exit(self):
    # on exit, we can send out a newline as no more code will run
    self.do_other_test(os.path.join('other', 'fflush_fs_exit'), emcc_args=['-s', 'FORCE_FILESYSTEM=1', '-s', 'EXIT_RUNTIME=1'])

  def test_extern_weak(self):
    self.do_other_test(os.path.join('other', 'extern_weak'), emcc_args=['-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0'])
    if not self.is_wasm_backend(): # TODO: wasm backend main module
      self.do_other_test(os.path.join('other', 'extern_weak'), emcc_args=['-s', 'MAIN_MODULE=1', '-DLINKABLE'])

  def test_main_module_without_main(self):
    create_test_file('pre.js', r'''
var Module = {
  onRuntimeInitialized: function() {
    Module._foo();
  }
};
''')
    create_test_file('src.c', r'''
#include <emscripten.h>
EMSCRIPTEN_KEEPALIVE void foo() {
  EM_ASM({ console.log("bar") });
}
''')
    run_process([PYTHON, EMCC, 'src.c', '--pre-js', 'pre.js', '-s', 'MAIN_MODULE=2'])
    self.assertContained('bar', run_js('a.out.js'))

  def test_js_optimizer_parse_error(self):
    # check we show a proper understandable error for JS parse problems
    create_test_file('src.cpp', r'''
#include <emscripten.h>
int main() {
  EM_ASM({
    var x = !<->5.; // wtf
  });
}
''')
    stderr = self.expect_fail([PYTHON, EMCC, 'src.cpp', '-O2'])
    # wasm backend output doesn't have spaces in the EM_ASM function bodies
    self.assertContained(('''
var ASM_CONSTS = [function() { var x = !<->5.; }];
                                        ^
''', '''
var ASM_CONSTS = [function() {var x = !<->5.;}];
                                       ^
'''), stderr)

  def test_EM_ASM_ES6(self):
    # check we show a proper understandable error for JS parse problems
    create_test_file('src.cpp', r'''
#include <emscripten.h>
int main() {
  EM_ASM({
    var x = (a, b) => 5; // valid ES6!
    out('hello!');
  });
}
''')
    run_process([PYTHON, EMCC, 'src.cpp', '-O2'])
    self.assertContained('hello!', run_js('a.out.js'))

  def test_check_sourcemapurl(self):
    if not self.is_wasm():
      self.skipTest('only supported with wasm')
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_123.c'), '-g4', '-o', 'a.js', '--source-map-base', 'dir/'])
    output = open('a.wasm', 'rb').read()
    # has sourceMappingURL section content and points to 'dir/a.wasm.map' file
    source_mapping_url_content = encode_leb(len('sourceMappingURL')) + b'sourceMappingURL' + encode_leb(len('dir/a.wasm.map')) + b'dir/a.wasm.map'
    self.assertIn(source_mapping_url_content, output)

  @parameterized({
    'normal': [],
    'profiling': ['--profiling'] # -g4 --profiling should still emit a source map; see #8584
  })
  def test_check_sourcemapurl_default(self, *args):
    print(args)
    if not self.is_wasm():
      self.skipTest('only supported with wasm')

    try_delete('a.wasm.map')
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_123.c'), '-g4', '-o', 'a.js'] + list(args))
    output = open('a.wasm', 'rb').read()
    # has sourceMappingURL section content and points to 'a.wasm.map' file
    source_mapping_url_content = encode_leb(len('sourceMappingURL')) + b'sourceMappingURL' + encode_leb(len('a.wasm.map')) + b'a.wasm.map'
    self.assertIn(source_mapping_url_content, output)

  def test_wasm_sourcemap(self):
    # The no_main.c will be read (from relative location) due to speficied "-s"
    shutil.copyfile(path_from_root('tests', 'other', 'wasm_sourcemap', 'no_main.c'), 'no_main.c')
    wasm_map_cmd = [PYTHON, path_from_root('tools', 'wasm-sourcemap.py'),
                    '--sources', '--prefix', '=wasm-src://',
                    '--load-prefix', '/emscripten/tests/other/wasm_sourcemap=.',
                    '--dwarfdump-output',
                    path_from_root('tests', 'other', 'wasm_sourcemap', 'foo.wasm.dump'),
                    '-o', 'a.out.wasm.map',
                    path_from_root('tests', 'other', 'wasm_sourcemap', 'foo.wasm')]
    run_process(wasm_map_cmd)
    output = open('a.out.wasm.map').read()
    # has "sources" entry with file (includes also `--prefix =wasm-src:///` replacement)
    self.assertIn('wasm-src:///emscripten/tests/other/wasm_sourcemap/no_main.c', output)
    # has "sourcesContent" entry with source code (included with `-s` option)
    self.assertIn('int foo()', output)
    # has some entries
    self.assertRegexpMatches(output, r'"mappings":\s*"[A-Za-z0-9+/]')

  def test_wasm_sourcemap_dead(self):
    wasm_map_cmd = [PYTHON, path_from_root('tools', 'wasm-sourcemap.py'),
                    '--dwarfdump-output',
                    path_from_root('tests', 'other', 'wasm_sourcemap_dead', 't.wasm.dump'),
                    '-o', 'a.out.wasm.map',
                    path_from_root('tests', 'other', 'wasm_sourcemap_dead', 't.wasm')]
    run_process(wasm_map_cmd, stdout=PIPE, stderr=PIPE)
    output = open('a.out.wasm.map').read()
    # has only two entries
    self.assertRegexpMatches(output, r'"mappings":\s*"[A-Za-z0-9+/]+,[A-Za-z0-9+/]+"')

  def test_wasm_producers_section(self):
    # no producers section by default
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')])
    with open('a.out.wasm', 'rb') as f:
      self.assertNotIn('clang', str(f.read()))
    size = os.path.getsize('a.out.wasm')
    if self.is_wasm_backend():
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'EMIT_PRODUCERS_SECTION=1'])
      with open('a.out.wasm', 'rb') as f:
        self.assertIn('clang', str(f.read()))
      size_with_section = os.path.getsize('a.out.wasm')
      self.assertLess(size, size_with_section)

  def test_html_preprocess(self):
    test_file = path_from_root('tests', 'module', 'test_stdin.c')
    output_file = 'test_stdin.html'
    shell_file = path_from_root('tests', 'module', 'test_html_preprocess.html')

    run_process([PYTHON, EMCC, '-o', output_file, test_file, '--shell-file', shell_file, '-s', 'ASSERTIONS=0'], stdout=PIPE, stderr=PIPE)
    output = open(output_file).read()
    self.assertContained("""<style>
/* Disable preprocessing inside style block as syntax is ambiguous with CSS */
#include {background-color: black;}
#if { background-color: red;}
#else {background-color: blue;}
#endif {background-color: green;}
#xxx {background-color: purple;}
</style>
T1:(else) ASSERTIONS != 1
T2:ASSERTIONS != 1
T3:ASSERTIONS < 2
T4:(else) ASSERTIONS <= 1
T5:(else) ASSERTIONS
T6:!ASSERTIONS""", output)

    run_process([PYTHON, EMCC, '-o', output_file, test_file, '--shell-file', shell_file, '-s', 'ASSERTIONS=1'], stdout=PIPE, stderr=PIPE)
    output = open(output_file).read()
    self.assertContained("""<style>
/* Disable preprocessing inside style block as syntax is ambiguous with CSS */
#include {background-color: black;}
#if { background-color: red;}
#else {background-color: blue;}
#endif {background-color: green;}
#xxx {background-color: purple;}
</style>
T1:ASSERTIONS == 1
T2:(else) ASSERTIONS == 1
T3:ASSERTIONS < 2
T4:(else) ASSERTIONS <= 1
T5:ASSERTIONS
T6:(else) !ASSERTIONS""", output)

    run_process([PYTHON, EMCC, '-o', output_file, test_file, '--shell-file', shell_file, '-s', 'ASSERTIONS=2'], stdout=PIPE, stderr=PIPE)
    output = open(output_file).read()
    self.assertContained("""<style>
/* Disable preprocessing inside style block as syntax is ambiguous with CSS */
#include {background-color: black;}
#if { background-color: red;}
#else {background-color: blue;}
#endif {background-color: green;}
#xxx {background-color: purple;}
</style>
T1:(else) ASSERTIONS != 1
T2:ASSERTIONS != 1
T3:(else) ASSERTIONS >= 2
T4:ASSERTIONS > 1
T5:ASSERTIONS
T6:(else) !ASSERTIONS""", output)

  # Tests that Emscripten-compiled applications can be run from a relative path with node command line that is different than the current working directory.
  def test_node_js_run_from_different_directory(self):
    if not os.path.exists('subdir'):
      os.mkdir('subdir')
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', os.path.join('subdir', 'a.js'), '-O3'])
    ret = run_process(NODE_JS + [os.path.join('subdir', 'a.js')], stdout=PIPE).stdout
    self.assertContained('hello, world!', ret)

  def test_is_bitcode(self):
    fname = 'tmp.o'

    with open(fname, 'wb') as f:
      f.write(b'foo')
    self.assertFalse(Building.is_bitcode(fname))

    with open(fname, 'wb') as f:
      f.write(b'\xDE\xC0\x17\x0B')
      f.write(16 * b'\x00')
      f.write(b'BC')
    self.assertTrue(Building.is_bitcode(fname))

    with open(fname, 'wb') as f:
      f.write(b'BC')
    self.assertTrue(Building.is_bitcode(fname))

  def test_is_ar(self):
    fname = 'tmp.a'

    with open(fname, 'wb') as f:
      f.write(b'foo')
    self.assertFalse(Building.is_ar(fname))

    with open(fname, 'wb') as f:
      f.write(b'!<arch>\n')
    self.assertTrue(Building.is_ar(fname))

  def test_emcc_parsing(self):
    create_test_file('src.c', r'''
        #include <stdio.h>
        void a() { printf("a\n"); }
        void b() { printf("b\n"); }
        void c() { printf("c\n"); }
        void d() { printf("d\n"); }
      ''')
    create_test_file('response', r'''[
"_a",
"_b",
"_c",
"_d"
]
''')

    for export_arg, expected in [
      # extra space at end - should be ignored
      ("EXPORTED_FUNCTIONS=['_a', '_b', '_c', '_d' ]", ''),
      # extra newline in response file - should be ignored
      ("EXPORTED_FUNCTIONS=@response", ''),
      # stray slash
      ("EXPORTED_FUNCTIONS=['_a', '_b', \\'_c', '_d']", '''undefined exported function: "\\\\'_c'"'''),
      # stray slash
      ("EXPORTED_FUNCTIONS=['_a', '_b',\\ '_c', '_d']", '''undefined exported function: "\\\\ '_c'"'''),
      # stray slash
      ('EXPORTED_FUNCTIONS=["_a", "_b", \\"_c", "_d"]', 'undefined exported function: "\\\\"_c""'),
      # stray slash
      ('EXPORTED_FUNCTIONS=["_a", "_b",\\ "_c", "_d"]', 'undefined exported function: "\\\\ "_c"'),
      # missing comma
      ('EXPORTED_FUNCTIONS=["_a", "_b" "_c", "_d"]', 'undefined exported function: "_b" "_c"'),
    ]:
      print(export_arg)
      proc = run_process([PYTHON, EMCC, 'src.c', '-s', export_arg], stdout=PIPE, stderr=PIPE, check=not expected)
      print(proc.stderr)
      if not expected:
        assert not proc.stderr
      else:
        self.assertNotEqual(proc.returncode, 0)
        self.assertContained(expected, proc.stderr)

  @no_fastcomp('uses new ASYNCIFY')
  def test_asyncify_escaping(self):
    proc = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'ASYNCIFY=1', '-s', "ASYNCIFY_WHITELIST=[DOS_ReadFile(unsigned short, unsigned char*, unsigned short*, bool)]"], stdout=PIPE, stderr=PIPE)
    self.assertContained('emcc: ASYNCIFY list contains an item without balanced parentheses', proc.stderr)
    self.assertContained('   DOS_ReadFile(unsigned short', proc.stderr)
    self.assertContained('Try to quote the entire argument', proc.stderr)

  @no_fastcomp('uses new ASYNCIFY')
  def test_asyncify_response_file(self):
    return self.skipTest(' TODO remove the support for multiple binaryen versions warning output ("function name" vs "pattern" etc).')
    create_test_file('a.txt', r'''[
  "DOS_ReadFile(unsigned short, unsigned char*, unsigned short*, bool)"
]
''')
    proc = run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'ASYNCIFY=1', '-s', "ASYNCIFY_WHITELIST=@a.txt"], stdout=PIPE, stderr=PIPE)
    # we should parse the response file properly, and then issue a proper warning for the missing function
    self.assertContained(
        'Asyncify whitelist contained a non-matching pattern: DOS_ReadFile(unsigned short, unsigned char*, unsigned short*, bool)',
        proc.stderr)

  # Sockets and networking

  def test_inet(self):
    self.do_run(open(path_from_root('tests', 'sha1.c')).read(), 'SHA1=15dd99a1991e0b3826fede3deffc1feba42278e6')
    src = r'''
      #include <stdio.h>
      #include <arpa/inet.h>

      int main() {
        printf("*%x,%x,%x,%x,%x,%x*\n", htonl(0xa1b2c3d4), htonl(0xfe3572e0), htonl(0x07abcdf0), htons(0xabcd), ntohl(0x43211234), ntohs(0xbeaf));
        in_addr_t i = inet_addr("190.180.10.78");
        printf("%x\n", i);
        return 0;
      }
    '''
    self.do_run(src, '*d4c3b2a1,e07235fe,f0cdab07,cdab,34122143,afbe*\n4e0ab4be\n')

  def test_inet2(self):
    src = r'''
      #include <stdio.h>
      #include <arpa/inet.h>

      int main() {
        struct in_addr x, x2;
        int *y = (int*)&x;
        *y = 0x12345678;
        printf("%s\n", inet_ntoa(x));
        int r = inet_aton(inet_ntoa(x), &x2);
        printf("%s\n", inet_ntoa(x2));
        return 0;
      }
    '''
    self.do_run(src, '120.86.52.18\n120.86.52.18\n')

  def test_inet3(self):
    src = r'''
      #include <stdio.h>
      #include <arpa/inet.h>
      #include <sys/socket.h>
      int main() {
        char dst[64];
        struct in_addr x, x2;
        int *y = (int*)&x;
        *y = 0x12345678;
        printf("%s\n", inet_ntop(AF_INET,&x,dst,sizeof dst));
        int r = inet_aton(inet_ntoa(x), &x2);
        printf("%s\n", inet_ntop(AF_INET,&x2,dst,sizeof dst));
        return 0;
      }
    '''
    self.do_run(src, '120.86.52.18\n120.86.52.18\n')

  def test_inet4(self):
    src = r'''
      #include <stdio.h>
      #include <arpa/inet.h>
      #include <sys/socket.h>

      void test(const char *test_addr, bool first=true){
          char str[40];
          struct in6_addr addr;
          unsigned char *p = (unsigned char*)&addr;
          int ret;
          ret = inet_pton(AF_INET6,test_addr,&addr);
          if(ret == -1) return;
          if(ret == 0) return;
          if(inet_ntop(AF_INET6,&addr,str,sizeof(str)) == NULL ) return;
          printf("%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x - %s\n",
               p[0],p[1],p[2],p[3],p[4],p[5],p[6],p[7],p[8],p[9],p[10],p[11],p[12],p[13],p[14],p[15],str);
          if (first) test(str, false); // check again, on our output
      }
      int main(){
          test("::");
          test("::1");
          test("::1.2.3.4");
          test("::17.18.19.20");
          test("::ffff:1.2.3.4");
          test("1::ffff");
          test("::255.255.255.255");
          test("0:ff00:1::");
          test("0:ff::");
          test("abcd::");
          test("ffff::a");
          test("ffff::a:b");
          test("ffff::a:b:c");
          test("ffff::a:b:c:d");
          test("ffff::a:b:c:d:e");
          test("::1:2:0:0:0");
          test("0:0:1:2:3::");
          test("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
          test("1::255.255.255.255");

          //below should fail and not produce results..
          test("1.2.3.4");
          test("");
          test("-");

          printf("ok.\n");
      }
    '''
    self.do_run(src, r'''0000:0000:0000:0000:0000:0000:0000:0000 - ::
0000:0000:0000:0000:0000:0000:0000:0000 - ::
0000:0000:0000:0000:0000:0000:0000:0001 - ::1
0000:0000:0000:0000:0000:0000:0000:0001 - ::1
0000:0000:0000:0000:0000:0000:0102:0304 - ::102:304
0000:0000:0000:0000:0000:0000:0102:0304 - ::102:304
0000:0000:0000:0000:0000:0000:1112:1314 - ::1112:1314
0000:0000:0000:0000:0000:0000:1112:1314 - ::1112:1314
0000:0000:0000:0000:0000:ffff:0102:0304 - ::ffff:1.2.3.4
0000:0000:0000:0000:0000:ffff:0102:0304 - ::ffff:1.2.3.4
0001:0000:0000:0000:0000:0000:0000:ffff - 1::ffff
0001:0000:0000:0000:0000:0000:0000:ffff - 1::ffff
0000:0000:0000:0000:0000:0000:ffff:ffff - ::ffff:ffff
0000:0000:0000:0000:0000:0000:ffff:ffff - ::ffff:ffff
0000:ff00:0001:0000:0000:0000:0000:0000 - 0:ff00:1::
0000:ff00:0001:0000:0000:0000:0000:0000 - 0:ff00:1::
0000:00ff:0000:0000:0000:0000:0000:0000 - 0:ff::
0000:00ff:0000:0000:0000:0000:0000:0000 - 0:ff::
abcd:0000:0000:0000:0000:0000:0000:0000 - abcd::
abcd:0000:0000:0000:0000:0000:0000:0000 - abcd::
ffff:0000:0000:0000:0000:0000:0000:000a - ffff::a
ffff:0000:0000:0000:0000:0000:0000:000a - ffff::a
ffff:0000:0000:0000:0000:0000:000a:000b - ffff::a:b
ffff:0000:0000:0000:0000:0000:000a:000b - ffff::a:b
ffff:0000:0000:0000:0000:000a:000b:000c - ffff::a:b:c
ffff:0000:0000:0000:0000:000a:000b:000c - ffff::a:b:c
ffff:0000:0000:0000:000a:000b:000c:000d - ffff::a:b:c:d
ffff:0000:0000:0000:000a:000b:000c:000d - ffff::a:b:c:d
ffff:0000:0000:000a:000b:000c:000d:000e - ffff::a:b:c:d:e
ffff:0000:0000:000a:000b:000c:000d:000e - ffff::a:b:c:d:e
0000:0000:0000:0001:0002:0000:0000:0000 - ::1:2:0:0:0
0000:0000:0000:0001:0002:0000:0000:0000 - ::1:2:0:0:0
0000:0000:0001:0002:0003:0000:0000:0000 - 0:0:1:2:3::
0000:0000:0001:0002:0003:0000:0000:0000 - 0:0:1:2:3::
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
0001:0000:0000:0000:0000:0000:ffff:ffff - 1::ffff:ffff
0001:0000:0000:0000:0000:0000:ffff:ffff - 1::ffff:ffff
ok.
''')

  def test_getsockname_unconnected_socket(self):
    self.do_run(r'''
      #include <sys/socket.h>
      #include <stdio.h>
      #include <assert.h>
      #include <sys/socket.h>
      #include <netinet/in.h>
      #include <arpa/inet.h>
      #include <string.h>
      int main() {
        int fd;
        int z;
        fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        struct sockaddr_in adr_inet;
        socklen_t len_inet = sizeof adr_inet;
        z = getsockname(fd, (struct sockaddr *)&adr_inet, &len_inet);
        if (z != 0) {
          perror("getsockname error");
          return 1;
        }
        char buffer[1000];
        sprintf(buffer, "%s:%u", inet_ntoa(adr_inet.sin_addr), (unsigned)ntohs(adr_inet.sin_port));
        const char *correct = "0.0.0.0:0";
        printf("got (expected) socket: %s (%s), size %d (%d)\n", buffer, correct, strlen(buffer), strlen(correct));
        assert(strlen(buffer) == strlen(correct));
        assert(strcmp(buffer, correct) == 0);
        puts("success.");
      }
    ''', 'success.')

  def test_getpeername_unconnected_socket(self):
    self.do_run(r'''
      #include <sys/socket.h>
      #include <stdio.h>
      #include <assert.h>
      #include <sys/socket.h>
      #include <netinet/in.h>
      #include <arpa/inet.h>
      #include <string.h>
      int main() {
        int fd;
        int z;
        fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        struct sockaddr_in adr_inet;
        socklen_t len_inet = sizeof adr_inet;
        z = getpeername(fd, (struct sockaddr *)&adr_inet, &len_inet);
        if (z != 0) {
          perror("getpeername error");
          return 1;
        }
        puts("unexpected success.");
      }
    ''', 'getpeername error: Socket not connected', assert_returncode=None)

  def test_getaddrinfo(self):
    self.do_run(open(path_from_root('tests', 'sockets', 'test_getaddrinfo.c')).read(), 'success')

  def test_getnameinfo(self):
    self.do_run(open(path_from_root('tests', 'sockets', 'test_getnameinfo.c')).read(), 'success')

  def test_gethostbyname(self):
    self.do_run(open(path_from_root('tests', 'sockets', 'test_gethostbyname.c')).read(), 'success')

  def test_getprotobyname(self):
    self.do_run(open(path_from_root('tests', 'sockets', 'test_getprotobyname.c')).read(), 'success')

  def test_link(self):
    self.do_run(r'''
#include <netdb.h>

#include <sys/types.h>
#include <sys/socket.h>

int main () {
    void* thing = gethostbyname("bing.com");
    ssize_t rval = recv (0, thing, 0, 0);
    rval = send (0, thing, 0, 0);
    return 0;
}''', '', force_c=True)

  # This test verifies that function names embedded into the build with --js-library (JS functions imported to asm.js/wasm)
  # are minified when -O3 is used
  def test_js_function_names_are_minified(self):
    def check_size(f, expected_size):
      if not os.path.isfile(f):
        return # Nonexistent file passes in this check
      obtained_size = os.path.getsize(f)
      print('size of generated ' + f + ': ' + str(obtained_size))
      try_delete(f)
      assert obtained_size < expected_size

    run_process([PYTHON, path_from_root('tests', 'gen_many_js_functions.py'), 'library_long.js', 'main_long.c'])
    for wasm in [['-s', 'WASM=1'], ['-s', 'WASM=0']]:
      if self.is_wasm_backend() and 'WASM=0' in wasm:
        continue
      # Currently we rely on Closure for full minification of every appearance of JS function names.
      # TODO: Add minification also for non-Closure users and add [] to this list to test minification without Closure.
      for closure in [['--closure', '1']]:
        args = [PYTHON, EMCC, '-O3', '--js-library', 'library_long.js', 'main_long.c', '-o', 'a.html'] + wasm + closure
        print(' '.join(args))
        run_process(args)

        ret = run_process(NODE_JS + ['a.js'], stdout=PIPE).stdout
        self.assertTextDataIdentical('Sum of numbers from 1 to 1000: 500500 (expected 500500)', ret.strip())

        check_size('a.js', 150000)
        check_size('a.wasm', 80000)

  # Checks that C++ exceptions managing invoke_*() wrappers will not be generated if exceptions are disabled
  def test_no_invoke_functions_are_generated_if_exception_catching_is_disabled(self):
    self.skipTest('Skipping other.test_no_invoke_functions_are_generated_if_exception_catching_is_disabled: Enable after new version of fastcomp has been tagged')
    for args in [[], ['-s', 'WASM=0']]:
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'DISABLE_EXCEPTION_CATCHING=1', '-o', 'a.html'] + args)
      output = open('a.js').read()
      self.assertContained('_main', output) # Smoke test that we actually compiled
      self.assertNotContained('invoke_', output)

  # Verifies that only the minimal needed set of invoke_*() functions will be generated when C++ exceptions are enabled
  def test_no_excessive_invoke_functions_are_generated_when_exceptions_are_enabled(self):
    self.skipTest('Skipping other.test_no_excessive_invoke_functions_are_generated_when_exceptions_are_enabled: Enable after new version of fastcomp has been tagged')
    for args in [[], ['-s', 'WASM=0']]:
      run_process([PYTHON, EMCC, path_from_root('tests', 'invoke_i.cpp'), '-s', 'DISABLE_EXCEPTION_CATCHING=0', '-o', 'a.html'] + args)
      output = open('a.js').read()
      self.assertContained('invoke_i', output)
      self.assertNotContained('invoke_ii', output)
      self.assertNotContained('invoke_v', output)

  def test_add_emscripten_metadata(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'),
                 '-s', 'EMIT_EMSCRIPTEN_METADATA',
                 '-o', 'hello_world.js'])
    wasm = open('hello_world.wasm', 'rb').read()
    # emscripten_metadata should be in the wasm data
    offset = 8 # skip magic + header
    for _ in range(100):
      section = wasm[offset:offset + 1]
      self.assertEqual(section, b'\0', 'No emscripten_metadata section found before standard wasm sections')
      offset += 1
      (section_size, offset) = WebAssembly.delebify(wasm, offset)
      end_offset = offset + section_size
      (name_len, offset) = WebAssembly.delebify(wasm, offset)
      name = wasm[offset:offset + name_len]
      if name == b'emscripten_metadata':
        break
      offset = end_offset
    else:
      self.assertFalse("No emscripten_metadata section found in first 100 custom sections")

    # make sure wasm executes correctly
    ret = run_process(NODE_JS + ['hello_world.js'], stdout=PIPE).stdout
    self.assertTextDataIdentical('hello, world!\n', ret)

  def test_add_emscripten_metadata_not_emitted(self):
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'),
                 '-o', 'hello_world.js'])
    wasm = open('hello_world.wasm', 'rb').read()
    # emscripten_metadata should be in the wasm data
    offset = 8 # skip magic + header
    for _ in range(100):
      if offset >= len(wasm):
        break
      section = wasm[offset:offset + 1]
      offset += 1
      (section_size, offset) = WebAssembly.delebify(wasm, offset)
      end_offset = offset + section_size
      # if this is a custom section
      if section == b'\0':
        (name_len, offset) = WebAssembly.delebify(wasm, offset)
        name = wasm[offset:offset + name_len]
        self.assertNotEqual(name, b'emscripten_metadata')
      offset = end_offset
    else:
      self.assertFalse("wasm file had too many sections")

  # This test verifies that the generated exports from asm.js/wasm module only reference the unminified exported name exactly once.
  # (need to contain the export name once for unminified access from calling code, and should not have the unminified name exist more than once, that would be wasteful for size)
  def test_function_exports_are_small(self):
    def test(wasm, closure, opt):
      args = [PYTHON, EMCC, path_from_root('tests', 'long_function_name_in_export.c'), '-o', 'a.html', '-s', 'ENVIRONMENT=web', '-s', 'DECLARE_ASM_MODULE_EXPORTS=0'] + wasm + opt + closure
      run_process(args)

      output = open('a.js', 'r').read()
      try_delete('a.js')
      self.assertNotContained('asm["_thisIsAFunctionExportedFromAsmJsOrWasmWithVeryLongFunctionNameThatWouldBeGreatToOnlyHaveThisLongNameReferredAtMostOnceInOutput"]', output)

      # TODO: Add stricter testing when Wasm side is also optimized: (currently Wasm does still need to reference exports multiple times)
      if 'WASM=1' not in wasm:
        num_times_export_is_referenced = output.count('thisIsAFunctionExportedFromAsmJsOrWasmWithVeryLongFunctionNameThatWouldBeGreatToOnlyHaveThisLongNameReferredAtMostOnceInOutput')
        self.assertEqual(num_times_export_is_referenced, 1)

    if not self.is_wasm_backend():
      for closure in [[], ['--closure', '1']]:
        for opt in [['-O2'], ['-O3'], ['-Os']]:
          test(['-s', 'WASM=0'], closure, opt)
          test(['-s', 'WASM=1', '-s', 'WASM_ASYNC_COMPILATION=0'], closure, opt)

  @no_wasm_backend('tests asmjs, sizes sensitive to fastcomp')
  def test_minimal_runtime_code_size(self):
    smallest_code_size_args = ['-s', 'MINIMAL_RUNTIME=2',
                               '-s', 'AGGRESSIVE_VARIABLE_ELIMINATION=1',
                               '-s', 'ENVIRONMENT=web',
                               '-s', 'TEXTDECODER=2',
                               '-s', 'ABORTING_MALLOC=0',
                               '-s', 'ALLOW_MEMORY_GROWTH=0',
                               '-s', 'SUPPORT_ERRNO=0',
                               '-s', 'DECLARE_ASM_MODULE_EXPORTS=1',
                               '-s', 'MALLOC=emmalloc',
                               '-s', 'GL_EMULATE_GLES_VERSION_STRING_FORMAT=0',
                               '-s', 'GL_EXTENSIONS_IN_PREFIXED_FORMAT=0',
                               '-s', 'GL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS=0',
                               '-s', 'GL_TRACK_ERRORS=0',
                               '-s', 'GL_SUPPORT_EXPLICIT_SWAP_CONTROL=0',
                               '-s', 'GL_POOL_TEMP_BUFFERS=0',
                               '-s', 'FAST_UNROLLED_MEMCPY_AND_MEMSET=0',
                               '--output_eol', 'linux']

    asmjs = ['-s', 'WASM=0', '--separate-asm', '-s', 'ELIMINATE_DUPLICATE_FUNCTIONS=1', '--memory-init-file', '1']
    opts = ['-O3', '--closure', '1', '-DNDEBUG', '-ffast-math']

    hello_world_sources = [path_from_root('tests', 'small_hello_world.c'),
                           '-s', 'RUNTIME_FUNCS_TO_IMPORT=[]',
                           '-s', 'USES_DYNAMIC_ALLOC=0',
                           '-s', 'ASM_PRIMITIVE_VARS=[STACKTOP]']
    hello_webgl_sources = [path_from_root('tests', 'minimal_webgl', 'main.cpp'),
                           path_from_root('tests', 'minimal_webgl', 'webgl.c'),
                           '--js-library', path_from_root('tests', 'minimal_webgl', 'library_js.js'),
                           '-s', 'RUNTIME_FUNCS_TO_IMPORT=[]',
                           '-s', 'USES_DYNAMIC_ALLOC=2', '-lGL',
                           '-s', 'MODULARIZE=1']
    hello_webgl2_sources = hello_webgl_sources + ['-s', 'USE_WEBGL2=1']

    test_cases = [
      (asmjs + opts, hello_world_sources, {'a.html': 981, 'a.js': 289, 'a.asm.js': 113, 'a.mem': 6}),
      (opts, hello_world_sources, {'a.html': 968, 'a.js': 604, 'a.wasm': 86}),
      (asmjs + opts, hello_webgl_sources, {'a.html': 881, 'a.js': 5035, 'a.asm.js': 11094, 'a.mem': 321}),
      (opts, hello_webgl_sources, {'a.html': 857, 'a.js': 5083, 'a.wasm': 8841}),
      (opts, hello_webgl2_sources, {'a.html': 857, 'a.js': 6192, 'a.wasm': 8841}) # Compare how WebGL2 sizes stack up with WebGL 1
    ]

    success = True

    def print_percent(actual, expected):
      if actual == expected:
        return ''
      return ' ({:+.2f}%)'.format((actual - expected) * 100.0 / expected)

    for case in test_cases:
      print('\n-----------------------------\n' + str(case))
      flags, sources, files = case
      args = [PYTHON, EMCC, '-o', 'a.html'] + sources + smallest_code_size_args + flags
      print('\n' + ' '.join(args))
      run_process(args)
      print('\n')

      total_output_size = 0
      total_expected_size = 0
      for f in files:
        expected_size = files[f]
        size = os.path.getsize(f)
        print('size of ' + f + ' == ' + str(size) + ', expected ' + str(expected_size) + ', delta=' + str(size - expected_size) + print_percent(size, expected_size))

        # Hack: Generated .mem initializer files have different sizes on different
        # platforms (Windows gives x, CircleCI Linux gives x-17 bytes, my home
        # Linux gives x+2 bytes..). Likewise asm.js files seem to be affected by
        # the LLVM IR text names, which lead to asm.js names, which leads to
        # difference code size, which leads to different relooper choices,
        # as a result leading to slightly different total code sizes.
        # TODO: identify what is causing this. meanwhile allow some amount of slop
        mem_slop = 20
        if size <= expected_size + mem_slop and size >= expected_size - mem_slop:
          size = expected_size

        total_output_size += size
        total_expected_size += expected_size

      print('Total output size=' + str(total_output_size) + ' bytes, expected total size=' + str(total_expected_size) + ', delta=' + str(total_output_size - total_expected_size) + print_percent(total_output_size, total_expected_size))
      if total_output_size > total_expected_size:
        print('Oops, overall generated code size regressed by ' + str(total_output_size - total_expected_size) + ' bytes!')
      if total_output_size < total_expected_size:
        print('Hey amazing, overall generated code size was improved by ' + str(total_expected_size - total_output_size) + ' bytes! Please update test other.test_minimal_runtime_code_size with the new updated size!')
      if total_output_size != total_expected_size:
        success = False
    assert success

  # Test that legacy settings that have been fixed to a specific value and their value can no longer be changed,
  def test_legacy_settings_forbidden_to_change(self):
    stderr = self.expect_fail([PYTHON, EMCC, '-s', 'MEMFS_APPEND_TO_TYPED_ARRAYS=0', path_from_root('tests', 'hello_world.c')])
    self.assertContained('MEMFS_APPEND_TO_TYPED_ARRAYS=0 is no longer supported', stderr)

    run_process([PYTHON, EMCC, '-s', 'MEMFS_APPEND_TO_TYPED_ARRAYS=1', path_from_root('tests', 'hello_world.c')])
    run_process([PYTHON, EMCC, '-s', 'PRECISE_I64_MATH=2', path_from_root('tests', 'hello_world.c')])

  def test_strict_mode_hello_world(self):
    # Verify that strict mode can be used for simple hello world program both
    # via the environment EMCC_STRICT=1 and from the command line `-s STRICT`
    cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'STRICT=1']
    run_process(cmd)
    with env_modify({'EMCC_STRICT': '1'}):
      self.do_run(open(path_from_root('tests', 'hello_world.c')).read(), 'hello, world!')

  def test_strict_mode_legacy_settings(self):
    cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'SPLIT_MEMORY=0']
    run_process(cmd)

    stderr = self.expect_fail(cmd + ['-s', 'STRICT=1'])
    self.assertContained('legacy setting used in strict mode: SPLIT_MEMORY', stderr)

    with env_modify({'EMCC_STRICT': '1'}):
      stderr = self.expect_fail(cmd)
      self.assertContained('legacy setting used in strict mode: SPLIT_MEMORY', stderr)

  def test_strict_mode_legacy_settings_runtime(self):
    # Verify that legacy settings are not accessible at runtime under strict
    # mode.
    self.set_setting('RETAIN_COMPILER_SETTINGS', 1)
    src = r'''\
    #include <stdio.h>
    #include <emscripten.h>

    int main() {
      printf("BINARYEN_METHOD: %s\n", (char*)emscripten_get_compiler_setting("BINARYEN_METHOD"));
      return 0;
    }
    '''
    self.do_run(src, 'BINARYEN_METHOD: native-wasm')
    with env_modify({'EMCC_STRICT': '1'}):
      self.do_run(src, 'invalid compiler setting: BINARYEN_METHOD')
    self.set_setting('STRICT', 1)
    self.do_run(src, 'invalid compiler setting: BINARYEN_METHOD')

  def test_strict_mode_renamed_setting(self):
    # Verify that renamed settings are available by either name (when not in
    # strict mode.
    self.set_setting('RETAIN_COMPILER_SETTINGS', 1)
    src = r'''\
    #include <stdio.h>
    #include <emscripten.h>

    int main() {
      printf("%d %d\n",
        emscripten_get_compiler_setting("BINARYEN_ASYNC_COMPILATION"),
        emscripten_get_compiler_setting("WASM_ASYNC_COMPILATION"));
      return 0;
    }
    '''

    # Setting the new name should set both
    self.set_setting('WASM_ASYNC_COMPILATION', 0)
    self.do_run(src, '0 0')
    self.set_setting('WASM_ASYNC_COMPILATION', 1)
    self.do_run(src, '1 1')
    self.clear_setting('WASM_ASYNC_COMPILATION')

    # Setting the old name should set both
    self.set_setting('BINARYEN_ASYNC_COMPILATION', 0)
    self.do_run(src, '0 0')
    self.set_setting('BINARYEN_ASYNC_COMPILATION', 1)
    self.do_run(src, '1 1')

  def test_strict_mode_legacy_settings_library(self):
    create_test_file('lib.js', r'''
#if SPLIT_MEMORY
#endif
''')
    cmd = [PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-o', 'out.js', '--js-library', 'lib.js']
    run_process(cmd)
    self.assertContained('ReferenceError: SPLIT_MEMORY is not defined', self.expect_fail(cmd + ['-s', 'STRICT=1']))
    with env_modify({'EMCC_STRICT': '1'}):
      self.assertContained('ReferenceError: SPLIT_MEMORY is not defined', self.expect_fail(cmd))

  def test_safe_heap_log(self):
    self.set_setting('SAFE_HEAP')
    self.set_setting('SAFE_HEAP_LOG')
    self.set_setting('EXIT_RUNTIME')
    src = open(path_from_root('tests', 'hello_world.c')).read()
    self.do_run(src, 'SAFE_HEAP load: ')

    if not self.is_wasm_backend():
      self.set_setting('WASM', 0)
      self.do_run(src, 'SAFE_HEAP load: ')

  @no_fastcomp('iprintf/__small_printf are wasm-backend-only features')
  def test_mini_printfs(self):
    def test(code):
      with open('src.c', 'w') as f:
        f.write('''
          #include <stdio.h>
          int main() {
            volatile void* unknown_value;
            %s
          }
        ''' % code)
      run_process([PYTHON, EMCC, 'src.c', '-O1'])
      return os.path.getsize('a.out.wasm')

    i = test('printf("%d", *(int*)unknown_value);')
    f = test('printf("%f", *(double*)unknown_value);')
    lf = test('printf("%Lf", *(long double*)unknown_value);')
    both = test('printf("%d", *(int*)unknown_value); printf("%Lf", *(long double*)unknown_value);')
    print(i, f, lf, both)

    # iprintf is much smaller than printf with float support
    assert f - 3400 <= i <= f - 3000
    # __small_printf is somewhat smaller than printf with long double support
    assert lf - 900 <= f <= lf - 500
    # both is a little bigger still
    assert both - 100 <= lf <= both - 50

  # Tests that passing -s MALLOC=none will not include system malloc() to the build.
  def test_malloc_none(self):
    stderr = self.expect_fail([PYTHON, EMCC, path_from_root('tests', 'malloc_none.c'), '-s', 'MALLOC=none'])
    self.assertContained('undefined symbol: malloc', stderr)

  @parameterized({
    'c': ['c'],
    'cpp': ['cpp'],
  })
  @no_fastcomp('lsan not supported on fastcomp')
  def test_lsan_leaks(self, ext):
    self.do_smart_test(path_from_root('tests', 'other', 'test_lsan_leaks.' + ext),
                       emcc_args=['-fsanitize=leak', '-s', 'ALLOW_MEMORY_GROWTH=1'],
                       assert_returncode=None, literals=[
      'Direct leak of 2048 byte(s) in 1 object(s) allocated from',
      'Direct leak of 1337 byte(s) in 1 object(s) allocated from',
      'Direct leak of 42 byte(s) in 1 object(s) allocated from',
    ])

  @parameterized({
    'c': ['c', [
      r'in malloc.*a\.out\.wasm\+0x',
      r'(?im)in f (/|[a-z]:).*/test_lsan_leaks\.c:6:21$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.c:10:16$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.c:12:3$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.c:13:3$',
    ]],
    'cpp': ['cpp', [
      r'in operator new\[\]\(unsigned long\).*a\.out\.wasm\+0x',
      r'(?im)in f\(\) (/|[a-z]:).*/test_lsan_leaks\.cpp:4:21$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.cpp:8:16$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.cpp:10:3$',
      r'(?im)in main (/|[a-z]:).*/test_lsan_leaks\.cpp:11:3$',
    ]],
  })
  @no_fastcomp('lsan not supported on fastcomp')
  def test_lsan_stack_trace(self, ext, regexes):
    self.do_smart_test(path_from_root('tests', 'other', 'test_lsan_leaks.' + ext),
                       emcc_args=['-fsanitize=leak', '-s', 'ALLOW_MEMORY_GROWTH=1', '-g4'],
                       assert_returncode=None, literals=[
      'Direct leak of 2048 byte(s) in 1 object(s) allocated from',
      'Direct leak of 1337 byte(s) in 1 object(s) allocated from',
      'Direct leak of 42 byte(s) in 1 object(s) allocated from',
    ], regexes=regexes)

  @parameterized({
    'c': ['c'],
    'cpp': ['cpp'],
  })
  @no_fastcomp('lsan not supported on fastcomp')
  def test_lsan_no_leak(self, ext):
    self.do_smart_test(path_from_root('tests', 'other', 'test_lsan_no_leak.' + ext),
                       emcc_args=['-fsanitize=leak', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'ASSERTIONS=0'],
                       regexes=[r'^\s*$'])

  @no_fastcomp('lsan not supported on fastcomp')
  def test_lsan_no_stack_trace(self):
    self.do_smart_test(path_from_root('tests', 'other', 'test_lsan_leaks.c'),
                       emcc_args=['-fsanitize=leak', '-s', 'ALLOW_MEMORY_GROWTH=1', '-DDISABLE_CONTEXT'],
                       assert_returncode=None, literals=[
      'Direct leak of 3427 byte(s) in 3 object(s) allocated from:',
      'SUMMARY: LeakSanitizer: 3427 byte(s) leaked in 3 allocation(s).',
    ])

  @no_fastcomp('asan is not supported on fastcomp')
  def test_asan_null_deref(self):
    self.do_smart_test(path_from_root('tests', 'other', 'test_asan_null_deref.c'),
                       emcc_args=['-fsanitize=address', '-s', 'ALLOW_MEMORY_GROWTH=1'],
                       assert_returncode=None, literals=[
      'AddressSanitizer: null-pointer-dereference on address',
    ])

  @no_fastcomp('asan is not supported on fastcomp')
  def test_asan_no_stack_trace(self):
    self.do_smart_test(path_from_root('tests', 'other', 'test_lsan_leaks.c'),
                       emcc_args=['-fsanitize=address', '-s', 'ALLOW_MEMORY_GROWTH=1', '-DDISABLE_CONTEXT', '-s', 'EXIT_RUNTIME'],
                       assert_returncode=None, literals=[
      'Direct leak of 3427 byte(s) in 3 object(s) allocated from:',
      'SUMMARY: AddressSanitizer: 3427 byte(s) leaked in 3 allocation(s).',
    ])

  @parameterized({
    'async': ['-s', 'WASM_ASYNC_COMPILATION=1'],
    'sync': ['-s', 'WASM_ASYNC_COMPILATION=0'],
  })
  @no_fastcomp('offset converter is not supported on fastcomp')
  def test_offset_converter(self, *args):
    self.do_smart_test(path_from_root('tests', 'other', 'test_offset_converter.c'),
                       emcc_args=['-s', 'USE_OFFSET_CONVERTER', '-g4'] + list(args), literals=['ok'])

  @no_windows('ptys and select are not available on windows')
  @no_fastcomp('fastcomp clang detects colors differently')
  def test_build_error_color(self):
    create_test_file('src.c', 'int main() {')
    returncode, output = self.run_on_pty([PYTHON, EMCC, 'src.c'])
    self.assertNotEqual(returncode, 0)
    self.assertIn(b"\x1b[1msrc.c:1:13: \x1b[0m\x1b[0;1;31merror: \x1b[0m\x1b[1mexpected '}'\x1b[0m", output)
    self.assertIn(b"shared:ERROR: \x1b[31m", output)

  @parameterized({
    'fno_diagnostics_color': ['-fno-diagnostics-color'],
    'fdiagnostics_color_never': ['-fdiagnostics-color=never'],
  })
  @no_windows('ptys and select are not available on windows')
  def test_pty_no_color(self, flag):
    with open('src.c', 'w') as f:
      f.write('int main() {')

    returncode, output = self.run_on_pty([PYTHON, EMCC, flag, 'src.c'])
    self.assertNotEqual(returncode, 0)
    self.assertNotIn(b'\x1b', output)

  @no_fastcomp('sanitizers are not supported on fastcomp')
  def test_sanitizer_color(self):
    create_test_file('src.c', '''
      #include <emscripten.h>
      int main() {
        int *p = 0, q;
        EM_ASM({ Module.printWithColors = true; });
        q = *p;
      }
    ''')
    run_process([PYTHON, EMCC, '-fsanitize=null', 'src.c'])
    output = run_js('a.out.js', stderr=PIPE, full_output=True)
    self.assertIn('\x1b[1msrc.c', output)

  @no_fastcomp('main param optimizations are upstream-only')
  def test_main_reads_params(self):
    create_test_file('no.c', '''
      int main() {
        return 42;
      }
    ''')
    run_process([PYTHON, EMCC, 'no.c', '-O3', '-o', 'no.js'])
    no = os.path.getsize('no.js')
    create_test_file('yes.c', '''
      int main(int argc, char **argv) {
        return argc;
      }
    ''')
    run_process([PYTHON, EMCC, 'yes.c', '-O3', '-o', 'yes.js'])
    yes = os.path.getsize('yes.js')
    # not having to set up argc/argv allows us to avoid including a
    # significant amount of JS for string support (which is not needed
    # otherwise in such a trivial program).
    self.assertLess(no, 0.95 * yes)

  @no_fastcomp('not optimized in fastcomp')
  def test_INCOMING_MODULE_JS_API(self):
    def test(args):
      run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-O3', '--closure', '1'] + args)
      for engine in JS_ENGINES:
        self.assertContained('hello, world!', run_js('a.out.js', engine=engine))
      with open('a.out.js') as f:
        # ignore \r which on windows can increase the size
        return len(f.read().replace('\r', ''))
    normal = test([])
    changed = test(['-s', 'INCOMING_MODULE_JS_API=[]'])
    print('sizes', normal, changed)
    # Changing this option to [] should decrease code size.
    self.assertLess(changed, normal)
    # Check an absolute code size as well, with some slack.
    self.assertLess(abs(changed - 5795), 150)

  def test_llvm_includes(self):
    self.build('#include <stdatomic.h>', self.get_dir(), 'atomics.c')

  def test_mmap_and_munmap(self):
    emcc_args = []
    for f in ['data_ro.dat', 'data_rw.dat']:
        create_test_file(f, 'Test file')
        emcc_args.extend(['--embed-file', f])
    self.do_other_test('mmap_and_munmap', emcc_args)

  def test_mmap_memorygrowth(self):
    self.do_other_test('mmap_memorygrowth', ['-s', 'ALLOW_MEMORY_GROWTH=1'])

  @no_fastcomp('fastcomp defines this in the backend itself, so it is always on there')
  def test_EMSCRIPTEN_and_STRICT(self):
    # __EMSCRIPTEN__ is the proper define; we support EMSCRIPTEN for legacy
    # code, unless STRICT is enabled.
    create_test_file('src.c', '''
      #ifndef EMSCRIPTEN
      #error "not defined"
      #endif
    ''')
    run_process([PYTHON, EMCC, 'src.c', '-c'])
    self.expect_fail([PYTHON, EMCC, 'src.c', '-s', 'STRICT', '-c'])

  def test_exception_settings(self):
    for catching, throwing, opts in itertools.product([0, 1], repeat=3):
      cmd = [PYTHON, EMCC, path_from_root('tests', 'other', 'exceptions_modes_symbols_defined.cpp'), '-s', 'DISABLE_EXCEPTION_THROWING=%d' % (1 - throwing), '-s', 'DISABLE_EXCEPTION_CATCHING=%d' % (1 - catching), '-O%d' % opts]
      print(cmd)
      if not throwing and not catching:
        self.assertContained('DISABLE_EXCEPTION_THROWING was set (likely due to -fno-exceptions), which means no C++ exception throwing support code is linked in, but such support is required', self.expect_fail(cmd))
      elif not throwing and catching:
        self.assertContained('DISABLE_EXCEPTION_THROWING was set (probably from -fno-exceptions) but is not compatible with enabling exception catching (DISABLE_EXCEPTION_CATCHING=0)', self.expect_fail(cmd))
      else:
        run_process(cmd)

  def test_assertions_on_internal_api_changes(self):
    create_test_file('src.c', r'''
      #include <emscripten.h>
      int main(int argc, char **argv) {
        EM_ASM({
          try {
            Module['read'];
            out('it should not be there');
          } catch(e) {
            out('error: ' + e);
          }
        });
      }
    ''')
    run_process([PYTHON, EMCC, 'src.c', '-s', 'ASSERTIONS'])
    self.assertContained('Module.read has been replaced with plain read', run_js('a.out.js'))

  def test_assertions_on_incoming_module_api_changes(self):
    create_test_file('pre.js', r'''
      var Module = {
        read: function() {}
      }
    ''')
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'), '-s', 'ASSERTIONS', '--pre-js', 'pre.js'])
    self.assertContained('Module.read option was removed', run_js('a.out.js', assert_returncode=None, stderr=PIPE))

  def test_assertions_on_outgoing_module_api_changes(self):
    create_test_file('src.cpp', r'''
      #include <emscripten.h>
      int main() {
        EM_ASM({
          console.log();
          function check(name) {
            try {
              Module[name];
              console.log("success: " + name);
            } catch(e) {
            }
          }
          check("read");
          // TODO check("setWindowTitle");
          check("wasmBinary");
          check("arguments");
        });
      }
    ''')
    run_process([PYTHON, EMCC, 'src.cpp', '-s', 'ASSERTIONS'])
    self.assertContained('''
Module.read has been replaced with plain read_
Module.wasmBinary has been replaced with plain wasmBinary
Module.arguments has been replaced with plain arguments_
''', run_js('a.out.js', assert_returncode=None, stderr=PIPE))

  def test_em_asm_strict_c(self):
    create_test_file('src.c', '''
      #include <emscripten/em_asm.h>
      int main() {
        EM_ASM({ console.log('Hello, world!'); });
      }
    ''')
    result = run_process([PYTHON, EMCC, '-std=c11', 'src.c'], stderr=PIPE, check=False)
    self.assertNotEqual(result.returncode, 0)
    self.assertIn('EM_ASM does not work in -std=c* modes, use -std=gnu* modes instead', result.stderr)

  def test_boost_graph(self):
    self.do_smart_test(path_from_root('tests', 'test_boost_graph.cpp'),
                       emcc_args=['-s', 'USE_BOOST_HEADERS=1'],
                       assert_returncode=0)

  @no_fastcomp('EM_ASM and setjmp works fine on fastcomp')
  def test_setjmp_em_asm(self):
    create_test_file('src.c', '''
      #include <emscripten.h>
      #include <setjmp.h>

      int main() {
        jmp_buf buf;
        setjmp(buf);
        EM_ASM({
          console.log("hello world");
        });
      }
    ''')
    result = run_process([PYTHON, EMCC, 'src.c'], stderr=PIPE, check=False)
    self.assertNotEqual(result.returncode, 0)
    self.assertIn('Cannot use EM_ASM* alongside setjmp/longjmp', result.stderr)
    self.assertIn('Please consider using EM_JS, or move the EM_ASM into another function.', result.stderr)

  def test_missing_stdlibs(self):
    # Certain standard libraries are expected to be useable via -l flags but
    # don't actually exist in our standard library path.  Make sure we don't
    # error out when linking with these flags.
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-lm', '-ldl', '-lrt', '-lpthread'])

  def test_non_wasm_without_wasm_in_vm(self):
    # Test that our non-wasm output does not depend on wasm support in the vm.
    run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.cpp'), '-s', 'WASM=0'])
    with open('a.out.js') as f:
      js = f.read()
    with open('a.out.js', 'w') as f:
      f.write('var WebAssembly = null;\n' + js)
    for engine in JS_ENGINES:
      self.assertContained('hello, world!', run_js('a.out.js', engine=engine))