chrome/android/chrome_common_shared_library.gni

# Copyright 2018 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//base/android/linker/config.gni")
import("//build/config/android/config.gni")
import("//build/config/android/linker_version_script.gni")
import("//build/config/compiler/compiler.gni")
import("//device/vr/buildflags/buildflags.gni")

# These variables control whether app bundles use the same native libraries as
# the APK, or bundle-specific versions. The bundle-specific versions may
# diverge when code is moved from the base library into dynamic feature
# modules. The variables can be removed when the bundle-specific lib
# configuration has stabilized.
bundle_library_suffix = "_base"
bundle_pak_asset_type = "bundle"

# This value is set downstream for internal builds.
if (!defined(default_chrome_orderfile)) {
  default_chrome_orderfile = ""
}

declare_args() {
  # Path to a linker orderfile to use for libchrome.so, libmonochrome.so, etc.
  chrome_orderfile = default_chrome_orderfile
}

# This template contains all common configuration for native shared libraries,
# including libchrome, monochrome, standalone webview (also called monochrome),
# and libchromefortest (used by chrome_public_test_apk).
#
# Variables:
#    export_symbol_whitelist: Optional. If set, a pre-determined list of additional
#      methods are exposed by the resulting library.
#    is_monochrome: Optional. If set, the library is for use in monochrome.
#    is_webview: If true, the library is for webview, and browser-specific
#      config is skipped.
template("chrome_common_shared_library") {
  _is_monochrome = defined(invoker.is_monochrome) && invoker.is_monochrome
  _is_webview = defined(invoker.is_webview) && invoker.is_webview
  _export_java_symbols = _is_monochrome || _is_webview

  _linker_script = "$target_gen_dir/${target_name}_linker_script.txt"
  _linker_script_target = "${target_name}_linker_script"

  # Create a custom linker script based on JNI and feature module requirements.
  generate_linker_version_script(_linker_script_target) {
    linker_script = _linker_script
    export_java_symbols = _export_java_symbols
    if (defined(invoker.export_symbol_whitelist)) {
      export_symbol_whitelist_file =
          "//chrome/android/feature_module_exports.lst"
    }
  }

  shared_library(target_name) {
    forward_variables_from(invoker, "*", [ "export_symbol_whitelist" ])
    if (!_is_webview) {
      deps += [ "//chrome:chrome_android_core" ]
    }

    configs += [ "//chrome/android:orderfile_config" ]
    public_configs = extra_chrome_shared_library_configs
    deps += extra_chrome_shared_library_deps

    # Use a dynamically-generated linker script.
    configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
    deps += [ ":$_linker_script_target" ]
    inputs = [
      "$_linker_script",
    ]
    if (!defined(ldflags)) {
      ldflags = []
    }
    ldflags += [ "-Wl,--version-script=" +
                 rebase_path(_linker_script, root_build_dir) ]

    # Handle VR JNI regisration and dependencies.
    if (!_is_webview && enable_vr) {
      if (_export_java_symbols) {
        # NOTE: While this is file is named *_monochrome.cc, it just contains
        # an empty vr::RegisterJni() function that returns true.
        sources += [ "../browser/android/vr/register_jni_monochrome.cc" ]
      } else {
        sources += [ "../browser/android/vr/register_jni.cc" ]
        deps += [
          "//chrome/browser/android/vr:jni_registration($default_toolchain)",
        ]
      }
    }

    # Compress relocations if needed.
    if ((_is_monochrome || _is_webview || chromium_linker_supported) &&
        use_lld) {
      configs += [ "//build/config/android:lld_pack_relocations" ]
    }

    if ((_is_monochrome || _is_webview || chromium_linker_supported) &&
        target_cpu != "mipsel" && target_cpu != "mips64el") {
      # By default, the static linker will create ELF executables with both
      # SysV and GNU hash tables. Now that the chromium linker supports the GNU
      # format, which is considerably smaller, ensure that the SysV one is
      # never compiled in the final library (http://crbug.com/742525#c28). GNU
      # hash support was added in Android M. Also not supported on MIPS
      # architecture (http://crbug.com/811306).
      ldflags += [ "-Wl,--hash-style=gnu" ]
    }

    # See crbug.com/705088.
    if (target_cpu == "arm" && is_asan) {
      ldflags += [ "-Wl,--long-plt" ]
    }
  }
}