blob: 467ce9f437865f06fed89ad82c68c321d0d3d011 [file] [log] [blame]
# libnih
#
# compiler.m4 - autoconf macros for compiler settings
#
# Copyright © 2006 Scott James Remnant <scott@netsplit.com>.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# Ensure that misc.m4 is included
m4_ifndef([_NIH_AC_COPYRIGHT], [m4_include([m4/misc.m4])])
# NIH_COMPILER_WARNINGS
# ---------------------
# Add configure option to enable additional compiler warnings and treat
# them as errors.
AC_DEFUN([NIH_COMPILER_WARNINGS],
[AC_ARG_ENABLE(compiler-warnings,
AS_HELP_STRING([--enable-compiler-warnings],
[Enable additional compiler warnings]),
[if test "x$enable_compiler_warnings" = "xyes"; then
if test "x$GCC" = "xyes"; then
CFLAGS="-Wall -Werror $CFLAGS"
fi
if test "x$GXX" = "xyes"; then
CXXFLAGS="-Wall -Werror $CXXFLAGS"
fi
fi])dnl
])# NIH_COMPILER_WARNINGS
# NIH_COMPILER_OPTIMISATIONS
# --------------------------
# Add configure option to disable optimisations.
AC_DEFUN([NIH_COMPILER_OPTIMISATIONS],
[AC_ARG_ENABLE(compiler-optimisations,
AS_HELP_STRING([--disable-compiler-optimisations],
[Disable compiler optimisations]),
[if test "x$enable_compiler_optimisations" = "xno"; then
[CFLAGS=`echo "$CFLAGS" | sed -e "s/ -O[1-9]*\b/ -O0/g"`]
[CXXFLAGS=`echo "$CXXFLAGS" | sed -e "s/ -O[1-9]*\b/ -O0/g"`]
fi])dnl
])# NIH_COMPILER_OPTIMISATIONS
# NIH_COMPILER_COVERAGE
# ----------------------
# Add configure option to enable coverage data.
AC_DEFUN([NIH_COMPILER_COVERAGE],
[AC_ARG_ENABLE(compiler-coverage,
AS_HELP_STRING([--enable-compiler-coverage],
[Enable generation of coverage data]),
[if test "x$enable_compiler_coverage" = "xyes"; then
if test "x$GCC" = "xyes"; then
CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage"
fi
if test "x$GXX" = "xyes"; then
CXXFLAGS="$CXXFLAGS -fprofile-arcs -ftest-coverage"
fi
fi])dnl
])# NIH_COMPILER_COVERAGE
# NIH_TRY_C99([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# -----------------------------------------------------
# Try compiling some C99 code to see whether it works.
AC_DEFUN([NIH_TRY_C99],
[AC_TRY_COMPILE([
#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>
/* Variadic macro arguments */
#define variadic_macro(foo, ...) printf(foo, __VA_ARGS__)
],
[
/* Compound initialisers */
struct { int a, b; } foo = { .a = 1, .b = 2 };
/* Boolean type */
bool bar = false;
/* Specific size type */
uint32_t baz = 0;
/* C99-style for-loop declarations */
for (int i = 0; i < 10; i++)
continue;
/* Magic __func__ variable */
printf("%s", __func__);
], [$1], [$2])dnl
])# NIH_TRY_C99
# NIH_C_C99
# ----------
# Check whether the compiler can do C99, adding a compiler flag if
# necessary.
AC_DEFUN([NIH_C_C99],
[AC_CACHE_CHECK([whether compiler supports C99 features], [nih_cv_c99],
[NIH_TRY_C99([nih_cv_c99=yes], [nih_cv_c99=no])])
AS_IF([test "x$nih_cv_c99" = "xyes"],
[AC_DEFINE([HAVE_C99], 1, [Define to 1 if the compiler supports C99.])],
[AC_CACHE_CHECK([what argument makes compiler support C99 features],
[nih_cv_c99_arg],
[nih_cv_c99_arg=none
nih_save_CC="$CC"
for arg in "-std=gnu99" "-std=c99" "-c99"; do
CC="$nih_save_CC $arg"
NIH_TRY_C99([nih_arg_worked=yes], [nih_arg_worked=no])
CC="$nih_save_CC"
AS_IF([test "x$nih_arg_worked" = "xyes"],
[nih_cv_c99_arg="$arg"; break])
done])
AS_IF([test "x$nih_cv_c99_arg" != "xnone"],
[CC="$CC $nih_cv_c99_arg"
AC_DEFINE([HAVE_C99], 1)])])[]dnl
])# NIH_C_C99