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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_c_check_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
#
# DESCRIPTION
#
# This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If
# successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
# PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM
# macro.
#
# This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to
# Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes.
#
# LICENSE
#
# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 6
AC_DEFUN([AX_C_CHECK_FLAG],[
AC_PREREQ([2.61])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_SED])
flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'`
AC_CACHE_CHECK([whether the C compiler accepts the $1 flag],
[ax_cv_c_check_flag_$flag],[
AC_LANG_PUSH([C])
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([$2],[$3])
],[
eval "ax_cv_c_check_flag_$flag=yes"
],[
eval "ax_cv_c_check_flag_$flag=no"
])
CFLAGS="$save_CFLAGS"
AC_LANG_POP
])
AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[
:
$4
],[
:
$5
])
])
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