1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_c_check_flag.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE]) 8# 9# DESCRIPTION 10# 11# This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If 12# successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE. 13# PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM 14# macro. 15# 16# This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to 17# Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes. 18# 19# LICENSE 20# 21# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net> 22# 23# This program is free software; you can redistribute it and/or modify it 24# under the terms of the GNU General Public License as published by the 25# Free Software Foundation; either version 2 of the License, or (at your 26# option) any later version. 27# 28# This program is distributed in the hope that it will be useful, but 29# WITHOUT ANY WARRANTY; without even the implied warranty of 30# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 31# Public License for more details. 32# 33# You should have received a copy of the GNU General Public License along 34# with this program. If not, see <http://www.gnu.org/licenses/>. 35# 36# As a special exception, the respective Autoconf Macro's copyright owner 37# gives unlimited permission to copy, distribute and modify the configure 38# scripts that are the output of Autoconf when processing the Macro. You 39# need not follow the terms of the GNU General Public License when using 40# or distributing such scripts, even though portions of the text of the 41# Macro appear in them. The GNU General Public License (GPL) does govern 42# all other use of the material that constitutes the Autoconf Macro. 43# 44# This special exception to the GPL applies to versions of the Autoconf 45# Macro released by the Autoconf Archive. When you make and distribute a 46# modified version of the Autoconf Macro, you may extend this special 47# exception to the GPL to apply to your modified version as well. 48 49#serial 6 50 51AC_DEFUN([AX_C_CHECK_FLAG],[ 52 AC_PREREQ([2.61]) 53 AC_REQUIRE([AC_PROG_CC]) 54 AC_REQUIRE([AC_PROG_SED]) 55 56 flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'` 57 58 AC_CACHE_CHECK([whether the C compiler accepts the $1 flag], 59 [ax_cv_c_check_flag_$flag],[ 60 61 AC_LANG_PUSH([C]) 62 63 save_CFLAGS="$CFLAGS" 64 CFLAGS="$CFLAGS $1" 65 AC_COMPILE_IFELSE([ 66 AC_LANG_PROGRAM([$2],[$3]) 67 ],[ 68 eval "ax_cv_c_check_flag_$flag=yes" 69 ],[ 70 eval "ax_cv_c_check_flag_$flag=no" 71 ]) 72 73 CFLAGS="$save_CFLAGS" 74 75 AC_LANG_POP 76 77 ]) 78 79 AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[ 80 : 81 $4 82 ],[ 83 : 84 $5 85 ]) 86]) 87