1*8fa80f29Smrg# =========================================================================== 2*8fa80f29Smrg# http://www.gnu.org/software/autoconf-archive/ax_c_check_flag.html 3*8fa80f29Smrg# =========================================================================== 4*8fa80f29Smrg# 5*8fa80f29Smrg# SYNOPSIS 6*8fa80f29Smrg# 7*8fa80f29Smrg# AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE]) 8*8fa80f29Smrg# 9*8fa80f29Smrg# DESCRIPTION 10*8fa80f29Smrg# 11*8fa80f29Smrg# This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If 12*8fa80f29Smrg# successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE. 13*8fa80f29Smrg# PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM 14*8fa80f29Smrg# macro. 15*8fa80f29Smrg# 16*8fa80f29Smrg# This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to 17*8fa80f29Smrg# Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes. 18*8fa80f29Smrg# 19*8fa80f29Smrg# LICENSE 20*8fa80f29Smrg# 21*8fa80f29Smrg# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net> 22*8fa80f29Smrg# 23*8fa80f29Smrg# This program is free software; you can redistribute it and/or modify it 24*8fa80f29Smrg# under the terms of the GNU General Public License as published by the 25*8fa80f29Smrg# Free Software Foundation; either version 2 of the License, or (at your 26*8fa80f29Smrg# option) any later version. 27*8fa80f29Smrg# 28*8fa80f29Smrg# This program is distributed in the hope that it will be useful, but 29*8fa80f29Smrg# WITHOUT ANY WARRANTY; without even the implied warranty of 30*8fa80f29Smrg# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 31*8fa80f29Smrg# Public License for more details. 32*8fa80f29Smrg# 33*8fa80f29Smrg# You should have received a copy of the GNU General Public License along 34*8fa80f29Smrg# with this program. If not, see <http://www.gnu.org/licenses/>. 35*8fa80f29Smrg# 36*8fa80f29Smrg# As a special exception, the respective Autoconf Macro's copyright owner 37*8fa80f29Smrg# gives unlimited permission to copy, distribute and modify the configure 38*8fa80f29Smrg# scripts that are the output of Autoconf when processing the Macro. You 39*8fa80f29Smrg# need not follow the terms of the GNU General Public License when using 40*8fa80f29Smrg# or distributing such scripts, even though portions of the text of the 41*8fa80f29Smrg# Macro appear in them. The GNU General Public License (GPL) does govern 42*8fa80f29Smrg# all other use of the material that constitutes the Autoconf Macro. 43*8fa80f29Smrg# 44*8fa80f29Smrg# This special exception to the GPL applies to versions of the Autoconf 45*8fa80f29Smrg# Macro released by the Autoconf Archive. When you make and distribute a 46*8fa80f29Smrg# modified version of the Autoconf Macro, you may extend this special 47*8fa80f29Smrg# exception to the GPL to apply to your modified version as well. 48*8fa80f29Smrg 49*8fa80f29Smrg#serial 6 50*8fa80f29Smrg 51*8fa80f29SmrgAC_DEFUN([AX_C_CHECK_FLAG],[ 52*8fa80f29Smrg AC_PREREQ([2.61]) 53*8fa80f29Smrg AC_REQUIRE([AC_PROG_CC]) 54*8fa80f29Smrg AC_REQUIRE([AC_PROG_SED]) 55*8fa80f29Smrg 56*8fa80f29Smrg flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'` 57*8fa80f29Smrg 58*8fa80f29Smrg AC_CACHE_CHECK([whether the C compiler accepts the $1 flag], 59*8fa80f29Smrg [ax_cv_c_check_flag_$flag],[ 60*8fa80f29Smrg 61*8fa80f29Smrg AC_LANG_PUSH([C]) 62*8fa80f29Smrg 63*8fa80f29Smrg save_CFLAGS="$CFLAGS" 64*8fa80f29Smrg CFLAGS="$CFLAGS $1" 65*8fa80f29Smrg AC_COMPILE_IFELSE([ 66*8fa80f29Smrg AC_LANG_PROGRAM([$2],[$3]) 67*8fa80f29Smrg ],[ 68*8fa80f29Smrg eval "ax_cv_c_check_flag_$flag=yes" 69*8fa80f29Smrg ],[ 70*8fa80f29Smrg eval "ax_cv_c_check_flag_$flag=no" 71*8fa80f29Smrg ]) 72*8fa80f29Smrg 73*8fa80f29Smrg CFLAGS="$save_CFLAGS" 74*8fa80f29Smrg 75*8fa80f29Smrg AC_LANG_POP 76*8fa80f29Smrg 77*8fa80f29Smrg ]) 78*8fa80f29Smrg 79*8fa80f29Smrg AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[ 80*8fa80f29Smrg : 81*8fa80f29Smrg $4 82*8fa80f29Smrg ],[ 83*8fa80f29Smrg : 84*8fa80f29Smrg $5 85*8fa80f29Smrg ]) 86*8fa80f29Smrg]) 87