1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_gcc_option.html 3# =========================================================================== 4# 5# OBSOLETE MACRO 6# 7# Deprecated in favor of AX_C_CHECK_FLAG, AX_CXX_CHECK_FLAG, 8# AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG. 9# 10# SYNOPSIS 11# 12# AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL) 13# 14# DESCRIPTION 15# 16# AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts 17# the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise 18# ACTION-IF-UNSUCCESSFUL. 19# 20# A typical usage should be the following one: 21# 22# AX_GCC_OPTION([-fomit-frame-pointer],[],[],[ 23# AC_MSG_NOTICE([The option is supported])],[ 24# AC_MSG_NOTICE([No luck this time]) 25# ]) 26# 27# The macro doesn't discriminate between languages so, if you are testing 28# for an option that works for C++ but not for C you should use '-x c++' 29# as EXTRA-OPTIONS: 30# 31# AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ]) 32# 33# OPTION is tested against the following code: 34# 35# int main() 36# { 37# return 0; 38# } 39# 40# The optional TEST-PROGRAM comes handy when the default main() is not 41# suited for the option being checked 42# 43# So, if you need to test for -fstrict-prototypes option you should 44# probably use the macro as follows: 45# 46# AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[ 47# int main(int argc, char ** argv) 48# { 49# (void) argc; 50# (void) argv; 51# 52# return 0; 53# } 54# ],[ ... ],[ ... ]) 55# 56# Note that the macro compiles but doesn't link the test program so it is 57# not suited for checking options that are passed to the linker, like: 58# 59# -Wl,-L<a-library-path> 60# 61# In order to avoid such kind of problems you should think about usinguse 62# the AX_*_CHECK_FLAG family macros 63# 64# LICENSE 65# 66# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net> 67# Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl> 68# 69# This program is free software; you can redistribute it and/or modify it 70# under the terms of the GNU General Public License as published by the 71# Free Software Foundation; either version 2 of the License, or (at your 72# option) any later version. 73# 74# This program is distributed in the hope that it will be useful, but 75# WITHOUT ANY WARRANTY; without even the implied warranty of 76# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 77# Public License for more details. 78# 79# You should have received a copy of the GNU General Public License along 80# with this program. If not, see <http://www.gnu.org/licenses/>. 81# 82# As a special exception, the respective Autoconf Macro's copyright owner 83# gives unlimited permission to copy, distribute and modify the configure 84# scripts that are the output of Autoconf when processing the Macro. You 85# need not follow the terms of the GNU General Public License when using 86# or distributing such scripts, even though portions of the text of the 87# Macro appear in them. The GNU General Public License (GPL) does govern 88# all other use of the material that constitutes the Autoconf Macro. 89# 90# This special exception to the GPL applies to versions of the Autoconf 91# Macro released by the Autoconf Archive. When you make and distribute a 92# modified version of the Autoconf Macro, you may extend this special 93# exception to the GPL to apply to your modified version as well. 94 95#serial 13 96 97AC_DEFUN([AX_GCC_OPTION], [ 98 AC_REQUIRE([AC_PROG_CC]) 99 100 AC_MSG_CHECKING([if gcc accepts $1 option]) 101 102 AS_IF([ test "x$GCC" = "xyes" ],[ 103 AS_IF([ test -z "$3" ],[ 104 ax_gcc_option_test="int main() 105{ 106 return 0; 107}" 108 ],[ 109 ax_gcc_option_test="$3" 110 ]) 111 112 # Dump the test program to file 113 cat <<EOF > conftest.c 114$ax_gcc_option_test 115EOF 116 117 # Dump back the file to the log, useful for debugging purposes 118 AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD) 119 120 AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[ 121 AC_MSG_RESULT([yes]) 122 $4 123 ],[ 124 AC_MSG_RESULT([no]) 125 $5 126 ]) 127 ],[ 128 AC_MSG_RESULT([no gcc available]) 129 ]) 130]) 131