1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_c_check_flag.html
3 # ===========================================================================
7 # AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
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
16 # This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to
17 # Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes.
21 # Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
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.
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.
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/>.
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.
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.
51 AC_DEFUN([AX_C_CHECK_FLAG],[
53 AC_REQUIRE([AC_PROG_CC])
54 AC_REQUIRE([AC_PROG_SED])
56 flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'`
58 AC_CACHE_CHECK([whether the C compiler accepts the $1 flag],
59 [ax_cv_c_check_flag_$flag],[
66 AC_LANG_PROGRAM([$2],[$3])
68 eval "ax_cv_c_check_flag_$flag=yes"
70 eval "ax_cv_c_check_flag_$flag=no"
79 AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[