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Diffstat (limited to 'm4/ax_ld_check_flag.m4')
| -rw-r--r-- | m4/ax_ld_check_flag.m4 | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/m4/ax_ld_check_flag.m4 b/m4/ax_ld_check_flag.m4 new file mode 100644 index 0000000..898168a --- /dev/null +++ b/m4/ax_ld_check_flag.m4 @@ -0,0 +1,85 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_ld_check_flag.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_LDFLAGS_OPTION(FLAG-TO-CHECK,[VAR],[NOTFOUND]) +# +# DESCRIPTION +# +# This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If +# successfull add it to VAR. +# +# This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to +# Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes. +# +# This version has been (heavily) modified by Vincent Bernat +# <bernat@luffy.cx> to match AX_CFLAGS_GCC_OPTION. +# +# 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_LDFLAGS_OPTION],[ + AC_PREREQ([2.69]) + AC_REQUIRE([AC_PROG_SED]) + + flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'` + + AC_CACHE_CHECK([whether the linker accepts the $1 flag], + [ax_cv_ld_check_flag_$flag],[ + + AC_LANG_SAVE + AC_LANG([C]) + + save_LDFLAGS="$LDFLAGS" + LDFLAGS="-Werror $LDFLAGS $[]m4_ifval($2,$2,) $1" + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([],[]) + ],[ + eval "ax_cv_ld_check_flag_$flag=yes" + ],[ + eval "ax_cv_ld_check_flag_$flag=no" + ]) + + LDFLAGS="$save_LDFLAGS" + + AC_LANG_RESTORE + + ]) + + AS_IF([eval "test \"`echo '$ax_cv_ld_check_flag_'$flag`\" = yes"],[ + m4_ifval($2,$2,LDFLAGS)="$[]m4_ifval($2,$2,LDFLAGS) $1" + ],[ + :; $3 + ]) +]) |