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- # ===========================================================================
- # http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
- #
- # DESCRIPTION
- #
- # Check whether the given FLAG works with the linker or gives an error.
- # (Warnings, however, are ignored)
- #
- # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
- # success/failure.
- #
- # If EXTRA-FLAGS is defined, it is added to the linker's default flags
- # when the check is done. The check is thus made with the flags: "LDFLAGS
- # EXTRA-FLAGS FLAG". This can for example be used to force the linker to
- # issue an error when a bad flag is given.
- #
- # INPUT gives an alternative input source to AC_LINK_IFELSE.
- #
- # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
- # macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
- #
- # LICENSE
- #
- # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
- # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
- #
- # 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 3 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 4
-
- AC_DEFUN([AX_CHECK_LINK_FLAG],
- [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
- AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
- AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
- ax_check_save_flags=$LDFLAGS
- LDFLAGS="$LDFLAGS $4 $1"
- AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
- [AS_VAR_SET(CACHEVAR,[yes])],
- [AS_VAR_SET(CACHEVAR,[no])])
- LDFLAGS=$ax_check_save_flags])
- AS_VAR_IF(CACHEVAR,yes,
- [m4_default([$2], :)],
- [m4_default([$3], :)])
- AS_VAR_POPDEF([CACHEVAR])dnl
- ])dnl AX_CHECK_LINK_FLAGS
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