74 lines
3.1 KiB
Plaintext
74 lines
3.1 KiB
Plaintext
# ===========================================================================
|
|
# http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
|
|
# ===========================================================================
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
|
|
#
|
|
# 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.
|
|
#
|
|
# 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 $1"
|
|
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
|
|
[[char x[42U];if (fgets(x,1000,stdin)) puts(x)]])],
|
|
[AS_VAR_SET(CACHEVAR,[yes])],
|
|
[AS_VAR_SET(CACHEVAR,[no])])
|
|
LDFLAGS=$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
|