|
|
# ===========================================================================# 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 2
AC_DEFUN([AX_CHECK_LINK_FLAG],[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnlAC_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_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], [m4_default([$2], :)], [m4_default([$3], :)])AS_VAR_POPDEF([CACHEVAR])dnl])dnl AX_CHECK_LINK_FLAGS
|
