1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS]) 8# 9# DESCRIPTION 10# 11# Check whether the given FLAG works with the linker or gives an error. 12# (Warnings, however, are ignored) 13# 14# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 15# success/failure. 16# 17# If EXTRA-FLAGS is defined, it is added to the linker's default flags 18# when the check is done. The check is thus made with the flags: "LDFLAGS 19# EXTRA-FLAGS FLAG". This can for example be used to force the linker to 20# issue an error when a bad flag is given. 21# 22# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 23# macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG. 24# 25# LICENSE 26# 27# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 28# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> 29# 30# This program is free software: you can redistribute it and/or modify it 31# under the terms of the GNU General Public License as published by the 32# Free Software Foundation, either version 3 of the License, or (at your 33# option) any later version. 34# 35# This program is distributed in the hope that it will be useful, but 36# WITHOUT ANY WARRANTY; without even the implied warranty of 37# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 38# Public License for more details. 39# 40# You should have received a copy of the GNU General Public License along 41# with this program. If not, see <http://www.gnu.org/licenses/>. 42# 43# As a special exception, the respective Autoconf Macro's copyright owner 44# gives unlimited permission to copy, distribute and modify the configure 45# scripts that are the output of Autoconf when processing the Macro. You 46# need not follow the terms of the GNU General Public License when using 47# or distributing such scripts, even though portions of the text of the 48# Macro appear in them. The GNU General Public License (GPL) does govern 49# all other use of the material that constitutes the Autoconf Macro. 50# 51# This special exception to the GPL applies to versions of the Autoconf 52# Macro released by the Autoconf Archive. When you make and distribute a 53# modified version of the Autoconf Macro, you may extend this special 54# exception to the GPL to apply to your modified version as well. 55 56#serial 2 57 58AC_DEFUN([AX_CHECK_LINK_FLAG], 59[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl 60AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ 61 ax_check_save_flags=$LDFLAGS 62 LDFLAGS="$LDFLAGS $4 $1" 63 AC_LINK_IFELSE([AC_LANG_PROGRAM()], 64 [AS_VAR_SET(CACHEVAR,[yes])], 65 [AS_VAR_SET(CACHEVAR,[no])]) 66 LDFLAGS=$ax_check_save_flags]) 67AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], 68 [m4_default([$2], :)], 69 [m4_default([$3], :)]) 70AS_VAR_POPDEF([CACHEVAR])dnl 71])dnl AX_CHECK_LINK_FLAGS 72