Port: Add support for linkers with no support for 'no-as-needed'
[babeltrace.git] / m4 / ax_check_link_flag.m4
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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], [INPUT])
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# INPUT gives an alternative input source to AC_LINK_IFELSE.
23#
24# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25# macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
26#
27# LICENSE
28#
29# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
30# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
31#
32# This program is free software: you can redistribute it and/or modify it
33# under the terms of the GNU General Public License as published by the
34# Free Software Foundation, either version 3 of the License, or (at your
35# option) any later version.
36#
37# This program is distributed in the hope that it will be useful, but
38# WITHOUT ANY WARRANTY; without even the implied warranty of
39# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
40# Public License for more details.
41#
42# You should have received a copy of the GNU General Public License along
43# with this program. If not, see <http://www.gnu.org/licenses/>.
44#
45# As a special exception, the respective Autoconf Macro's copyright owner
46# gives unlimited permission to copy, distribute and modify the configure
47# scripts that are the output of Autoconf when processing the Macro. You
48# need not follow the terms of the GNU General Public License when using
49# or distributing such scripts, even though portions of the text of the
50# Macro appear in them. The GNU General Public License (GPL) does govern
51# all other use of the material that constitutes the Autoconf Macro.
52#
53# This special exception to the GPL applies to versions of the Autoconf
54# Macro released by the Autoconf Archive. When you make and distribute a
55# modified version of the Autoconf Macro, you may extend this special
56# exception to the GPL to apply to your modified version as well.
57
58#serial 4
59
60AC_DEFUN([AX_CHECK_LINK_FLAG],
61[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
62AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
63AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
64 ax_check_save_flags=$LDFLAGS
65 LDFLAGS="$LDFLAGS $4 $1"
66 AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
67 [AS_VAR_SET(CACHEVAR,[yes])],
68 [AS_VAR_SET(CACHEVAR,[no])])
69 LDFLAGS=$ax_check_save_flags])
70AS_VAR_IF(CACHEVAR,yes,
71 [m4_default([$2], :)],
72 [m4_default([$3], :)])
73AS_VAR_POPDEF([CACHEVAR])dnl
74])dnl AX_CHECK_LINK_FLAGS
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