source: trunk/m4/ax_check_link_flag.m4 @ 2724

Last change on this file since 2724 was 2724, checked in by Peter, 7 years ago

set svncopyright:ignore property

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Date
File size: 3.0 KB
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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])
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
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