1#http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_check_linker_flags.m4
2# ===========================================================================
3#   http://www.gnu.org/software/autoconf-archive/ax_check_linker_flags.html
4# ===========================================================================
5#
6# SYNOPSIS
7#
8#   AX_CHECK_LINKER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
9#
10# DESCRIPTION
11#
12#   Check whether the given linker FLAGS work with the current language's
13#   linker, or whether they give an error.
14#
15#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
16#   success/failure.
17#
18#   NOTE: Based on AX_CHECK_COMPILER_FLAGS.
19#
20# LICENSE
21#
22#   Copyright (c) 2009 Mike Frysinger <vapier@gentoo.org>
23#   Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
24#   Copyright (c) 2009 Matteo Frigo
25#
26#   This program is free software: you can redistribute it and/or modify it
27#   under the terms of the GNU General Public License as published by the
28#   Free Software Foundation, either version 3 of the License, or (at your
29#   option) any later version.
30#
31#   This program is distributed in the hope that it will be useful, but
32#   WITHOUT ANY WARRANTY; without even the implied warranty of
33#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
34#   Public License for more details.
35#
36#   You should have received a copy of the GNU General Public License along
37#   with this program. If not, see <http://www.gnu.org/licenses/>.
38#
39#   As a special exception, the respective Autoconf Macro's copyright owner
40#   gives unlimited permission to copy, distribute and modify the configure
41#   scripts that are the output of Autoconf when processing the Macro. You
42#   need not follow the terms of the GNU General Public License when using
43#   or distributing such scripts, even though portions of the text of the
44#   Macro appear in them. The GNU General Public License (GPL) does govern
45#   all other use of the material that constitutes the Autoconf Macro.
46#
47#   This special exception to the GPL applies to versions of the Autoconf
48#   Macro released by the Autoconf Archive. When you make and distribute a
49#   modified version of the Autoconf Macro, you may extend this special
50#   exception to the GPL to apply to your modified version as well.
51
52#serial 6
53
54AC_DEFUN([AX_CHECK_LINKER_FLAGS],
55[AC_MSG_CHECKING([whether the linker accepts $1])
56dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
57AS_LITERAL_IF([$1],
58  [AC_CACHE_VAL(AS_TR_SH(ax_cv_linker_flags_[$1]), [
59      ax_save_FLAGS=$LDFLAGS
60      LDFLAGS="$1"
61      AC_LINK_IFELSE([AC_LANG_PROGRAM()],
62        AS_TR_SH(ax_cv_linker_flags_[$1])=yes,
63        AS_TR_SH(ax_cv_linker_flags_[$1])=no)
64      LDFLAGS=$ax_save_FLAGS])],
65  [ax_save_FLAGS=$LDFLAGS
66   LDFLAGS="$1"
67   AC_LINK_IFELSE([AC_LANG_PROGRAM()],
68     eval AS_TR_SH(ax_cv_linker_flags_[$1])=yes,
69     eval AS_TR_SH(ax_cv_linker_flags_[$1])=no)
70   LDFLAGS=$ax_save_FLAGS])
71eval ax_check_linker_flags=$AS_TR_SH(ax_cv_linker_flags_[$1])
72AC_MSG_RESULT($ax_check_linker_flags)
73if test "x$ax_check_linker_flags" = xyes; then
74	m4_default([$2], :)
75else
76	m4_default([$3], :)
77fi
78])dnl AX_CHECK_LINKER_FLAGS
79