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:
58: AC_DEFUN([AX_CHECK_LINK_FLAG],
59: [AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
60: AC_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])
67: AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
68: [m4_default([$2], :)],
69: [m4_default([$3], :)])
70: AS_VAR_POPDEF([CACHEVAR])dnl
71: ])dnl AX_CHECK_LINK_FLAGS
72:
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