/[svn]/ircd-hybrid/trunk/m4/ax_check_compile_flag.m4
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Contents of /ircd-hybrid/trunk/m4/ax_check_compile_flag.m4

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Revision 6053 - (show annotations)
Thu Jun 4 17:11:06 2015 UTC (7 years, 8 months ago) by michael
File size: 3330 byte(s)
- Update ax_check_compile_flag.m4 to latest version

1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
8 #
9 # DESCRIPTION
10 #
11 # Check whether the given FLAG works with the current language's compiler
12 # or gives an error. (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 current language's default
18 # flags (e.g. CFLAGS) when the check is done. The check is thus made with
19 # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
20 # force the compiler to issue an error when a bad flag is given.
21 #
22 # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
23 #
24 # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25 # macro in sync with AX_CHECK_{PREPROC,LINK}_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
60 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
61 [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
62 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
63 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
64 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
65 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
66 AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
67 [AS_VAR_SET(CACHEVAR,[yes])],
68 [AS_VAR_SET(CACHEVAR,[no])])
69 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
70 AS_VAR_IF(CACHEVAR,yes,
71 [m4_default([$2], :)],
72 [m4_default([$3], :)])
73 AS_VAR_POPDEF([CACHEVAR])dnl
74 ])dnl AX_CHECK_COMPILE_FLAGS

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