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1 | # =========================================================================== |
2 | # http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html | |
3 | # =========================================================================== | |
4 | # | |
5 | # SYNOPSIS | |
6 | # | |
7 | # AX_C___ATTRIBUTE__ | |
8 | # | |
9 | # DESCRIPTION | |
10 | # | |
11 | # Provides a test for the compiler support of __attribute__ extensions. | |
12 | # Defines HAVE___ATTRIBUTE__ if it is found. | |
13 | # | |
14 | # LICENSE | |
15 | # | |
16 | # Copyright (c) 2008 Stepan Kasal <skasal@redhat.com> | |
17 | # Copyright (c) 2008 Christian Haggstrom | |
18 | # Copyright (c) 2008 Ryan McCabe <ryan@numb.org> | |
19 | # | |
20 | # This program is free software; you can redistribute it and/or modify it | |
21 | # under the terms of the GNU General Public License as published by the | |
22 | # Free Software Foundation; either version 2 of the License, or (at your | |
23 | # option) any later version. | |
24 | # | |
25 | # This program is distributed in the hope that it will be useful, but | |
26 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
28 | # Public License for more details. | |
29 | # | |
30 | # You should have received a copy of the GNU General Public License along | |
31 | # with this program. If not, see <http://www.gnu.org/licenses/>. | |
32 | # | |
33 | # As a special exception, the respective Autoconf Macro's copyright owner | |
34 | # gives unlimited permission to copy, distribute and modify the configure | |
35 | # scripts that are the output of Autoconf when processing the Macro. You | |
36 | # need not follow the terms of the GNU General Public License when using | |
37 | # or distributing such scripts, even though portions of the text of the | |
38 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
39 | # all other use of the material that constitutes the Autoconf Macro. | |
40 | # | |
41 | # This special exception to the GPL applies to versions of the Autoconf | |
42 | # Macro released by the Autoconf Archive. When you make and distribute a | |
43 | # modified version of the Autoconf Macro, you may extend this special | |
44 | # exception to the GPL to apply to your modified version as well. | |
45 | ||
46 | #serial 8 | |
47 | ||
48 | AC_DEFUN([AX_C___ATTRIBUTE__], [ | |
49 | AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__], | |
50 | [AC_COMPILE_IFELSE( | |
51 | [AC_LANG_PROGRAM( | |
52 | [[#include <stdlib.h> | |
53 | static void foo(void) __attribute__ ((unused)); | |
54 | static void | |
55 | foo(void) { | |
56 | exit(1); | |
57 | } | |
58 | ]], [])], | |
59 | [ax_cv___attribute__=yes], | |
60 | [ax_cv___attribute__=no] | |
61 | ) | |
62 | ]) | |
63 | if test "$ax_cv___attribute__" = "yes"; then | |
64 | AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__]) | |
65 | fi | |
66 | ]) |