1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
3 # ===========================================================================
11 # Provides a test for the compiler support of __attribute__ extensions.
12 # Defines HAVE___ATTRIBUTE__ if it is found.
16 # Copyright (c) 2008 Stepan Kasal <skasal@redhat.com>
17 # Copyright (c) 2008 Christian Haggstrom
18 # Copyright (c) 2008 Ryan McCabe <ryan@numb.org>
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.
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.
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/>.
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.
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.
48 AC_DEFUN([AX_C___ATTRIBUTE__], [
49 AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
53 static void foo(void) __attribute__ ((__unused__));
59 [ax_cv___attribute__=yes],
60 [ax_cv___attribute__=no]
63 if test "$ax_cv___attribute__" = "yes"; then
64 AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__])