1 # SPDX-License-Identifier: GPL-2.0-or-later WITH LicenseRef-Autoconf-exception-macro
2 # ===========================================================================
3 # https://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
4 # ===========================================================================
12 # Provides a test for the compiler support of __attribute__ extensions.
13 # Defines HAVE___ATTRIBUTE__ if it is found.
17 # Copyright (c) 2008 Stepan Kasal <skasal@redhat.com>
18 # Copyright (c) 2008 Christian Haggstrom
19 # Copyright (c) 2008 Ryan McCabe <ryan@numb.org>
21 # This program is free software; you can redistribute it and/or modify it
22 # under the terms of the GNU General Public License as published by the
23 # Free Software Foundation; either version 2 of the License, or (at your
24 # option) any later version.
26 # This program is distributed in the hope that it will be useful, but
27 # WITHOUT ANY WARRANTY; without even the implied warranty of
28 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
29 # Public License for more details.
31 # You should have received a copy of the GNU General Public License along
32 # with this program. If not, see <https://www.gnu.org/licenses/>.
34 # As a special exception, the respective Autoconf Macro's copyright owner
35 # gives unlimited permission to copy, distribute and modify the configure
36 # scripts that are the output of Autoconf when processing the Macro. You
37 # need not follow the terms of the GNU General Public License when using
38 # or distributing such scripts, even though portions of the text of the
39 # Macro appear in them. The GNU General Public License (GPL) does govern
40 # all other use of the material that constitutes the Autoconf Macro.
42 # This special exception to the GPL applies to versions of the Autoconf
43 # Macro released by the Autoconf Archive. When you make and distribute a
44 # modified version of the Autoconf Macro, you may extend this special
45 # exception to the GPL to apply to your modified version as well.
49 AC_DEFUN([AX_C___ATTRIBUTE__], [
50 AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
54 static void foo(void) __attribute__ ((unused));
60 [ax_cv___attribute__=yes],
61 [ax_cv___attribute__=no]
64 if test "$ax_cv___attribute__" = "yes"; then
65 AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__])