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- # ===========================================================================
- # https://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_C___ATTRIBUTE__
- #
- # DESCRIPTION
- #
- # Provides a test for the compiler support of __attribute__ extensions.
- # Defines HAVE___ATTRIBUTE__ if it is found.
- #
- # LICENSE
- #
- # Copyright (c) 2008 Stepan Kasal <skasal@redhat.com>
- # Copyright (c) 2008 Christian Haggstrom
- # Copyright (c) 2008 Ryan McCabe <ryan@numb.org>
- #
- # This program is free software; you can redistribute it and/or modify it
- # under the terms of the GNU General Public License as published by the
- # Free Software Foundation; either version 2 of the License, or (at your
- # option) any later version.
- #
- # This program is distributed in the hope that it will be useful, but
- # WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
- # Public License for more details.
- #
- # You should have received a copy of the GNU General Public License along
- # with this program. If not, see <https://www.gnu.org/licenses/>.
- #
- # As a special exception, the respective Autoconf Macro's copyright owner
- # gives unlimited permission to copy, distribute and modify the configure
- # scripts that are the output of Autoconf when processing the Macro. You
- # need not follow the terms of the GNU General Public License when using
- # or distributing such scripts, even though portions of the text of the
- # Macro appear in them. The GNU General Public License (GPL) does govern
- # all other use of the material that constitutes the Autoconf Macro.
- #
- # This special exception to the GPL applies to versions of the Autoconf
- # Macro released by the Autoconf Archive. When you make and distribute a
- # modified version of the Autoconf Macro, you may extend this special
- # exception to the GPL to apply to your modified version as well.
-
- #serial 9
-
- AC_DEFUN([AX_C___ATTRIBUTE__], [
- AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <stdlib.h>
- static void foo(void) __attribute__ ((unused));
- static void
- foo(void) {
- exit(1);
- }
- ]], [])],
- [ax_cv___attribute__=yes],
- [ax_cv___attribute__=no]
- )
- ])
- if test "$ax_cv___attribute__" = "yes"; then
- AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__])
- fi
- ])
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