2011-06-30 02:09:13 -04:00
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
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2011-06-30 02:09:13 -04:00
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_C___ATTRIBUTE__
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#
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# DESCRIPTION
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#
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# Provides a test for the compiler support of __attribute__ extensions.
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# Defines HAVE___ATTRIBUTE__ if it is found.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Stepan Kasal <skasal@redhat.com>
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# Copyright (c) 2008 Christian Haggstrom
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# Copyright (c) 2008 Ryan McCabe <ryan@numb.org>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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2011-06-30 02:09:13 -04:00
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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2017-05-13 17:17:35 -04:00
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#serial 9
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2011-06-30 02:09:13 -04:00
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AC_DEFUN([AX_C___ATTRIBUTE__], [
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AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdlib.h>
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static void foo(void) __attribute__ ((unused));
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static void
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foo(void) {
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exit(1);
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}
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]], [])],
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[ax_cv___attribute__=yes],
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[ax_cv___attribute__=no]
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)
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])
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if test "$ax_cv___attribute__" = "yes"; then
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AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__])
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fi
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])
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