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70 lines
2.4 KiB
Text
70 lines
2.4 KiB
Text
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##### http://autoconf-archive.cryp.to/ax_c___attribute__.html
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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__
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# extensions. defines HAVE___ATTRIBUTE__ if it is found.
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#
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# Originating from the 'pork' package by Ryan McCabe <ryan@numb.org>
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#
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# LAST MODIFICATION
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#
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# 2005-01-21
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#
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# COPYLEFT
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#
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# Copyright (c) 2005 Christian Haggstrom <chm@c00.info>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or (at your 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
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# General 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
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# 02111-1307, USA.
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#
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# As a special exception, the respective Autoconf Macro's copyright
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# owner gives unlimited permission to copy, distribute and modify the
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# configure scripts that are the output of Autoconf when processing
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# the Macro. You need not follow the terms of the GNU General Public
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# License when using or distributing such scripts, even though
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# portions of the text of the Macro appear in them. The GNU General
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# Public License (GPL) does govern all other use of the material that
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# constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the
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# Autoconf Macro released by the Autoconf Macro Archive. When you
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# make and distribute a modified version of the Autoconf Macro, you
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# may extend this special exception to the GPL to apply to your
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# modified version as well.
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AC_DEFUN([AX_C___ATTRIBUTE__], [
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AC_MSG_CHECKING(for __attribute__)
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AC_CACHE_VAL(ac_cv___attribute__, [
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AC_TRY_COMPILE(
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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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ac_cv___attribute__=yes,
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ac_cv___attribute__=no
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)])
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if test "$ac_cv___attribute__" = "yes"; then
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AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
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fi
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AC_MSG_RESULT($ac_cv___attribute__)
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])
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