projects / urcu.git / blame
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| 074c3a1b MJ |
1 | # =========================================================================== |
| 2 | # http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html | |
| 3 | # =========================================================================== | |
| 4 | # | |
| 5 | # SYNOPSIS | |
| 6 | # | |
| 7 | # AX_C___ATTRIBUTE__ | |
| 8 | # | |
| 9 | # DESCRIPTION | |
| 10 | # | |
| 11 | # Provides a test for the compiler support of __attribute__ extensions. | |
| 12 | # Defines HAVE___ATTRIBUTE__ if it is found. | |
| 13 | # | |
| 14 | # LICENSE | |
| 15 | # | |
| 16 | # Copyright (c) 2008 Stepan Kasal <skasal@redhat.com> | |
| 17 | # Copyright (c) 2008 Christian Haggstrom | |
| 18 | # Copyright (c) 2008 Ryan McCabe <ryan@numb.org> | |
| 19 | # | |
| 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. | |
| 24 | # | |
| 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. | |
| 29 | # | |
| 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/>. | |
| 32 | # | |
| 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. | |
| 40 | # | |
| 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. | |
| 45 | ||
| 46 | #serial 8 | |
| 47 | ||
| 48 | AC_DEFUN([AX_C___ATTRIBUTE__], [ | |
| 49 | AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__], | |
| 50 | [AC_COMPILE_IFELSE( | |
| 51 | [AC_LANG_PROGRAM( | |
| 52 | [[#include <stdlib.h> | |
| 53 | static void foo(void) __attribute__ ((unused)); | |
| 54 | static void | |
| 55 | foo(void) { | |
| 56 | exit(1); | |
| 57 | } | |
| 58 | ]], [])], | |
| 59 | [ax_cv___attribute__=yes], | |
| 60 | [ax_cv___attribute__=no] | |
| 61 | ) | |
| 62 | ]) | |
| 63 | if test "$ax_cv___attribute__" = "yes"; then | |
| 64 | AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__]) | |
| 65 | fi | |
| 66 | ]) |