| # =========================================================================== |
| # http://www.nongnu.org/autoconf-archive/ax_gcc_warn_unused_result.html |
| # =========================================================================== |
| # |
| # SYNOPSIS |
| # |
| # AX_GCC_WARN_UNUSED_RESULT |
| # |
| # DESCRIPTION |
| # |
| # The macro will compile a test program to see whether the compiler does |
| # understand the per-function postfix pragma. |
| # |
| # LICENSE |
| # |
| # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> |
| # |
| # 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 <http://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. |
| |
| AC_DEFUN([AX_GCC_WARN_UNUSED_RESULT],[dnl |
| AC_CACHE_CHECK( |
| [whether the compiler supports function __attribute__((__warn_unused_result__))], |
| ax_cv_gcc_warn_unused_result,[ |
| AC_TRY_COMPILE([__attribute__((__warn_unused_result__)) |
| int f(int i) { return i; }], |
| [], |
| ax_cv_gcc_warn_unused_result=yes, ax_cv_gcc_warn_unused_result=no)]) |
| if test "$ax_cv_gcc_warn_unused_result" = yes; then |
| AC_DEFINE([GCC_WARN_UNUSED_RESULT],[__attribute__((__warn_unused_result__))], |
| [most gcc compilers know a function __attribute__((__warn_unused_result__))]) |
| fi |
| ]) |