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author | Peter Simons <simons@cryp.to> | 2007-02-18 23:43:16 +0100 |
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committer | Peter Simons <simons@cryp.to> | 2007-02-18 23:43:16 +0100 |
commit | 16aee45643e593e2833e4dff19df7b5f14267a79 (patch) | |
tree | ba40c1ee401bbbcec7dbee5e3bb51d21c70db130 /m4/ax_gcc_warn_unused_result.m4 | |
download | autoconf-archive-16aee45643e593e2833e4dff19df7b5f14267a79.tar.gz |
Imported http://autoconf-archive.cryp.to/ release 2007-02-14.
Diffstat (limited to 'm4/ax_gcc_warn_unused_result.m4')
-rw-r--r-- | m4/ax_gcc_warn_unused_result.m4 | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/m4/ax_gcc_warn_unused_result.m4 b/m4/ax_gcc_warn_unused_result.m4 new file mode 100644 index 0000000..155f18c --- /dev/null +++ b/m4/ax_gcc_warn_unused_result.m4 @@ -0,0 +1,62 @@ +##### http://autoconf-archive.cryp.to/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. +# +# LAST MODIFICATION +# +# 2006-08-10 +# +# COPYLEFT +# +# Copyright (c) 2006 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, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA +# 02111-1307, USA. +# +# 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 Macro 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 +]) |