1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
# ===========================================================================
# 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
])
|
