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# ==============================================================================
# https://www.gnu.org/software/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>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 10
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_COMPILE_IFELSE([AC_LANG_PROGRAM([[__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
])
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