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# SYNOPSIS
#
# AX_NODIFF_COMPILE_IFELSE(REFERENCE-PROGRAM, TEST-PROGRAM,
# [ACTION-IF-TRUE], [ACTION-IF-FALSE])
#
# DESCRIPTION
#
# Provides a test for the compiler support of __attribute__ extensions.
# Defines HAVE___ATTRIBUTE__ if it is found.
#
# Check that the compilation of both REFERENCE-PROGRAM and
# TEST-PROGRAM succeeds and produces the same warnings. Requires
# that the compiler for the current language was checked for, hence
# do not use this macro in macros looking for a compiler.
#
# LICENSE
#
# Copyright (c) 2011 Andrea Canciani <ranma42@gmail.com>
#
# 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.
#serial 1
AC_DEFUN([AX_NODIFF_COMPILE_IFELSE], [dnl
AC_COMPILE_IFELSE([$1], [dnl
cp conftest.err conftest.err.ref
AC_COMPILE_IFELSE([$2], [dnl
AS_IF([diff conftest.err.ref conftest.err],
[$3], [$4])
])
rm -f conftest.err.ref
])
])
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