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-rw-r--r--src/m4/ax_check_preproc_flag.m472
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diff --git a/src/m4/ax_check_preproc_flag.m4 b/src/m4/ax_check_preproc_flag.m4
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--- a/src/m4/ax_check_preproc_flag.m4
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-# ===========================================================================
-# http://www.gnu.org/software/autoconf-archive/ax_check_preproc_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
-#
-# DESCRIPTION
-#
-# Check whether the given FLAG works with the current language's
-# preprocessor or gives an error. (Warnings, however, are ignored)
-#
-# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
-# success/failure.
-#
-# If EXTRA-FLAGS is defined, it is added to the preprocessor's default
-# flags when the check is done. The check is thus made with the flags:
-# "CPPFLAGS EXTRA-FLAGS FLAG". This can for example be used to force the
-# preprocessor to issue an error when a bad flag is given.
-#
-# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
-# macro in sync with AX_CHECK_{COMPILE,LINK}_FLAG.
-#
-# LICENSE
-#
-# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-# Copyright (c) 2011 Maarten Bosmans <mkbosmans@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 3 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 2
-
-AC_DEFUN([AX_CHECK_PREPROC_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
-AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
-AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
- ax_check_save_flags=$CPPFLAGS
- CPPFLAGS="$CPPFLAGS $4 $1"
- AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
- [AS_VAR_SET(CACHEVAR,[yes])],
- [AS_VAR_SET(CACHEVAR,[no])])
- CPPFLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
- [m4_default([$2], :)],
- [m4_default([$3], :)])
-AS_VAR_POPDEF([CACHEVAR])dnl
-])dnl AX_CHECK_PREPROC_FLAGS