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-rw-r--r--tools/m4/ax_append_flag.m471
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diff --git a/tools/m4/ax_append_flag.m4 b/tools/m4/ax_append_flag.m4
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--- a/tools/m4/ax_append_flag.m4
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-# ===========================================================================
-# https://www.gnu.org/software/autoconf-archive/ax_append_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
-#
-# DESCRIPTION
-#
-# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
-# added in between.
-#
-# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
-# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
-# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
-# FLAG.
-#
-# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
-#
-# 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 <https://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 7
-
-AC_DEFUN([AX_APPEND_FLAG],
-[dnl
-AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
-AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
-AS_VAR_SET_IF(FLAGS,[
- AS_CASE([" AS_VAR_GET(FLAGS) "],
- [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
- [
- AS_VAR_APPEND(FLAGS,[" $1"])
- AC_RUN_LOG([: FLAGS="$FLAGS"])
- ])
- ],
- [
- AS_VAR_SET(FLAGS,[$1])
- AC_RUN_LOG([: FLAGS="$FLAGS"])
- ])
-AS_VAR_POPDEF([FLAGS])dnl
-])dnl AX_APPEND_FLAG