Update autoconf archive macros
[babeltrace.git] / m4 / ax_append_flag.m4
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8a87cdbd 1# SPDX-License-Identifier: FSFAP
f0d8d709 2# ===========================================================================
6e5d9dfa 3# https://www.gnu.org/software/autoconf-archive/ax_append_flag.html
f0d8d709
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4# ===========================================================================
5#
6# SYNOPSIS
7#
8# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
9#
10# DESCRIPTION
11#
12# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
13# added in between.
14#
15# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
16# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
17# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
18# FLAG.
19#
20# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
21#
22# LICENSE
23#
24# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
25# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
26#
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27# Copying and distribution of this file, with or without modification, are
28# permitted in any medium without royalty provided the copyright notice
29# and this notice are preserved. This file is offered as-is, without any
30# warranty.
f0d8d709 31
7fcdef32 32#serial 8
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33
34AC_DEFUN([AX_APPEND_FLAG],
35[dnl
36AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
37AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
38AS_VAR_SET_IF(FLAGS,[
39 AS_CASE([" AS_VAR_GET(FLAGS) "],
40 [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
41 [
42 AS_VAR_APPEND(FLAGS,[" $1"])
43 AC_RUN_LOG([: FLAGS="$FLAGS"])
44 ])
45 ],
46 [
47 AS_VAR_SET(FLAGS,[$1])
48 AC_RUN_LOG([: FLAGS="$FLAGS"])
49 ])
50AS_VAR_POPDEF([FLAGS])dnl
51])dnl AX_APPEND_FLAG
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