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[babeltrace.git] / m4 / ax_append_flag.m4
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1# ===========================================================================
2# http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
8#
9# DESCRIPTION
10#
11# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
12# added in between.
13#
14# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
15# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
16# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
17# FLAG.
18#
19# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
20#
21# LICENSE
22#
23# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
24# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
25#
26# This program is free software: you can redistribute it and/or modify it
27# under the terms of the GNU General Public License as published by the
28# Free Software Foundation, either version 3 of the License, or (at your
29# option) any later version.
30#
31# This program is distributed in the hope that it will be useful, but
32# WITHOUT ANY WARRANTY; without even the implied warranty of
33# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
34# Public License for more details.
35#
36# You should have received a copy of the GNU General Public License along
37# with this program. If not, see <http://www.gnu.org/licenses/>.
38#
39# As a special exception, the respective Autoconf Macro's copyright owner
40# gives unlimited permission to copy, distribute and modify the configure
41# scripts that are the output of Autoconf when processing the Macro. You
42# need not follow the terms of the GNU General Public License when using
43# or distributing such scripts, even though portions of the text of the
44# Macro appear in them. The GNU General Public License (GPL) does govern
45# all other use of the material that constitutes the Autoconf Macro.
46#
47# This special exception to the GPL applies to versions of the Autoconf
48# Macro released by the Autoconf Archive. When you make and distribute a
49# modified version of the Autoconf Macro, you may extend this special
50# exception to the GPL to apply to your modified version as well.
51
52#serial 6
53
54AC_DEFUN([AX_APPEND_FLAG],
55[dnl
56AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
57AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
58AS_VAR_SET_IF(FLAGS,[
59 AS_CASE([" AS_VAR_GET(FLAGS) "],
60 [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
61 [
62 AS_VAR_APPEND(FLAGS,[" $1"])
63 AC_RUN_LOG([: FLAGS="$FLAGS"])
64 ])
65 ],
66 [
67 AS_VAR_SET(FLAGS,[$1])
68 AC_RUN_LOG([: FLAGS="$FLAGS"])
69 ])
70AS_VAR_POPDEF([FLAGS])dnl
71])dnl AX_APPEND_FLAG
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