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[babeltrace.git] / m4 / ax_append_flag.m4
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
54 AC_DEFUN([AX_APPEND_FLAG],
55 [dnl
56 AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
57 AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
58 AS_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 ])
70 AS_VAR_POPDEF([FLAGS])dnl
71 ])dnl AX_APPEND_FLAG
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