source: trunk/m4/ax_append_flag.m4 @ 2724

Last change on this file since 2724 was 2724, checked in by Peter, 7 years ago

set svncopyright:ignore property

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Date
File size: 2.7 KB
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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 2
53
54AC_DEFUN([AX_APPEND_FLAG],
55[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
56AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])dnl
57AS_VAR_SET_IF(FLAGS,
58  [case " AS_VAR_GET(FLAGS) " in
59    *" $1 "*)
60      AC_RUN_LOG([: FLAGS already contains $1])
61      ;;
62    *)
63      AC_RUN_LOG([: FLAGS="$FLAGS $1"])
64      AS_VAR_SET(FLAGS, ["AS_VAR_GET(FLAGS) $1"])
65      ;;
66   esac],
67  [AS_VAR_SET(FLAGS,["$1"])])
68AS_VAR_POPDEF([FLAGS])dnl
69])dnl AX_APPEND_FLAG
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