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f0d8d709 | 1 | # =========================================================================== |
6e5d9dfa | 2 | # https://www.gnu.org/software/autoconf-archive/ax_append_flag.html |
f0d8d709 AM |
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 | # | |
7fcdef32 MJ |
26 | # Copying and distribution of this file, with or without modification, are |
27 | # permitted in any medium without royalty provided the copyright notice | |
28 | # and this notice are preserved. This file is offered as-is, without any | |
29 | # warranty. | |
f0d8d709 | 30 | |
7fcdef32 | 31 | #serial 8 |
f0d8d709 AM |
32 | |
33 | AC_DEFUN([AX_APPEND_FLAG], | |
34 | [dnl | |
35 | AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF | |
36 | AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) | |
37 | AS_VAR_SET_IF(FLAGS,[ | |
38 | AS_CASE([" AS_VAR_GET(FLAGS) "], | |
39 | [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])], | |
40 | [ | |
41 | AS_VAR_APPEND(FLAGS,[" $1"]) | |
42 | AC_RUN_LOG([: FLAGS="$FLAGS"]) | |
43 | ]) | |
44 | ], | |
45 | [ | |
46 | AS_VAR_SET(FLAGS,[$1]) | |
47 | AC_RUN_LOG([: FLAGS="$FLAGS"]) | |
48 | ]) | |
49 | AS_VAR_POPDEF([FLAGS])dnl | |
50 | ])dnl AX_APPEND_FLAG |