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72 lines
2.7 KiB
72 lines
2.7 KiB
9 years ago
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
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#
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# DESCRIPTION
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#
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# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
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# added in between.
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#
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# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
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# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
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# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
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# FLAG.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 6
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AC_DEFUN([AX_APPEND_FLAG],
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[dnl
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AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
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AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
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AS_VAR_SET_IF(FLAGS,[
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AS_CASE([" AS_VAR_GET(FLAGS) "],
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[*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
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[
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AS_VAR_APPEND(FLAGS,[" $1"])
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AC_RUN_LOG([: FLAGS="$FLAGS"])
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])
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],
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[
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AS_VAR_SET(FLAGS,[$1])
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AC_RUN_LOG([: FLAGS="$FLAGS"])
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])
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AS_VAR_POPDEF([FLAGS])dnl
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])dnl AX_APPEND_FLAG
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