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# =========================================================================== |
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# https://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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# Copying and distribution of this file, with or without modification, are |
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# permitted in any medium without royalty provided the copyright notice |
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# and this notice are preserved. This file is offered as-is, without any |
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# warranty. |
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|
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#serial 8 |
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|
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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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