1 | # =========================================================================== |
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2 | # https://www.gnu.org/software/autoconf-archive/ax_append_flag.html |
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3 | # =========================================================================== |
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4 | # |
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5 | # SYNOPSIS |
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6 | # |
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7 | # AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE]) |
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8 | # |
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9 | # DESCRIPTION |
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10 | # |
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11 | # FLAG is appended to the FLAGS-VARIABLE shell variable, with a space |
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12 | # added in between. |
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13 | # |
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14 | # If FLAGS-VARIABLE is not specified, the current language's flags (e.g. |
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15 | # CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains |
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16 | # FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly |
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17 | # FLAG. |
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18 | # |
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19 | # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. |
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20 | # |
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21 | # LICENSE |
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22 | # |
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23 | # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> |
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24 | # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> |
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25 | # |
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26 | # Copying and distribution of this file, with or without modification, are |
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27 | # permitted in any medium without royalty provided the copyright notice |
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28 | # and this notice are preserved. This file is offered as-is, without any |
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29 | # warranty. |
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30 | |
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31 | #serial 8 |
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32 | |
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33 | AC_DEFUN([AX_APPEND_FLAG], |
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34 | [dnl |
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35 | AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF |
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36 | AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) |
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37 | AS_VAR_SET_IF(FLAGS,[ |
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38 | AS_CASE([" AS_VAR_GET(FLAGS) "], |
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39 | [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])], |
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40 | [ |
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41 | AS_VAR_APPEND(FLAGS,[" $1"]) |
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42 | AC_RUN_LOG([: FLAGS="$FLAGS"]) |
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43 | ]) |
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44 | ], |
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45 | [ |
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46 | AS_VAR_SET(FLAGS,[$1]) |
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47 | AC_RUN_LOG([: FLAGS="$FLAGS"]) |
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48 | ]) |
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49 | AS_VAR_POPDEF([FLAGS])dnl |
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50 | ])dnl AX_APPEND_FLAG |
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51 | |
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