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1 # ===========================================================================
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2 # http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.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_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
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8 #
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9 # DESCRIPTION
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10 #
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11 # Check whether the given compiler FLAGS work with the current language's
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12 # compiler, or whether they give an error. (Warnings, however, are
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13 # ignored.)
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14 #
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15 # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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16 # success/failure.
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17 #
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18 # LICENSE
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19 #
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20 # Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
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21 # Copyright (c) 2009 Matteo Frigo
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22 #
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23 # This program is free software: you can redistribute it and/or modify it
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24 # under the terms of the GNU General Public License as published by the
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25 # Free Software Foundation, either version 3 of the License, or (at your
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26 # option) any later version.
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27 #
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28 # This program is distributed in the hope that it will be useful, but
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29 # WITHOUT ANY WARRANTY; without even the implied warranty of
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30 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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31 # Public License for more details.
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32 #
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33 # You should have received a copy of the GNU General Public License along
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34 # with this program. If not, see <http://www.gnu.org/licenses/>.
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35 #
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36 # As a special exception, the respective Autoconf Macro's copyright owner
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37 # gives unlimited permission to copy, distribute and modify the configure
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38 # scripts that are the output of Autoconf when processing the Macro. You
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39 # need not follow the terms of the GNU General Public License when using
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40 # or distributing such scripts, even though portions of the text of the
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41 # Macro appear in them. The GNU General Public License (GPL) does govern
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42 # all other use of the material that constitutes the Autoconf Macro.
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43 #
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44 # This special exception to the GPL applies to versions of the Autoconf
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45 # Macro released by the Autoconf Archive. When you make and distribute a
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46 # modified version of the Autoconf Macro, you may extend this special
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47 # exception to the GPL to apply to your modified version as well.
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48
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49 #serial 9
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50
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51 AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
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52 [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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53 AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
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54 dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
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55 AS_LITERAL_IF([$1],
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56 [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
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57 ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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58 _AC_LANG_PREFIX[]FLAGS="$1"
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59 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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60 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
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61 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
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62 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
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63 [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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64 _AC_LANG_PREFIX[]FLAGS="$1"
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65 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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66 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
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67 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
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68 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
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69 eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
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70 AC_MSG_RESULT($ax_check_compiler_flags)
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71 if test "x$ax_check_compiler_flags" = xyes; then
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72 m4_default([$2], :)
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73 else
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74 m4_default([$3], :)
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75 fi
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76 ])dnl AX_CHECK_COMPILER_FLAGS
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