41 lines
1.6 KiB
Plaintext
41 lines
1.6 KiB
Plaintext
dnl @synopsis AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
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dnl @summary check whether FLAGS are accepted by the compiler
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dnl @category Misc
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dnl
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dnl Check whether the given compiler FLAGS work with the current language's
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dnl compiler, or whether they give an error. (Warnings, however, are
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dnl ignored.)
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dnl
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dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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dnl success/failure.
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dnl
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dnl @version 2005-05-30
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dnl @license GPLWithACException
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dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
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AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
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[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
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dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
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AS_LITERAL_IF([$1],
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[AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
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ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
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AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
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_AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
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[ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
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eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
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_AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
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eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)
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AC_MSG_RESULT($ax_check_compiler_flags)
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if test "x$ax_check_compiler_flags" = xyes; then
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m4_default([$2], :)
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else
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m4_default([$3], :)
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fi
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])dnl AX_CHECK_COMPILER_FLAGS
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