cannam@127: dnl @synopsis AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
cannam@127: dnl @summary check whether FLAGS are accepted by the compiler
cannam@127: dnl @category Misc
cannam@127: dnl
cannam@127: dnl Check whether the given compiler FLAGS work with the current language's
cannam@127: dnl compiler, or whether they give an error.  (Warnings, however, are
cannam@127: dnl ignored.)
cannam@127: dnl
cannam@127: dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
cannam@127: dnl success/failure.
cannam@127: dnl
cannam@127: dnl @version 2005-05-30
cannam@127: dnl @license GPLWithACException
cannam@127: dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
cannam@127: AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
cannam@127: [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
cannam@127: AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
cannam@127: dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
cannam@127: AS_LITERAL_IF([$1],
cannam@127:   [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
cannam@127:       ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
cannam@127:       _AC_LANG_PREFIX[]FLAGS="$1"
cannam@127:       AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
cannam@127:         AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
cannam@127:         AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
cannam@127:       _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
cannam@127:   [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
cannam@127:    _AC_LANG_PREFIX[]FLAGS="$1"
cannam@127:    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
cannam@127:      eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
cannam@127:      eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
cannam@127:    _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
cannam@127: eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)
cannam@127: AC_MSG_RESULT($ax_check_compiler_flags)
cannam@127: if test "x$ax_check_compiler_flags" = xyes; then
cannam@127: 	m4_default([$2], :)
cannam@127: else
cannam@127: 	m4_default([$3], :)
cannam@127: fi
cannam@127: ])dnl AX_CHECK_COMPILER_FLAGS