cannam@95: dnl @synopsis AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
cannam@95: dnl @summary check whether FLAGS are accepted by the compiler
cannam@95: dnl @category Misc
cannam@95: dnl
cannam@95: dnl Check whether the given compiler FLAGS work with the current language's
cannam@95: dnl compiler, or whether they give an error.  (Warnings, however, are
cannam@95: dnl ignored.)
cannam@95: dnl
cannam@95: dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
cannam@95: dnl success/failure.
cannam@95: dnl
cannam@95: dnl @version 2005-05-30
cannam@95: dnl @license GPLWithACException
cannam@95: dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
cannam@95: AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
cannam@95: [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
cannam@95: AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
cannam@95: dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
cannam@95: AS_LITERAL_IF([$1],
cannam@95:   [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
cannam@95:       ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
cannam@95:       _AC_LANG_PREFIX[]FLAGS="$1"
cannam@95:       AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
cannam@95:         AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
cannam@95:         AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
cannam@95:       _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
cannam@95:   [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
cannam@95:    _AC_LANG_PREFIX[]FLAGS="$1"
cannam@95:    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
cannam@95:      eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
cannam@95:      eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
cannam@95:    _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
cannam@95: eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)
cannam@95: AC_MSG_RESULT($ax_check_compiler_flags)
cannam@95: if test "x$ax_check_compiler_flags" = xyes; then
cannam@95: 	m4_default([$2], :)
cannam@95: else
cannam@95: 	m4_default([$3], :)
cannam@95: fi
cannam@95: ])dnl AX_CHECK_COMPILER_FLAGS