cygwin*)
			CFLAGS="${CFLAGS} -mms-bitfields"
			;;
	esac
])

AC_DEFUN(DC_TEST_WHOLE_ARCHIVE_SHARED_LIB, [

	SAVE_LIBS="${LIBS}"

	LIBS="-Wl,--whole-archive $1 -Wl,--no-whole-archive ${SAVE_LIBS}"
	LIBS="${WHOLEARCHIVE} $1 ${NOWHOLEARCHIVE} ${SAVE_LIBS}"
	AC_LINK_IFELSE(
		AC_LANG_PROGRAM([[
			]], [[
			]]
		),
		[
			LIBS="${SAVE_LIBS}"

	)
])

AC_DEFUN(DC_FIND_TCLKIT_LIBS, [
	DC_SETUP_TCL_PLAT_DEFS

	WISH_CFLAGS=""

	dnl We will need this for the Tcl project, which we will always have
	DC_CHECK_FOR_WHOLE_ARCHIVE

	for proj in tcl tclvfs tk; do
		AC_MSG_CHECKING([for libraries required for ${proj}])

		libdir="../../../${proj}/inst"
		libfiles="`find "${libdir}" -name '*.a' 2>/dev/null | tr "\n" ' '`"
		libfilesnostub="`find "${libdir}" -name '*.a' 2>/dev/null | grep -v 'stub' | tr "\n" ' '`"

			AC_MSG_RESULT([found])
			AC_DEFINE(HAVE_ACCEPTABLE_DLADDR, [1], [Define to 1 if you have an acceptable dladdr implementation with dli_fname])
		], [
			AC_MSG_RESULT([not found])
		]
	)
])

AC_DEFUN(DC_CHECK_FOR_WHOLE_ARCHIVE, [
	AC_MSG_CHECKING([for how to link whole archive])

	SAVE_CFLAGS="${CFLAGS}"

	wholearchive=""

	for check in "-Wl,-z,allextract -Wl,-z,defaultextract" "-Wl,--whole-archive -Wl,--no-whole-archive"; do
		CFLAGS="${SAVE_CFLAGS} ${check}"

		AC_LINK_IFELSE(AC_LANG_PROGRAM([], []),
			[
				wholearchive="${check}"

				break
			]
		)

	done

	CFLAGS="${SAVE_CFLAGS}"

	if test -z "${wholearchive}"; then
		AC_MSG_RESULT([not found])
	else
		AC_MSG_RESULT([${wholearchive}])

		WHOLEARCHIVE=`echo "${wholearchive}" | cut -f 1 -d ' '`
		NOWHOLEARCHIVE=`echo "${wholearchive}" | cut -f 2 -d ' '`
	fi

	AC_SUBST(WHOLEARCHIVE)
	AC_SUBST(NOWHOLEARCHIVE)
])