PR c++/61414
	* c-attribs.c (handle_mode_attribute): Add mode attribute to
	ENUMERAL_TYPEs.

	* class.c (enum_to_min_precision): New hash_map.
	(enum_min_precision): New function.
	(check_bitfield_decl): Use it.

	* g++.dg/cpp0x/enum23.C: Remove xfail.
	* g++.dg/cpp0x/enum28.C: New test.

From-SVN: r278736