re PR c++/11667 (wider-than-int enums never compare equal to 0)

	PR c++/11667
	* c-common.c (shorten_compare): Take into account differences
	between C and C++ representation for enumeration types.
	* tree.h (set_min_and_max_values_for_integral_type): Declare.
	* stor-layout.c (set_min_and_max_values_for_integral_type): New
	function, broken out from ...
	(fixup_signed_type): ... here and ...
	(fixup_unsigned_type): ... here.

	PR c++/11667
	* call.c (standard_conversion): Allow all integral->enumeral
	conversions, after marking them as bad.
	* decl.c (finish_enum): Make sure that all enumerators are
	properly converted to the underlying type.
	(build_enumerator): Set DECL_CONTEXT for namespace-scope
	enumeration types.
	* pt.c (tsubst_copy): Adjust handling of CONST_DECLs accordingly.
	(tsubst_enum): Tidy.

	* Make-lang.in (typeck.o): Depend on convert.h.
	(class.o): Likewise.
	(rtti.o): Likewise.
	* call.c: Include convert.h.
	(convert_arg_to_ellipsis): Use convert_to_real.
	* class.c: Include convert.h.
	(build_base_path): Use convert_to_integer.
	* rtti.c: Include convert.h.
	(build_headof): Use convert_to_integer.
	* typeck.c: Include convert.h.
	(decay_conversion): Use convert_to_integer.
	(build_unary_op): Use build_nop.
	(get_delta_difference): Use convert_to_integer.
	(build_ptrmemfunc): Avoid unncessary conversions.

From-SVN: r69909