* cp-tree.h (empty_except_spec): New global var.
	(compexcepttypes): Remove prototype.
	(comp_except_specs): Prototype new global function.
	(add_exception_specifier): Prototype new global function.
	* decl.c (empty_except_spec): Define new global var.
	(duplicate_decls): Use comp_except_specs, reword error message.
	(init_decl_processing): Initialize empty_except_spec.
	Adjust build_exception_variant calls.
	* parse.y (exception_specification_opt): Use empty_except_spec.
	(ansi_raise_identifier): Call check_for_new_type.
	(ansi_raise_identifiers): Use add_exception_specifier.
	* pt.c (tsubst): Use add_exception_specifier to build exception
	specifier.
	* search.c (check_final_overrider): New static function, broken
	out of get_matching_virtual. Check throw specifiers, reword
	diagnostics.
	(get_matching_virtual): Use check_final_overrider.
	* tree.c (build_exception_variant): Use comp_except_specs.
	* typeck.c (compexcepttypes): Remove.
	(comp_except_types): New static function, helper for
	comp_except_specs. Compare two types as exception specifiers.
	(comp_except_specs): New global function, compare two exception
	specifiers.
	(comptypes): Adjust for comp_except_specs.
	* typeck2.c (add_exception_specifier): New global function.

	* class.c (check_for_override): Reword error message.

From-SVN: r28494