PR c++/17542
	* cp-tree.h (class_key_or_enum_as_string): Declare.
	* error.c (class_key_or_enum): Rename to class_key_or_enum_as_string
	and remove static qualifier.
	* decl.c (shadow_tag): Warn about ignored attributes in class/struct/
	union/enum declaration.
	* g++.dg/ext/attrib18.C: New test.

From-SVN: r89898