* decl2.c (determine_visibility): Make anonymous types internal.
	(mark_used): Complain about types without linkage used in
	decls with internal linkage.
	(vague_linkage_fn_p): Split out from...
	* decl.c (maybe_commonize_var): ...here.
	(grokdeclarator): Adjust linkage when a typedef gives linkage name.
	* tree.c (no_linkage_check): Check the enclosing class and template
	arguments.

	* cp-tree.h (TYPE_NAMESPACE_SCOPE_P): New.

From-SVN: r151868