re PR c++/14324 (Multiple static definitions are not unique)

re PR c++/14324 (Multiple static definitions are not unique)

	PR c++/14324
	* lex.c (retrofit_lang_decl): Treat entities with no linkage as
	having C++ linkage for name-mangling purposes.

	PR c++/14260
	* parser.c (cp_parser_direct_declarator): Recognize constructor
	declarators that use a template-id to name the class being
	constructed.

	PR c++/14337
	* pt.c (tsubst_qualified_id): Handle dependent qualifying scopes.
	(tsubst_expr): Do not call tsubst_copy, even when
	processing_template_decl.

	PR c++/14324
	* g++.dg/abi/mangle21.C: New test.

	PR c++/14260
	* g++.dg/parse/constructor2.C: New test.

	PR c++/14337
	* g++.dg/template/sfinae1.C: New test.

From-SVN: r78720