PR c++/61339 - add warning for mismatch between struct and class

PR c++/61339 - add warning for mismatch between struct and class

gcc/c-family/ChangeLog:

	PR c++/61339
	* c.opt (-Wmismatched-tags, -Wredundant-tags): New options.

gcc/cp/ChangeLog:

	PR c++/61339
	* parser.c (cp_parser_maybe_warn_enum_key): New function.
	(class_decl_loc_t): New class.
	(cp_parser_elaborated_type_specifier): Call
	cp_parser_maybe_warn_enum_key.
	(cp_parser_class_head): Call cp_parser_check_class_key.
	(cp_parser_check_class_key): Add arguments.  Call class_decl_loc_t::add.
	(c_parse_file): Call class_decl_loc_t::diag_mismatched_tags.

gcc/testsuite/ChangeLog:

	PR c++/61339
	* g++.dg/warn/Wmismatched-tags.C: New test.
	* g++.dg/warn/Wredundant-tags.C: New test.
	* g++.dg/pch/Wmismatched-tags.C: New test.
	* g++.dg/pch/Wmismatched-tags.Hs: New test header.

gcc/ChangeLog:

	PR c++/61339
	* doc/invoke.texi (-Wmismatched-tags, -Wredundant-tags): Document
	new C++ options.

From-SVN: r279480