* decl.c (xref_tag): Handle attributes between 'class' and name.
	* parse.y (aggr): Likewise.
	* semantics.c (finish_class_definition): Likewise.
	* Makefile.in (EXPECTED): Adjust.
	* cp-tree.h: Declare flag_optional_diags and warn_multichar.
	* decl2.c: Define them.
	(lang_decode_option): Handle them.
	* lang-options.h: Add -foptional-diags.
	* class.c (finish_struct): Don't complain about multiple meanings of
	name if -fno-optional-diags.
	* decl.c (pushdecl_class_level): Likewise.
	* lex.c (real_yylex): Check warn_multichar.

From-SVN: r20994