decl2.c (build_anon_union_vars): Don't crash on empty sub-unions.

1998-05-25  Mark Mitchell  <mark@markmitchell.com>
	* decl2.c (build_anon_union_vars): Don't crash on empty sub-unions.
	* cp-tree.h (processing_template_parmlist): Declare.
	* decl.c (pushtag): Don't call push_template_decl when we
	shouldn't.
	* pt.c (processing_template_parmlist): New variable.
	(TMPL_ARGS_HAVE_MULTIPLE_LEVELS): New macro.
	(complete_template_args): Use it.
	(add_to_template_args): Likewise.
	(innermost_args): Likewise.
	(tsubst): Likewise.
	(begin_template_parm_list): Use processing_template_parmlist.
	(end_template_parm_list): Likewise.
	* cp-tree.h (ANON_UNION_TYPE_P): New macro.
	* decl.c (grokdeclarator): Use it.
	* decl2.c (grok_x_components): Likewise.
	* init.c (initializing_context): Likewise.
	* method.c (do_build_copy_constructor): Likewise.
	(do_build_assign_ref): Likewise.
	* search.c (compute_access): Likewise.
	* typeck.c (build_component_ref): Likewise.
	* decl.c (grokdeclarator): Don't give a cv-qualified version of an
	unnamed type a typedef name "for linkage purposes".
	* pt.c (lookup_template_class): Don't look at
	IDENTIFIER_CLASS_VALUE when there's no current_class_type.
	* method.c (build_overload_int): Handle error cases gracefully.
	* pt.c (instantiate_decl): Handle static member variables
	correctly.
	* pt.c (tsubst): Use the tsubst'd type when producing new
	TEMPLATE_PARM_INDEX nodes.

From-SVN: r20045