cp-tree.h (struct lang_decl_flags): Add needs_final_overrider.

a
	* cp-tree.h (struct lang_decl_flags): Add needs_final_overrider.
	(DECL_NEEDS_FINAL_OVERRIDER_P): New macro.
	* class.c (override_one_vtable): Set DECL_NEEDS_FINAL_OVERRIDER_P.
	* decl.c (duplicate_decls): Propagate it.
	* typeck2.c (abstract_virtuals_error): Use two loops to emit
	abstract virtual functions and virtual functions which need a
	final overrider separately.

From-SVN: r18587

gcc/cp/cp-tree.h

@@ -969,7 +969,8 @@ struct lang_decl_flags
   unsigned declared_inline : 1;
   unsigned not_really_extern : 1;
   unsigned comdat : 1;
-  unsigned dummy : 4;
+  unsigned needs_final_overrider : 1;
+  unsigned dummy : 3;
 
   tree access;
   tree context;
@@ -1076,6 +1077,10 @@ struct lang_decl
    exists as part of an abstract class's interface.  */
 #define DECL_ABSTRACT_VIRTUAL_P(NODE) (DECL_LANG_SPECIFIC(NODE)->decl_flags.abstract_virtual)
 
+/* Nonzero for FUNCTION_DECL means that this member function
+   must be overridden by derived classes.  */
+#define DECL_NEEDS_FINAL_OVERRIDER_P(NODE) (DECL_LANG_SPECIFIC(NODE)->decl_flags.needs_final_overrider)
+
 /* Nonzero if allocated on permanent_obstack.  */
 #define LANG_DECL_PERMANENT(LANGDECL) ((LANGDECL)->decl_flags.permanent_attr)