decl.c (copy_args_p): Handle copy elision for types with virtual bases.

	* decl.c (copy_args_p): Handle copy elision for types with virtual
 	bases.
  	* call.c (build_over_call): Likewise.

From-SVN: r17022

gcc/cp/ChangeLog

+Mon Dec  8 23:17:13 1997  Jason Merrill  <jason@yorick.cygnus.com>
+
+	* decl.c (copy_args_p): Handle copy elision for types with virtual
+ 	bases.
+  	* call.c (build_over_call): Likewise.
+
 Sun Dec  7 22:38:12 1997  Mark Mitchell  <mmitchell@usa.net>
 
 	* pt.c (lookup_template_function): Copy the template arguments,

gcc/cp/call.c

@@ -5502,7 +5502,10 @@ build_over_call (fn, convs, args, flags)
       && copy_args_p (fn))
     {
       tree targ;
-      arg = TREE_VALUE (TREE_CHAIN (converted_args));
+      arg = TREE_CHAIN (converted_args);
+      if (TYPE_USES_VIRTUAL_BASECLASSES (DECL_CONTEXT (fn)))
+	arg = TREE_CHAIN (arg);
+      arg = TREE_VALUE (arg);
 
       /* Pull out the real argument, disregarding const-correctness.  */
       targ = arg;

gcc/cp/decl.c

@@ -10280,6 +10280,9 @@ copy_args_p (d)
      tree d;
 {
   tree t = FUNCTION_ARG_CHAIN (d);
+  if (DECL_CONSTRUCTOR_P (d)
+      && TYPE_USES_VIRTUAL_BASECLASSES (DECL_CONTEXT (d)))
+    t = TREE_CHAIN (t);
   if (t && TREE_CODE (TREE_VALUE (t)) == REFERENCE_TYPE
       && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (t)))
 	  == DECL_CLASS_CONTEXT (d))