re PR c++/31941 ("confused by earlier errors" message without earlier error message)

	PR c++/31941
	* error.c (resolve_virtual_fun_from_obj_type_ref): Handle
	TARGET_VTABLE_USES_DESCRIPTORS targets properly.

	* g++.dg/parse/crash37.C: New test.

From-SVN: r127747

gcc/cp/ChangeLog

+2007-08-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/31941
+	* error.c (resolve_virtual_fun_from_obj_type_ref): Handle
+	TARGET_VTABLE_USES_DESCRIPTORS targets properly.
+
 2007-08-22  Jason Merrill  <jason@redhat.com>
 
 	PR c++/29365

gcc/cp/error.c

@@ -1438,10 +1438,14 @@ static tree
 resolve_virtual_fun_from_obj_type_ref (tree ref)
 {
   tree obj_type = TREE_TYPE (OBJ_TYPE_REF_OBJECT (ref));
-  int index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
+  HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
   tree fun = BINFO_VIRTUALS (TYPE_BINFO (TREE_TYPE (obj_type)));
-    while (index--)
+  while (index)
+    {
       fun = TREE_CHAIN (fun);
+      index -= (TARGET_VTABLE_USES_DESCRIPTORS
+		? TARGET_VTABLE_USES_DESCRIPTORS : 1);
+    }
 
   return BV_FN (fun);
 }

gcc/testsuite/ChangeLog

+2007-08-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/31941
+	* g++.dg/parse/crash37.C: New test.
+
 2007-08-23  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/17390

gcc/testsuite/g++.dg/parse/crash37.C

+// PR c++/31941
+// { dg-do compile }
+
+struct S
+{
+  S() throw () { }
+  virtual ~S () throw ();
+  virtual const char* what () const throw ();
+};
+
+const char *
+foo (S &e)
+{
+  return e.what ().c_str ();	// { dg-error "c_str.*S::what.*which is of non-class type" }
+}