re PR c++/8031 (ICE in comptypes, at cp/typeck.c:913)

PR C++/8031
* cvt.c (convert_to_pointer_force): Don't try comparing	against
erronous type.

From-SVN: r60106

gcc/cp/ChangeLog

+2002-12-13  Gabriel Dos Reis  <gdr@integrable-solutions.net>
+
+	PR C++/8031
+	* cvt.c (convert_to_pointer_force): Don't try comparing against 
+	erronous type.
+
 2002-12-13  Geoffrey Keating  <geoffk@apple.com>
 
 	* cp-tree.h: Have the multiple-include guards around

gcc/cp/cvt.c

@@ -322,6 +322,8 @@ convert_to_pointer_force (type, expr)
 	  if (binfo)
 	    {
 	      expr = build_base_path (code, expr, binfo, 0);
+              if (expr == error_mark_node)
+                 return error_mark_node;
 	      /* Add any qualifier conversions.  */
 	      if (!same_type_p (TREE_TYPE (TREE_TYPE (expr)),
 				TREE_TYPE (type)))

gcc/testsuite/g++.dg/conversion/to-virtual-base-1.C

+// Copyright (C) 2002 Free Software Foundation
+// Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
+
+struct A {
+  virtual void f(const A* a) = 0;
+};
+
+struct B : virtual A {
+  virtual void f(const A* a);
+};
+
+void B::f(const A* a)
+{
+  static_cast<const B&>(*a);             // { dg-error "" }
+}