re PR c++/3656 (ICE when incorrectly deriving a class from a templated base in another namespace)

cp/
        PR C++/3656
        * semantics.c (finish_base_specifier): Handle erronous base
        classes.

testsuite/
        * g++.dg/inherit/template-as-base.C: New test.

From-SVN: r51214

gcc/cp/ChangeLog

+2002-03-21  Gabriel Dos Reis  <gdr@merlin.codesourcery.com>
+
+	PR C++/3656
+	* semantics.c (finish_base_specifier): Handle erronous base
+	classes. 
+
 2002-03-22  Zack Weinberg  <zack@codesourcery.com>
 
 	* error.c: Always use REAL_VALUE_TO_DECIMAL; don't test

gcc/cp/semantics.c

@@ -2026,7 +2026,12 @@ finish_base_specifier (access_specifier, base_class)
 {
   tree result;
 
-  if (! is_aggr_type (base_class, 1))
+  if (base_class == error_mark_node)
+    {
+      error ("invalid base-class specification");
+      result = NULL_TREE;
+    }
+  else if (! is_aggr_type (base_class, 1))
     result = NULL_TREE;
   else
     {

gcc/testsuite/ChangeLog

+2002-03-22  Gabriel Dos Reis  <gdr@merlin.codesourcery.com>
+
+	* g++.dg/inherit/template-as-base.C: New test.
+
 2002-03-22  Jakub Jelinek  <jakub@redhat.com>
 
 	* g++.old-deja/g++.other/dwarf2-1.C: Move...

gcc/testsuite/g++.dg/inherit/template-as-base.C

+// Contributed by Gabriel Dos Reis <gdr@codesourcery.com>
+// Distilled from PR C++/3656
+
+namespace N
+{
+    template<typename> struct X { };
+}
+
+struct A : N::X { };