re PR c++/47957 (Type mismatch when a class derived a same name with template parameter)

PR c++/47957

gcc/cp/

	* name-lookup.c (binding_to_template_parms_of_scope_p): Only
	consider scopes of primary template definitions.  Adjust comments.

gcc/testsuite/

	* g++.dg/lookup/template3.C: New test.

From-SVN: r170779

gcc/cp/ChangeLog

+2011-03-08  Dodji Seketeli  <dodji@redhat.com>
+
+	* name-lookup.c (binding_to_template_parms_of_scope_p): Only
+	consider scopes of primary template definitions.  Adjust comments.
+
 2011-03-07  Jason Merrill  <jason@redhat.com>
 
 	PR c++/48003

gcc/cp/name-lookup.c

@@ -4205,8 +4205,13 @@ qualified_lookup_using_namespace (tree name, tree scope,
 }
 
 /* Subroutine of outer_binding.
-   Returns TRUE if BINDING is a binding to a template parameter of SCOPE,
-   FALSE otherwise.  */
+
+   Returns TRUE if BINDING is a binding to a template parameter of
+   SCOPE.  In that case SCOPE is the scope of a primary template
+   parameter -- in the sense of G++, i.e, a template that has its own
+   template header.
+
+   Returns FALSE otherwise.  */
 
 static bool
 binding_to_template_parms_of_scope_p (cxx_binding *binding,
@@ -4222,6 +4227,8 @@ binding_to_template_parms_of_scope_p (cxx_binding *binding,
   return (scope
 	  && scope->this_entity
 	  && get_template_info (scope->this_entity)
+	  && PRIMARY_TEMPLATE_P (TI_TEMPLATE
+				 (get_template_info (scope->this_entity)))
 	  && parameter_of_template_p (binding_value,
 				      TI_TEMPLATE (get_template_info \
 						    (scope->this_entity))));

gcc/testsuite/ChangeLog

+2011-03-08  Dodji Seketeli  <dodji@redhat.com>
+
+	* g++.dg/lookup/template3.C: New test.
+
 2011-03-08  Kai Tietz  <ktietz@redhat.com>
 
 	* g++.dg/tree-ssa/pr21082.C: Use __INTPTR_TYPE__ instead of

gcc/testsuite/g++.dg/lookup/template3.C

+// Origin PR c++/47957
+// { dg-do compile }
+
+struct S
+{
+  int m;
+
+  S()
+    : m(0)
+  {
+  }
+};
+
+struct Base
+{
+  typedef S T;
+};
+
+template<class T>
+struct Derived : public Base
+{
+  int
+  foo()
+  {
+    T a; // This is Base::T, not the template parameter.
+    return a.m;
+  }
+};
+
+int
+main()
+{
+  Derived<char> d;
+  return d.foo();
+}