re PR c++/27581 (ICE using this-pointer in static member function)

	PR c++/27581
	* search.c (adjust_result_of_qualified_name_lookup): Skip on
	invalid context_class.

	* g++.dg/lookup/this1.C: New test.

From-SVN: r113781

gcc/cp/ChangeLog

 2006-05-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/27581
+	* search.c (adjust_result_of_qualified_name_lookup): Skip on
+	invalid context_class.
+
 	PR c++/27315
 	* pt.c (do_decl_instantiation): Return early on invalid decl.
 

gcc/cp/search.c

@@ -1479,7 +1479,8 @@ adjust_result_of_qualified_name_lookup (tree decl,
 					tree qualifying_scope,
 					tree context_class)
 {
-  if (context_class && CLASS_TYPE_P (qualifying_scope)
+  if (context_class && context_class != error_mark_node
+      && CLASS_TYPE_P (qualifying_scope)
       && DERIVED_FROM_P (qualifying_scope, context_class)
       && BASELINK_P (decl))
     {

gcc/testsuite/ChangeLog

 2006-05-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/27581
+	* g++.dg/lookup/this1.C: New test.
+
 	PR c++/27315
 	* g++.dg/template/operator6.C: New test.
 	* g++.dg/template/incomplete3.C: New test.

gcc/testsuite/g++.dg/lookup/this1.C

+// PR c++/27581
+// { dg-do compile }
+
+struct A
+{
+    template<int> static void foo();
+    static void bar() { this->A::foo<0>(); } // { dg-error "unavailable" }
+};