re PR c++/56243 (ICE in tree check: expected field_decl, have identifier_node in…

re PR c++/56243 (ICE in tree check: expected field_decl, have identifier_node in fixed_type_or_null, at cp/class.c:6645)

	PR c++/56243
	* call.c (build_over_call): Avoid virtual lookup in a template.

From-SVN: r196343

gcc/cp/ChangeLog

+2013-02-28  Jason Merrill  <jason@redhat.com>
+
+	PR c++/56243
+	* call.c (build_over_call): Avoid virtual lookup in a template.
+
 2013-02-27  Jason Merrill  <jason@redhat.com>
 
 	PR c++/56358

gcc/cp/call.c

@@ -7033,7 +7033,10 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
   if (!already_used)
     mark_used (fn);
 
-  if (DECL_VINDEX (fn) && (flags & LOOKUP_NONVIRTUAL) == 0)
+  if (DECL_VINDEX (fn) && (flags & LOOKUP_NONVIRTUAL) == 0
+      /* Don't mess with virtual lookup in fold_non_dependent_expr; virtual
+	 functions can't be constexpr.  */
+      && !in_template_function ())
     {
       tree t;
       tree binfo = lookup_base (TREE_TYPE (TREE_TYPE (argarray[0])),

gcc/testsuite/g++.dg/template/virtual4.C

+// PR c++/56243
+
+struct A
+{
+  virtual int String ();
+};
+
+struct F: A { };
+
+struct G
+{
+  F value;
+};
+
+struct D
+{
+  template <int>
+  void Verify()
+  {
+    G x;
+    F& name = x.value;
+    name.String();
+  }
+};
+
+int main()
+{
+  D d;
+  d.Verify<42>();
+}