re PR c++/26102 ("using Base::member" nonsense)

        PR c++/26102
        * name-lookup.c (do_class_using_decl): Try to find the base even
        if bases_dependent_p.
        * pt.c (type_dependent_expression_p): A USING_DECL is dependent.

        PR c++/19809
        * pt.c (tsubst_friend_function): Set DECL_INITIAL before pushdecl.

From-SVN: r116709

gcc/cp/name-lookup.c

@@ -2824,18 +2824,19 @@ do_class_using_decl (tree scope, tree name)
      class type.  However, if all of the base classes are
      non-dependent, then we can avoid delaying the check until
      instantiation.  */
-  if (!scope_dependent_p && !bases_dependent_p)
+  if (!scope_dependent_p)
     {
       base_kind b_kind;
-      tree binfo;
       binfo = lookup_base (current_class_type, scope, ba_any, &b_kind);
       if (b_kind < bk_proper_base)
 	{
-	  error_not_base_type (scope, current_class_type);
-	  return NULL_TREE;
+	  if (!bases_dependent_p)
+	    {
+	      error_not_base_type (scope, current_class_type);
+	      return NULL_TREE;
+	    }
 	}
-
-      if (!name_dependent_p)
+      else if (!name_dependent_p)
 	{
 	  decl = lookup_member (binfo, name, 0, false);
 	  if (!decl)

gcc/cp/pt.c

@@ -5333,6 +5333,10 @@ tsubst_friend_function (tree decl, tree args)
       else
 	new_friend_result_template_info = NULL_TREE;
 
+      /* Make the init_value nonzero so pushdecl knows this is a defn.  */
+      if (new_friend_is_defn)
+	DECL_INITIAL (new_friend) = error_mark_node;
+
       /* Inside pushdecl_namespace_level, we will push into the
 	 current namespace. However, the friend function should go
 	 into the namespace of the template.  */
@@ -12862,7 +12866,8 @@ type_dependent_expression_p (tree expression)
     return false;
 
   /* An unresolved name is always dependent.  */
-  if (TREE_CODE (expression) == IDENTIFIER_NODE)
+  if (TREE_CODE (expression) == IDENTIFIER_NODE
+      || TREE_CODE (expression) == USING_DECL)
     return true;
 
   /* Some expression forms are never type-dependent.  */

gcc/testsuite/g++.dg/template/friend47.C

+// PR c++/19809
+
+template<int i>
+struct n{
+  friend void foo(){ }		// { dg-error "defin" }
+};
+
+int main(){
+  n<1> n1;
+  n<2> n2;
+}

gcc/testsuite/g++.dg/template/using14.C

+// PR c++/26102
+
+template <class T> struct B1 { int i(); };
+
+struct B2 { int i(); };
+
+template <class T> struct C : public B1<T>, public B2
+{
+  using B2::i;
+  void f()
+  {
+    i();			// should be accepted
+    i.i();			// { dg-error "" }
+  }
+};
+
+int main()
+{
+  C<int> c;
+  c.f();			// { dg-error "instantiated" }
+}