re PR c++/70522 (Hidden friend functions block qualified name lookup into nested unnamed namespace)

	PR c++/70522

	* name-lookup.c (qualified_lookup_using_namespace): Look through
	hidden names.

From-SVN: r235206

gcc/cp/ChangeLog

+2016-04-19  Jason Merrill  <jason@redhat.com>
+
+	PR c++/70522
+	* name-lookup.c (qualified_lookup_using_namespace): Look through
+	hidden names.
+
 2016-04-18  Michael Matz  <matz@suse.de>
 
 	* class.c (build_vtable): Use SET_DECL_ALIGN and SET_TYPE_ALIGN.

gcc/cp/name-lookup.c

@@ -4647,8 +4647,9 @@ qualified_lookup_using_namespace (tree name, tree scope,
 	    cp_binding_level_find_binding_for_name (NAMESPACE_LEVEL (scope), name);
 	  if (binding)
 	    {
-	      found_here = true;
 	      ambiguous_decl (result, binding, flags);
+	      if (result->type || result->value)
+		found_here = true;
 	    }
 
 	  for (usings = DECL_NAMESPACE_USING (scope); usings;

gcc/testsuite/g++.dg/lookup/friend18.C

+// PR c++/70522
+
+namespace A {
+  struct C {
+    friend void i();
+  };
+  namespace {
+    int i;
+  }
+}
+
+int main()
+{
+  return A::i;
+}