Bug: https://bugs.gentoo.org/show_bug.cgi?id=619782
Upstream commit: http://bazaar.launchpad.net/~lightdm-gtk-greeter-team/lightdm-gtk-greeter/trunk/revision/349

--- a/src/lightdm-gtk-greeter.c
+++ b/src/lightdm-gtk-greeter.c
@@ -677,6 +677,9 @@
 
 /* Clock */
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+
 static gboolean
 clock_timeout_thread (void)
 {
@@ -697,6 +700,8 @@
     return TRUE;
 }
 
+#pragma GCC diagnostic pop
+
 /* Message label */
 
 static gboolean