Add a caution to drivers.h

thinkyhead · thinkyhead · commit 0b4549355786 · 2020-02-09T21:58:12.000-06:00
diff --git a/Marlin/src/core/drivers.h b/Marlin/src/core/drivers.h
@@ -21,7 +21,10 @@
  */
 #pragma once
 
-#include "../inc/MarlinConfigPre.h"
+//
+// Included by MarlinConfigPre.h ahead of Configuration_adv.h.
+// Don't use #if in this file for anything not defined early!
+//
 
 #define _A4988              0x4988
 #define _A5984              0x5984
