From cfca07852a8cfa5f15527b19d60093641f3063d4 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Mon, 20 May 2019 21:34:23 -0500
Subject: [PATCH] Backlash linker error workaround

Fix #14045
---
 Marlin/src/feature/backlash.cpp | 11 ++++++++---
 Marlin/src/feature/backlash.h   | 14 ++++++++------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/Marlin/src/feature/backlash.cpp b/Marlin/src/feature/backlash.cpp
index 67a4afb326..56701991e0 100644
--- a/Marlin/src/feature/backlash.cpp
+++ b/Marlin/src/feature/backlash.cpp
@@ -29,11 +29,16 @@
 #include "../module/motion.h"
 #include "../module/planner.h"
 
-#if ENABLED(BACKLASH_GCODE)
-  uint8_t Backlash::correction = (BACKLASH_CORRECTION) * 0xFF;
-  #ifdef BACKLASH_DISTANCE_MM
+#ifdef BACKLASH_DISTANCE_MM
+  #if ENABLED(BACKLASH_GCODE)
     float Backlash::distance_mm[XYZ] = BACKLASH_DISTANCE_MM;
+  #else
+    const float Backlash::distance_mm[XYZ] = BACKLASH_DISTANCE_MM;
   #endif
+#endif
+
+#if ENABLED(BACKLASH_GCODE)
+  uint8_t Backlash::correction = (BACKLASH_CORRECTION) * 0xFF;
   #ifdef BACKLASH_SMOOTHING_MM
     float Backlash::smoothing_mm = BACKLASH_SMOOTHING_MM;
   #endif
diff --git a/Marlin/src/feature/backlash.h b/Marlin/src/feature/backlash.h
index d1e1e63208..f2dffe1311 100644
--- a/Marlin/src/feature/backlash.h
+++ b/Marlin/src/feature/backlash.h
@@ -26,11 +26,16 @@
 
 class Backlash {
 public:
-  #if ENABLED(BACKLASH_GCODE)
-    static uint8_t correction;
-    #ifdef BACKLASH_DISTANCE_MM
+  #ifdef BACKLASH_DISTANCE_MM
+    #if ENABLED(BACKLASH_GCODE)
       static float distance_mm[XYZ];
+    #else
+      static const float distance_mm[XYZ];
+      //static constexpr float distance_mm[XYZ] = BACKLASH_DISTANCE_MM; // compiler barks at this
     #endif
+  #endif
+  #if ENABLED(BACKLASH_GCODE)
+    static uint8_t correction;
     #ifdef BACKLASH_SMOOTHING_MM
       static float smoothing_mm;
     #endif
@@ -38,9 +43,6 @@ public:
     static inline float get_correction() { return float(ui8_to_percent(correction)) / 100.0f; }
   #else
     static constexpr uint8_t correction = (BACKLASH_CORRECTION) * 0xFF;
-    #ifdef BACKLASH_DISTANCE_MM
-      static constexpr float distance_mm[XYZ] = BACKLASH_DISTANCE_MM;
-    #endif
     #ifdef BACKLASH_SMOOTHING_MM
       static constexpr float smoothing_mm = BACKLASH_SMOOTHING_MM;
     #endif