Merge patches from bugfix-2.0.x

Marlin/src/inc/Conditionals_LCD.h

@@ -683,6 +683,10 @@
   #define SPI_SPEED SPI_FULL_SPEED
 #endif
 
+#if SERIAL_PORT == -1 || SERIAL_PORT_2 == -1
+  #define HAS_USB_SERIAL 1
+#endif
+
 /**
  * This setting is also used by M109 when trying to calculate
  * a ballpark safe margin to prevent wait-forever situation.

Marlin/src/inc/MarlinConfigPre.h

@@ -37,12 +37,8 @@
 #include "../../Configuration.h"
 
 #ifdef CUSTOM_VERSION_FILE
-  #if defined(__has_include)
-    #if __has_include(XSTR(../../CUSTOM_VERSION_FILE))
-      #include XSTR(../../CUSTOM_VERSION_FILE)
-    #endif
-  #else
-    #include XSTR(../../CUSTOM_VERSION_FILE)
+  #if __has_include(STRINGIFY(../../CUSTOM_VERSION_FILE))
+    #include STRINGIFY(../../CUSTOM_VERSION_FILE)
   #endif
 #endif
 

Marlin/src/inc/SanityCheck.h

@@ -270,6 +270,10 @@
   #error "Replace SLED_PIN with SOL1_PIN (applies to both Z_PROBE_SLED and SOLENOID_PROBE)."
 #elif defined(CONTROLLERFAN_PIN)
   #error "CONTROLLERFAN_PIN is now CONTROLLER_FAN_PIN, enabled with USE_CONTROLLER_FAN. Please update your Configuration_adv.h."
+#elif defined(CONTROLLERFAN_SPEED)
+  #error "CONTROLLERFAN_SPEED is now CONTROLLERFAN_SPEED_ACTIVE. Please update your Configuration_adv.h."
+#elif defined(CONTROLLERFAN_SECS)
+  #error "CONTROLLERFAN_SECS is now CONTROLLERFAN_IDLE_TIME. Please update your Configuration_adv.h."
 #elif defined(MIN_RETRACT)
   #error "MIN_RETRACT is now MIN_AUTORETRACT and MAX_AUTORETRACT. Please update your Configuration_adv.h."
 #elif defined(ADVANCE)
@@ -1983,7 +1987,7 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
 /**
  * Auto Fan check for PWM pins
  */
-#if HAS_AUTO_FAN && EXTRUDER_AUTO_FAN_SPEED != 255
+#if HAS_AUTO_FAN && EXTRUDER_AUTO_FAN_SPEED != 255 && DISABLED(NO_COMPILE_TIME_PWM)
   #define AF_ERR_SUFF "_AUTO_FAN_PIN is not a PWM pin. Set EXTRUDER_AUTO_FAN_SPEED to 255."
   #if HAS_AUTO_FAN_0
     static_assert(PWM_PIN(E0_AUTO_FAN_PIN), "E0" AF_ERR_SUFF);
@@ -2649,14 +2653,14 @@ static_assert(   _ARR_TEST(3,0) && _ARR_TEST(3,1) && _ARR_TEST(3,2)
 #endif
 
 #if ENABLED(BACKLASH_COMPENSATION)
-  #if IS_CORE
-    #error "BACKLASH_COMPENSATION is incompatible with CORE kinematics."
-  #endif
   #ifndef BACKLASH_DISTANCE_MM
     #error "BACKLASH_COMPENSATION requires BACKLASH_DISTANCE_MM"
-  #endif
-  #ifndef BACKLASH_CORRECTION
+  #elif !defined(BACKLASH_CORRECTION)
     #error "BACKLASH_COMPENSATION requires BACKLASH_CORRECTION"
+  #elif IS_CORE
+    constexpr float backlash_arr[] = BACKLASH_DISTANCE_MM;
+    static_assert(!backlash_arr[CORE_AXIS_1] && !backlash_arr[CORE_AXIS_2],
+                  "BACKLASH_COMPENSATION can only apply to " STRINGIFY(NORMAL_AXIS) " with your CORE system.");
   #endif
 #endif
 

Marlin/src/inc/Version.h

@@ -42,7 +42,7 @@
  * version was tagged.
  */
 #ifndef STRING_DISTRIBUTION_DATE
-  #define STRING_DISTRIBUTION_DATE "2020-03-16"
+  #define STRING_DISTRIBUTION_DATE "2020-03-24"
 #endif
 
 /**