Due to the fix for #1248, X and Y probe offsets must not be floats.

The compiler does not support comparing float values: "error: floating constant in preprocessor expression"
The loss in X/Y precision shouldn't matter for Z probes, as most microswitches or inductive sensors are larger than 1mm square anyway.

Marlin/Configuration.h

 
 
   // these are the offsets to the probe relative to the extruder tip (Hotend - Probe)
+  // X and Y offsets must be integers
   #define X_PROBE_OFFSET_FROM_EXTRUDER -25
   #define Y_PROBE_OFFSET_FROM_EXTRUDER -29
   #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35