build: Add Configuration_var.h as a configuration wrapper

Instead of including Configuration_prusa.h directly, include
Configuration_var which then includes the proper variant file though a
preprocessor macro.

This allows to keep the existing build system intact, but also redefine
at compile time the final header without having to make copies on the
file system.

Firmware/Configuration.cpp

@@ -1,5 +1,5 @@
 #include "Configuration.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 const uint16_t _nPrinterType PROGMEM=PRINTER_TYPE;
 const char _sPrinterName[] PROGMEM=PRINTER_NAME;

Firmware/Configuration.h

@@ -70,7 +70,7 @@ extern PGM_P sPrinterName;
 #define SOURCE_TIME_EPOCH __TIME__
 #endif
 
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 #define FW_PRUSA3D_MAGIC "PRUSA3DFW"
 #define FW_PRUSA3D_MAGIC_LEN 10

Firmware/ConfigurationStore.cpp

@@ -5,7 +5,7 @@
 #include "temperature.h"
 #include "ultralcd.h"
 #include "ConfigurationStore.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 #ifdef MESH_BED_LEVELING
 #include "mesh_bed_leveling.h"

Firmware/Configuration_var.h

@@ -0,0 +1,10 @@
+// Include the printer's variant configuration header
+#pragma once
+
+// This is set by the cmake build to be able to take control of
+// the variant header without breaking existing build mechanisms.
+#ifndef CMAKE_CONTROL
+#include "Configuration_prusa.h"
+#else
+#include FW_VARIANT
+#endif

Firmware/config.h

@@ -2,7 +2,7 @@
 #define _CONFIG_H
 
 
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #include "pins.h"
 
 #if (defined(VOLT_IR_PIN) && defined(IR_SENSOR))

Firmware/first_lay_cal.cpp

@@ -4,7 +4,7 @@
 //! @brief First layer (Z offset) calibration
 
 #include "first_lay_cal.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #include "language.h"
 #include "Marlin.h"
 #include "cmdqueue.h"

Firmware/messages.cpp

@@ -1,8 +1,8 @@
 //messages.c
 #include "language.h"
 
-//this is because we need include Configuration_prusa.h (CUSTOM_MENDEL_NAME)
-#include "Configuration_prusa.h"
+//this is because we need CUSTOM_MENDEL_NAME
+#include "Configuration_var.h"
 
 //internationalized messages
 const char MSG_ALWAYS[] PROGMEM_I1 = ISTR("Always"); ////MSG_ALWAYS c=6

Firmware/mmu2_power.cpp

@@ -1,5 +1,5 @@
 #include "mmu2_power.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #include "pins.h"
 #include "fastio.h"
 #include <util/delay.h>

Firmware/pat9125.cpp

@@ -4,7 +4,7 @@
 #include <avr/pgmspace.h>
 #include "config.h"
 #include <stdio.h>
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 #if defined(FILAMENT_SENSOR) && (FILAMENT_SENSOR_TYPE == FSENSOR_PAT9125)
 

Firmware/sm4.c

@@ -9,7 +9,7 @@
 #include "boards.h"
 #define false 0
 #define true 1
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 
 #ifdef NEW_XYZCAL

Firmware/swi2c.c

@@ -4,7 +4,7 @@
 #include <util/delay.h>
 #include <avr/pgmspace.h>
 #include "stdbool.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #include "pins.h"
 #include "fastio.h"
 

Firmware/temperature.cpp

@@ -44,7 +44,7 @@
 #include "adc.h"
 #include "ConfigurationStore.h"
 #include "Timer.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #include "Prusa_farm.h"
 
 #if (ADC_OVRSAMPL != OVERSAMPLENR)

Firmware/tone04.c

@@ -3,7 +3,7 @@
 // timer2 is used for System timer.
 
 #include "system_timer.h"
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 
 #ifdef SYSTEM_TIMER_2
 

Firmware/xyzcal.cpp

@@ -1,6 +1,6 @@
 //xyzcal.cpp - xyz calibration with image processing
 
-#include "Configuration_prusa.h"
+#include "Configuration_var.h"
 #ifdef NEW_XYZCAL
 
 #include "xyzcal.h"