Ensure Temperature.c and TWI_AVR8.c can be compiled silently in projects with non-supported hardware - produce errors only if the user application includes the module header files.

LUFA/Drivers/Board/Temperature.c

@@ -28,8 +28,11 @@
   this software.
 */
 
+#define  __INCLUDE_FROM_TEMPERATURE_C
 #include "Temperature.h"
 
+#if defined(TEMPERATURE_SENSOR_DRIVER_COMPATIBLE)
+
 static const uint16_t PROGMEM Temperature_Lookup[TEMP_TABLE_SIZE] =
 {
 	0x3B4, 0x3B0, 0x3AB, 0x3A6, 0x3A0, 0x39A, 0x394, 0x38E, 0x388, 0x381, 0x37A, 0x373,
@@ -60,3 +63,4 @@ int8_t Temperature_GetTemperature(void)
 	return TEMP_MAX_TEMP;
 }
 
+#endif

LUFA/Drivers/Board/Temperature.h

@@ -69,16 +69,22 @@
 
 	/* Includes: */
 		#include "../../Common/Common.h"
-		#include "../Peripheral/ADC.h"
 
-		#if (BOARD == BOARD_NONE)
-			#error The Board Temperature Sensor driver cannot be used if the makefile BOARD option is not set.
-		#elif ((BOARD != BOARD_USBKEY) && (BOARD != BOARD_STK525) && \
-		       (BOARD != BOARD_STK526) && (BOARD != BOARD_USER) &&   \
-			   (BOARD != BOARD_EVK527))
+	/* Preprocessor Checks: */
+		#if ((BOARD == BOARD_USBKEY) || (BOARD == BOARD_STK525) || \
+		     (BOARD == BOARD_STK526) || (BOARD == BOARD_EVK527))
+			#define TEMPERATURE_SENSOR_DRIVER_COMPATIBLE
+		#endif
+		
+		#if !defined(__INCLUDE_FROM_TEMPERATURE_C) && !defined(TEMPERATURE_SENSOR_DRIVER_COMPATIBLE)
 			#error The selected board does not contain a compatible temperature sensor.
 		#endif
 
+	#if defined(TEMPERATURE_SENSOR_DRIVER_COMPATIBLE)
+
+	/* Includes: */
+		#include "../Peripheral/ADC.h"
+
 	/* Enable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)
 			extern "C" {
@@ -135,5 +141,7 @@
 
 	#endif
 	
+#endif
+
 /** @} */
 

LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c

@@ -29,7 +29,7 @@
 */
 
 #include "../../../Common/Common.h"
-#if (ARCH == ARCH_AVR8)
+#if (ARCH == ARCH_AVR8) && defined(TWCR)
 
 #define  __INCLUDE_FROM_TWI_C
 #include "../TWI.h"