AP_GPS: add and use AP_GPS_DRONECAN_ENABLED

libraries/AP_GPS/AP_GPS_DroneCAN.cpp

@@ -16,9 +16,12 @@
 //
 //  UAVCAN GPS driver
 //
+#include "AP_GPS_config.h"
+
+#if AP_GPS_DRONECAN_ENABLED
+
 #include <AP_HAL/AP_HAL.h>
 
-#if HAL_ENABLE_DRONECAN_DRIVERS
 #include "AP_GPS_DroneCAN.h"
 
 #include <AP_CANManager/AP_CANManager.h>
@@ -891,4 +894,4 @@ bool AP_GPS_DroneCAN::instance_exists(const AP_DroneCAN* ap_dronecan)
 }
 #endif // AP_DRONECAN_SEND_GPS
 
-#endif // HAL_ENABLE_DRONECAN_DRIVERS
+#endif // AP_GPS_DRONECAN_ENABLED

libraries/AP_GPS/AP_GPS_DroneCAN.h

@@ -18,9 +18,12 @@
 //
 #pragma once
 
+#include "AP_GPS_config.h"
+
+#if AP_GPS_DRONECAN_ENABLED
+
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
-#if HAL_ENABLE_DRONECAN_DRIVERS
 #include "AP_GPS.h"
 #include "GPS_Backend.h"
 #include "RTCM3_Parser.h"
@@ -147,4 +150,5 @@ private:
         ByteBuffer *buf;
     } _rtcm_stream;
 };
-#endif
+
+#endif  // AP_GPS_DRONECAN_ENABLED

libraries/AP_GPS/AP_GPS_config.h

@@ -10,6 +10,10 @@
 #define AP_GPS_BACKEND_DEFAULT_ENABLED AP_GPS_ENABLED
 #endif
 
+#ifndef AP_GPS_DRONECAN_ENABLED
+#define AP_GPS_DRONECAN_ENABLED HAL_ENABLE_DRONECAN_DRIVERS
+#endif
+
 #ifndef AP_GPS_ERB_ENABLED
   #define AP_GPS_ERB_ENABLED AP_GPS_BACKEND_DEFAULT_ENABLED
 #endif