Plane: correct compilation when logging is disabled

ArduPlane/ArduPlane.cpp

@@ -78,7 +78,9 @@ const AP_Scheduler::Task Plane::scheduler_tasks[] = {
     SCHED_TASK(parachute_check,        10,    200),
     SCHED_TASK(terrain_update,         10,    200),
     SCHED_TASK(update_is_flying_5Hz,    5,    100),
+#if LOGGING_ENABLED == ENABLED
     SCHED_TASK(dataflash_periodic,     50,    400),
+#endif
     SCHED_TASK(ins_periodic,           50,     50),
     SCHED_TASK(avoidance_adsb_update,  10,    100),
     SCHED_TASK(button_update,           5,    100),

ArduPlane/Log.cpp

@@ -375,6 +375,7 @@ void Plane::log_init(void)
 
 #else // LOGGING_ENABLED
 
+void Plane::Log_Write_AOA_SSA(void) {}
 void Plane::Log_Write_Attitude(void) {}
 void Plane::Log_Write_Fast(void) {}
 void Plane::Log_Write_Performance() {}
@@ -393,6 +394,7 @@ void Plane::Log_Write_IMU() {}
 void Plane::Log_Write_RC(void) {}
 void Plane::Log_Write_Airspeed(void) {}
 void Plane::Log_Write_Home_And_Origin() {}
+void Plane::Log_Write_Vehicle_Startup_Messages() {}
 
 void Plane::log_init(void) {}
 

ArduPlane/system.cpp

@@ -241,10 +241,12 @@ void Plane::startup_ground(void)
     mission.init();
 
     // initialise DataFlash library
+#if LOGGING_ENABLED == ENABLED
     DataFlash.set_mission(&mission);
     DataFlash.setVehicle_Startup_Log_Writer(
         FUNCTOR_BIND(&plane, &Plane::Log_Write_Vehicle_Startup_Messages, void)
         );
+#endif
 
     // reset last heartbeat time, so we don't trigger failsafe on slow
     // startup