AP_Motors: allow compilation with HAL_LOGGING_ENABLED false

libraries/AP_Motors/AP_MotorsMulticopter.cpp

@@ -378,6 +378,7 @@ float AP_MotorsMulticopter::get_current_limit_max_throttle()
     return get_throttle_hover() + ((1.0 - get_throttle_hover()) * _throttle_limit);
 }
 
+#if HAL_LOGGING_ENABLED
 // 10hz logging of voltage scaling and max trust
 void AP_MotorsMulticopter::Log_Write()
 {
@@ -393,6 +394,7 @@ void AP_MotorsMulticopter::Log_Write()
     };
     AP::logger().WriteBlock(&pkt_mot, sizeof(pkt_mot));
 }
+#endif
 
 // convert actuator output (0~1) range to pwm range
 int16_t AP_MotorsMulticopter::output_to_pwm(float actuator)

libraries/AP_Motors/AP_MotorsMulticopter.h

@@ -89,8 +89,10 @@ public:
     // convert values to PWM min and max if not configured
     void                convert_pwm_min_max_param(int16_t radio_min, int16_t radio_max);
 
+#if HAL_LOGGING_ENABLED
     // 10hz logging of voltage scaling and max trust
     void                Log_Write() override;
+#endif
 
     // Run arming checks
     bool arming_checks(size_t buflen, char *buffer) const override;

libraries/AP_Motors/AP_Motors_Class.h

@@ -5,6 +5,7 @@
 #include <Filter/Filter.h>         // filter library
 #include <Filter/DerivativeFilter.h>
 #include <GCS_MAVLink/GCS_MAVLink.h>
+#include <AP_Logger/AP_Logger_config.h>
 
 // offsets for motors in motor_out and _motor_filtered arrays
 #define AP_MOTORS_MOT_1 0U
@@ -275,8 +276,10 @@ public:
     void set_frame_string(const char * str);
 #endif
 
+#if HAL_LOGGING_ENABLED
     // write log, to be called at 10hz
     virtual void Log_Write() {};
+#endif
 
     enum MotorOptions : uint8_t {
         BATT_RAW_VOLTAGE = (1 << 0U)