Fix unused variable warnings

src/modules/commander/commander.cpp

@@ -773,7 +773,7 @@ int commander_thread_main(int argc, char *argv[])
 
 	bool updated = false;
 
-	bool rc_calibration_ok = (OK == rc_calibration_check(mavlink_fd));
+	rc_calibration_check(mavlink_fd);
 
 	/* Subscribe to safety topic */
 	int safety_sub = orb_subscribe(ORB_ID(safety));
@@ -934,7 +934,7 @@ int commander_thread_main(int argc, char *argv[])
 				status_changed = true;
 
 				/* re-check RC calibration */
-				rc_calibration_ok = (OK == rc_calibration_check(mavlink_fd));
+				rc_calibration_check(mavlink_fd);
 			}
 
 			/* navigation parameters */

src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp

@@ -807,12 +807,8 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 
 	float eas2tas = 1.0f; // XXX calculate actual number based on current measurements
 
-	// XXX re-visit
-	float baro_altitude = _global_pos.alt;
-
 	/* filter speed and altitude for controller */
 	math::Vector<3> accel_body(_sensor_combined.accelerometer_m_s2);
-	math::Vector<3> accel_earth = _R_nb * accel_body;
 
 	float altitude_error = _pos_sp_triplet.current.alt - _global_pos.alt;
 
@@ -945,8 +941,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> &current_positi
 			float airspeed_land = 1.3f * _parameters.airspeed_min;
 			float airspeed_approach = 1.3f * _parameters.airspeed_min;
 
-			/* Calculate distance (to landing waypoint) and altitude of last ordinary waypoint L */
-			float L_wp_distance = get_distance_to_next_waypoint(prev_wp(0), prev_wp(1), curr_wp(0), curr_wp(1));
+			/* Calculate altitude of last ordinary waypoint L */
 			float L_altitude_rel = _pos_sp_triplet.previous.valid ? _pos_sp_triplet.previous.alt - _pos_sp_triplet.current.alt : 0.0f;
 
 			float bearing_airplane_currwp = get_bearing_to_next_waypoint(current_position(0), current_position(1), curr_wp(0), curr_wp(1));

src/modules/fw_pos_control_l1/mtecs/mTecs.cpp

@@ -220,7 +220,7 @@ int mTecs::updateFlightPathAngleAcceleration(float flightPathAngle, float flight
 	/* Apply overrride given by the limitOverride argument (this is used for limits which are not given by
 	 * parameters such as pitch limits with takeoff waypoints or throttle limits when the launchdetector
 	 * is running) */
-	bool limitApplied = limitOverride.applyOverride(*outputLimiterThrottle, *outputLimiterPitch);
+	limitOverride.applyOverride(*outputLimiterThrottle, *outputLimiterPitch);
 
 	/* Write part of the status message */
 	_status.flightPathAngleSp = flightPathAngleSp;

src/modules/mavlink/mavlink_ftp.cpp

@@ -346,7 +346,7 @@ MavlinkFTP::_workWrite(Request *req)
 MavlinkFTP::ErrorCode
 MavlinkFTP::_workRemove(Request *req)
 {
-	auto hdr = req->header();
+	//auto hdr = req->header();
 
 	// for now, send error reply
 	return kErrPerm;

src/systemcmds/tests/test_mathlib.cpp

@@ -96,8 +96,11 @@ int test_mathlib(int argc, char *argv[])
 		TEST_OP("Vector<3> %% Vector<3>", v1 % v2);
 		TEST_OP("Vector<3> length", v1.length());
 		TEST_OP("Vector<3> length squared", v1.length_squared());
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
 		TEST_OP("Vector<3> element read", volatile float a = v1(0));
 		TEST_OP("Vector<3> element read direct", volatile float a = v1.data[0]);
+#pragma GCC diagnostic pop
 		TEST_OP("Vector<3> element write", v1(0) = 1.0f);
 		TEST_OP("Vector<3> element write direct", v1.data[0] = 1.0f);
 	}