AP_HAL_SITL: add missing override keywords

libraries/AP_HAL_SITL/AnalogIn.h

@@ -12,16 +12,16 @@ public:
     ADCSource(SITL_State *sitlState, int16_t pin);
 
     /* implement AnalogSource virtual api: */
-    float read_average();
-    float read_latest();
-    void set_pin(uint8_t p);
-    float voltage_average();
-    float voltage_latest();
-    float voltage_average_ratiometric() {
+    float read_average() override;
+    float read_latest() override;
+    void set_pin(uint8_t p) override;
+    float voltage_average() override;
+    float voltage_latest() override;
+    float voltage_average_ratiometric() override {
         return voltage_average();
     }
-    void set_stop_pin(uint8_t pin) {}
-    void set_settle_time(uint16_t settle_time_ms) {}
+    void set_stop_pin(uint8_t pin) override {}
+    void set_settle_time(uint16_t settle_time_ms) override {}
 
 private:
     SITL_State *_sitlState;
@@ -33,9 +33,9 @@ private:
 class HALSITL::AnalogIn : public AP_HAL::AnalogIn {
 public:
     explicit AnalogIn(SITL_State *sitlState): _sitlState(sitlState) {}
-    void init();
-    AP_HAL::AnalogSource* channel(int16_t n);
-    float board_voltage(void) {
+    void init() override;
+    AP_HAL::AnalogSource* channel(int16_t n) override;
+    float board_voltage(void) override {
         return 5.0f;
     }
 private:

libraries/AP_HAL_SITL/GPIO.h

@@ -5,17 +5,17 @@
 class HALSITL::GPIO : public AP_HAL::GPIO {
 public:
     explicit GPIO(SITL_State *sitlState): _sitlState(sitlState) {}
-    void init();
-    void pinMode(uint8_t pin, uint8_t output);
-    uint8_t read(uint8_t pin);
-    void write(uint8_t pin, uint8_t value);
-    void toggle(uint8_t pin);
+    void init() override;
+    void pinMode(uint8_t pin, uint8_t output) override;
+    uint8_t read(uint8_t pin) override;
+    void write(uint8_t pin, uint8_t value) override;
+    void toggle(uint8_t pin) override;
 
     /* Alternative interface: */
-    AP_HAL::DigitalSource* channel(uint16_t n);
+    AP_HAL::DigitalSource* channel(uint16_t n) override;
 
     /* return true if USB cable is connected */
-    bool usb_connected(void);
+    bool usb_connected(void) override;
 
 private:
     SITL_State *_sitlState;
@@ -24,10 +24,10 @@ private:
 class HALSITL::DigitalSource : public AP_HAL::DigitalSource {
 public:
     explicit DigitalSource(uint8_t pin);
-    void mode(uint8_t output);
-    uint8_t read();
-    void write(uint8_t value);
-    void toggle();
+    void mode(uint8_t output) override;
+    uint8_t read() override;
+    void write(uint8_t value) override;
+    void toggle() override;
 
 private:
     uint8_t _pin;

libraries/AP_HAL_SITL/Semaphores.h

@@ -10,9 +10,9 @@
 class HALSITL::Semaphore : public AP_HAL::Semaphore {
 public:
     Semaphore();
-    bool give();
-    bool take(uint32_t timeout_ms);
-    bool take_nonblocking();
+    bool give() override;
+    bool take(uint32_t timeout_ms) override;
+    bool take_nonblocking() override;
 protected:
     pthread_mutex_t _lock;
 };