Fix warnings from Clang 11.

Apparently d'tors in child classes should now be marked override rather than virtual (to match other methods).
So we do that specifically now.

src/cheat/BankRomCheat.hxx

@@ -24,7 +24,7 @@ class BankRomCheat : public Cheat
 {
   public:
     BankRomCheat(OSystem& os, const string& name, const string& code);
-    virtual ~BankRomCheat() = default;
+    ~BankRomCheat() override = default;
 
     bool enable() override;
     bool disable() override;

src/cheat/CheatCodeDialog.hxx

@@ -36,7 +36,7 @@ class CheatCodeDialog : public Dialog
   public:
     CheatCodeDialog(OSystem& osystem, DialogContainer& parent,
                    const GUI::Font& font);
-    virtual ~CheatCodeDialog();
+    ~CheatCodeDialog() override;
 
   protected:
     void handleCommand(CommandSender* sender, int cmd, int data, int id) override;

src/cheat/CheetahCheat.hxx

@@ -24,7 +24,7 @@ class CheetahCheat : public Cheat
 {
   public:
     CheetahCheat(OSystem& os, const string& name, const string& code);
-    virtual ~CheetahCheat() = default;
+    ~CheetahCheat() override = default;
 
     bool enable() override;
     bool disable() override;

src/cheat/RamCheat.hxx

@@ -24,7 +24,7 @@ class RamCheat : public Cheat
 {
   public:
     RamCheat(OSystem& os, const string& name, const string& code);
-    virtual ~RamCheat() = default;
+    ~RamCheat() override = default;
 
     bool enable() override;
     bool disable() override;

src/common/EventHandlerSDL2.cxx

@@ -220,7 +220,6 @@ void EventHandlerSDL2::pollEvent()
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 EventHandlerSDL2::JoystickSDL2::JoystickSDL2(int idx)
-  : myStick(nullptr)
 {
   ASSERT_MAIN_THREAD;
 

src/common/EventHandlerSDL2.hxx

@@ -36,7 +36,7 @@ class EventHandlerSDL2 : public EventHandler
       Create a new SDL2 event handler object
     */
     explicit EventHandlerSDL2(OSystem& osystem);
-    virtual ~EventHandlerSDL2();
+    ~EventHandlerSDL2() override;
 
   private:
     /**
@@ -61,7 +61,7 @@ class EventHandlerSDL2 : public EventHandler
         virtual ~JoystickSDL2();
 
       private:
-        SDL_Joystick* myStick;
+        SDL_Joystick* myStick{nullptr};
     };
 
   private:

src/common/FBSurfaceSDL2.hxx

@@ -35,7 +35,7 @@ class FBSurfaceSDL2 : public FBSurface
     FBSurfaceSDL2(FrameBufferSDL2& buffer, uInt32 width, uInt32 height,
                   FrameBuffer::ScalingInterpolation interpolation,
                   const uInt32* staticData);
-    virtual ~FBSurfaceSDL2();
+    ~FBSurfaceSDL2() override;
 
     // Most of the surface drawing primitives are implemented in FBSurface;
     // the ones implemented here use SDL-specific code for extra performance

src/common/FrameBufferSDL2.hxx

@@ -39,7 +39,7 @@ class FrameBufferSDL2 : public FrameBuffer
       Creates a new SDL2 framebuffer
     */
     explicit FrameBufferSDL2(OSystem& osystem);
-    virtual ~FrameBufferSDL2();
+    ~FrameBufferSDL2() override;
 
     //////////////////////////////////////////////////////////////////////
     // The following are derived from public methods in FrameBuffer.hxx

src/common/PaletteHandler.hxx

@@ -54,7 +54,6 @@ class PaletteHandler
 
   public:
     PaletteHandler(OSystem& system);
-    virtual ~PaletteHandler() = default;
 
     /**
       Cycle through available palettes.

src/common/SoundNull.hxx

@@ -43,11 +43,7 @@ class SoundNull : public Sound
     {
       Logger::info("Sound disabled.\n");
     }
-
+    ~SoundNull() override = default;
-    /**
-      Destructor
-    */
-    virtual ~SoundNull() = default;
 
   public:
     /**

src/common/SoundSDL2.hxx

@@ -48,7 +48,7 @@ class SoundSDL2 : public Sound
     /**
       Destructor
     */
-    virtual ~SoundSDL2();
+    ~SoundSDL2() override;
 
   public:
     /**

src/common/sdl_blitter/BilinearBlitter.hxx

@@ -29,7 +29,7 @@ class BilinearBlitter : public Blitter {
 
     BilinearBlitter(FrameBufferSDL2& fb, bool interpolate);
 
-    virtual ~BilinearBlitter();
+    ~BilinearBlitter() override;
 
     virtual void reinitialize(
       SDL_Rect srcRect,

src/common/sdl_blitter/QisBlitter.hxx

@@ -31,7 +31,7 @@ class QisBlitter : public Blitter {
 
     static bool isSupported(FrameBufferSDL2 &fb);
 
-    virtual ~QisBlitter();
+    ~QisBlitter() override;
 
     virtual void reinitialize(
       SDL_Rect srcRect,

src/debugger/CartDebug.hxx

@@ -70,7 +70,7 @@ class CartDebug : public DebuggerSystem
 
   public:
     CartDebug(Debugger& dbg, Console& console, const OSystem& osystem);
-    virtual ~CartDebug() = default;
+    ~CartDebug() override = default;
 
     const DebuggerState& getState() override;
     const DebuggerState& getOldState() override { return myOldState; }

src/debugger/Debugger.hxx

@@ -73,7 +73,7 @@ class Debugger : public DialogContainer
       Create a new debugger parent object
     */
     Debugger(OSystem& osystem, Console& console);
-    virtual ~Debugger();
+    ~Debugger() override;
 
   private:
     static const Int8 ANY_BANK = -1;

src/debugger/DebuggerSystem.hxx

@@ -31,7 +31,7 @@ class DebuggerState
 {
   public:
     DebuggerState()  = default;
-    ~DebuggerState() = default;
+    virtual ~DebuggerState() = default;
 
     DebuggerState(const DebuggerState&) = default;
     DebuggerState(DebuggerState&&) = delete;

src/debugger/gui/AmigaMouseWidget.hxx

@@ -28,7 +28,7 @@ class AmigaMouseWidget : public PointingDeviceWidget
     AmigaMouseWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                      Controller& controller);
 
-    virtual ~AmigaMouseWidget() = default;
+    ~AmigaMouseWidget() override = default;
 
   private:
     const std::array<uInt8, 4> myGrayCodeTable = { 0b00, 0b10, 0b11, 0b01 };

src/debugger/gui/AtariMouseWidget.hxx

@@ -27,8 +27,7 @@ class AtariMouseWidget : public PointingDeviceWidget
   public:
     AtariMouseWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                      Controller& controller);
-
+    ~AtariMouseWidget() override = default;
-    virtual ~AtariMouseWidget() = default;
 
   private:
     const std::array<uInt8, 4> myGrayCodeTable = { 0b00, 0b01, 0b11, 0b10 };

src/debugger/gui/AtariVoxWidget.hxx

@@ -27,7 +27,7 @@ class AtariVoxWidget : public FlashWidget
   public:
     AtariVoxWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                    Controller& controller);
-    virtual ~AtariVoxWidget() = default;
+    ~AtariVoxWidget() override = default;
 
   private:
     void eraseCurrent() override;

src/debugger/gui/AudioWidget.hxx

@@ -29,7 +29,7 @@ class AudioWidget : public Widget, public CommandSender
   public:
     AudioWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
                 int x, int y, int w, int h);
-    virtual ~AudioWidget() = default;
+    ~AudioWidget() override = default;
 
   private:
     // ID's for the various widgets

src/debugger/gui/BoosterWidget.hxx

@@ -26,7 +26,7 @@ class BoosterWidget : public ControllerWidget
   public:
     BoosterWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                    Controller& controller);
-    virtual ~BoosterWidget() = default;
+    ~BoosterWidget() override = default;
 
   private:
     enum { kJUp = 0, kJDown, kJLeft, kJRight, kJFire, kJBooster, kJTrigger };

src/debugger/gui/Cart0840Widget.hxx

@@ -29,7 +29,7 @@ class Cartridge0840Widget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         Cartridge0840& cart);
-    virtual ~Cartridge0840Widget() = default;
+    ~Cartridge0840Widget() override = default;
 
   private:
     string manufacturer() override { return "Fred X. Quimby"; }

src/debugger/gui/Cart2KWidget.hxx

@@ -29,7 +29,7 @@ class Cartridge2KWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       Cartridge2K& cart);
-    virtual ~Cartridge2KWidget() = default;
+    ~Cartridge2KWidget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/Cart3EPlusWidget.hxx

@@ -32,7 +32,7 @@ class Cartridge3EPlusWidget : public CartridgeEnhancedWidget
                           const GUI::Font& nfont,
                           int x, int y, int w, int h,
                           Cartridge3EPlus& cart);
-    virtual ~Cartridge3EPlusWidget() = default;
+    ~Cartridge3EPlusWidget() override = default;
 
   private:
     string manufacturer() override { return "Thomas Jentzsch"; }

src/debugger/gui/Cart3EWidget.hxx

@@ -31,7 +31,7 @@ class Cartridge3EWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       Cartridge3E& cart);
-    virtual ~Cartridge3EWidget() = default;
+    ~Cartridge3EWidget() override = default;
 
   private:
     enum {

src/debugger/gui/Cart3FWidget.hxx

@@ -29,7 +29,7 @@ class Cartridge3FWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       Cartridge3F& cart);
-    virtual ~Cartridge3FWidget() = default;
+    ~Cartridge3FWidget() override = default;
 
   private:
     string manufacturer() override { return "TigerVision"; }

src/debugger/gui/Cart4A50Widget.hxx

@@ -30,7 +30,7 @@ class Cartridge4A50Widget : public CartDebugWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         Cartridge4A50& cart);
-    virtual ~Cartridge4A50Widget() = default;
+    ~Cartridge4A50Widget() override = default;
 
   private:
     Cartridge4A50& myCart;

src/debugger/gui/Cart4KSCWidget.hxx

@@ -29,7 +29,7 @@ class Cartridge4KSCWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       Cartridge4KSC& cart);
-    virtual ~Cartridge4KSCWidget() = default;
+    ~Cartridge4KSCWidget() override = default;
 
   private:
     string manufacturer() override { return "homebrew intermediate format"; }

src/debugger/gui/Cart4KWidget.hxx

@@ -29,7 +29,7 @@ class Cartridge4KWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       Cartridge4K& cart);
-    virtual ~Cartridge4KWidget() = default;
+    ~Cartridge4KWidget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartARWidget.hxx

@@ -30,7 +30,7 @@ class CartridgeARWidget : public CartDebugWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeAR& cart);
-    virtual ~CartridgeARWidget() = default;
+    ~CartridgeARWidget() override = default;
 
   private:
     CartridgeAR& myCart;

src/debugger/gui/CartBFSCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeBFSCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeBFSC& cart);
-    virtual ~CartridgeBFSCWidget() = default;
+    ~CartridgeBFSCWidget() override = default;
 
   private:
     string manufacturer() override { return "CPUWIZ"; }

src/debugger/gui/CartBFWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeBFWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeBF& cart);
-    virtual ~CartridgeBFWidget() = default;
+    ~CartridgeBFWidget() override = default;
 
   private:
     string manufacturer() override { return "CPUWIZ"; }

src/debugger/gui/CartBUSWidget.hxx

@@ -32,7 +32,7 @@ class CartridgeBUSWidget : public CartDebugWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeBUS& cart);
-    virtual ~CartridgeBUSWidget() = default;
+    ~CartridgeBUSWidget() override = default;
 
   private:
     struct CartState {

src/debugger/gui/CartCDFInfoWidget.hxx

@@ -28,7 +28,7 @@ class CartridgeCDFInfoWidget : public CartDebugWidget
                             const GUI::Font& nfont,
                             int x, int y, int w, int h,
                             CartridgeCDF& cart);
-    virtual ~CartridgeCDFInfoWidget() = default;
+    ~CartridgeCDFInfoWidget() override = default;
 
   private:
     static string describeCDFVersion(CartridgeCDF::CDFSubtype subtype);

src/debugger/gui/CartCDFWidget.hxx

@@ -33,7 +33,7 @@ class CartridgeCDFWidget : public CartDebugWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeCDF& cart);
-    virtual ~CartridgeCDFWidget() = default;
+    ~CartridgeCDFWidget() override = default;
 
   private:
     struct CartState {

src/debugger/gui/CartCMWidget.hxx

@@ -34,7 +34,7 @@ class CartridgeCMWidget : public CartDebugWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeCM& cart);
-    virtual ~CartridgeCMWidget() = default;
+    ~CartridgeCMWidget() override = default;
 
   private:
     struct CartState {

src/debugger/gui/CartCTYWidget.hxx

@@ -30,7 +30,7 @@ class CartridgeCTYWidget : public CartDebugWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeCTY& cart);
-    virtual ~CartridgeCTYWidget() = default;
+    ~CartridgeCTYWidget() override = default;
 
   private:
     CartridgeCTY& myCart;

src/debugger/gui/CartCVWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeCVWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeCV& cart);
-    virtual ~CartridgeCVWidget() = default;
+    ~CartridgeCVWidget() override = default;
 
   private:
     string manufacturer() override { return "CommaVid"; }

src/debugger/gui/CartDFSCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeDFSCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeDFSC& cart);
-    virtual ~CartridgeDFSCWidget() = default;
+    ~CartridgeDFSCWidget() override = default;
 
   private:
     string manufacturer() override { return "CPUWIZ"; }

src/debugger/gui/CartDFWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeDFWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeDF& cart);
-    virtual ~CartridgeDFWidget() = default;
+    ~CartridgeDFWidget() override = default;
 
   private:
     string manufacturer() override { return "CPUWIZ"; }

src/debugger/gui/CartDPCPlusWidget.hxx

@@ -32,7 +32,7 @@ class CartridgeDPCPlusWidget : public CartDebugWidget
                            const GUI::Font& nfont,
                            int x, int y, int w, int h,
                            CartridgeDPCPlus& cart);
-    virtual ~CartridgeDPCPlusWidget() = default;
+    ~CartridgeDPCPlusWidget() override = default;
 
   private:
     struct CartState {

src/debugger/gui/CartDPCWidget.hxx

@@ -31,7 +31,7 @@ class CartridgeDPCWidget : public CartDebugWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeDPC& cart);
-    virtual ~CartridgeDPCWidget() = default;
+    ~CartridgeDPCWidget() override = default;
 
   private:
     struct CartState {

src/debugger/gui/CartDebugWidget.hxx

@@ -35,7 +35,7 @@ class CartDebugWidget : public Widget, public CommandSender
     CartDebugWidget(GuiObject* boss, const GUI::Font& lfont,
                     const GUI::Font& nfont,
                     int x, int y, int w, int h);
-    virtual ~CartDebugWidget() = default;
+    ~CartDebugWidget() override = default;
 
   public:
     int addBaseInformation(size_t bytes, const string& manufacturer,

src/debugger/gui/CartE0Widget.hxx

@@ -29,7 +29,7 @@ class CartridgeE0Widget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeE0& cart);
-    virtual ~CartridgeE0Widget() = default;
+    ~CartridgeE0Widget() override = default;
 
   private:
     string manufacturer() override { return "Parker Brothers"; }

src/debugger/gui/CartE78KWidget.hxx

@@ -27,7 +27,7 @@ class CartridgeE78KWidget : public CartridgeMNetworkWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeMNetwork& cart);
-    virtual ~CartridgeE78KWidget() = default;
+    ~CartridgeE78KWidget() override = default;
 
   protected:
     const char* getSpotLower(int idx) override;

src/debugger/gui/CartE7Widget.hxx

@@ -27,7 +27,7 @@ class CartridgeE7Widget : public CartridgeMNetworkWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeMNetwork& cart);
-    virtual ~CartridgeE7Widget() = default;
+    ~CartridgeE7Widget() override = default;
 
   protected:
     const char* getSpotLower(int idx) override;

src/debugger/gui/CartEFSCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeEFSCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeEFSC& cart);
-    virtual ~CartridgeEFSCWidget() = default;
+    ~CartridgeEFSCWidget() override = default;
 
   private:
     string manufacturer() override { return "Paul Slocum / Homestar Runner"; }

src/debugger/gui/CartEFWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeEFWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeEF& cart);
-    virtual ~CartridgeEFWidget() = default;
+    ~CartridgeEFWidget() override = default;
 
   private:
     string manufacturer() override { return "Paul Slocum / Homestar Runner"; }

src/debugger/gui/CartEnhancedWidget.hxx

@@ -35,7 +35,7 @@ class CartridgeEnhancedWidget : public CartDebugWidget
                             const GUI::Font& nfont,
                             int x, int y, int w, int h,
                             CartridgeEnhanced& cart);
-    virtual ~CartridgeEnhancedWidget() = default;
+    ~CartridgeEnhancedWidget() override = default;
 
   protected:
     int initialize();

src/debugger/gui/CartF0Widget.hxx

@@ -29,7 +29,7 @@ class CartridgeF0Widget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeF0& cart);
-    virtual ~CartridgeF0Widget() = default;
+    ~CartridgeF0Widget() override = default;
 
   private:
     string manufacturer() override { return "Dynacom Megaboy"; }

src/debugger/gui/CartF4SCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeF4SCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeF4SC& cart);
-    virtual ~CartridgeF4SCWidget() = default;
+    ~CartridgeF4SCWidget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartF4Widget.hxx

@@ -29,7 +29,7 @@ class CartridgeF4Widget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeF4& cart);
-    virtual ~CartridgeF4Widget() = default;
+    ~CartridgeF4Widget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartF6SCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeF6SCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeF6SC& cart);
-    virtual ~CartridgeF6SCWidget() = default;
+    ~CartridgeF6SCWidget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartF6Widget.hxx

@@ -29,7 +29,7 @@ class CartridgeF6Widget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeF6& cart);
-    virtual ~CartridgeF6Widget() = default;
+    ~CartridgeF6Widget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartF8SCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeF8SCWidget : public CartridgeEnhancedWidget
                         const GUI::Font& nfont,
                         int x, int y, int w, int h,
                         CartridgeF8SC& cart);
-    virtual ~CartridgeF8SCWidget() = default;
+    ~CartridgeF8SCWidget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartF8Widget.hxx

@@ -30,7 +30,7 @@ class CartridgeF8Widget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeF8& cart);
-    virtual ~CartridgeF8Widget() = default;
+    ~CartridgeF8Widget() override = default;
 
   private:
     string manufacturer() override { return "Atari"; }

src/debugger/gui/CartFA2Widget.hxx

@@ -30,7 +30,7 @@ class CartridgeFA2Widget : public CartridgeEnhancedWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeFA2& cart);
-    virtual ~CartridgeFA2Widget() = default;
+    ~CartridgeFA2Widget() override = default;
 
   private:
     CartridgeFA2& myCartFA2;

src/debugger/gui/CartFAWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeFAWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeFA& cart);
-    virtual ~CartridgeFAWidget() = default;
+    ~CartridgeFAWidget() override = default;
 
   private:
     string manufacturer() override { return "CBS"; }

src/debugger/gui/CartFCWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeFCWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeFC& cart);
-    virtual ~CartridgeFCWidget() = default;
+    ~CartridgeFCWidget() override = default;
 
   private:
     string manufacturer() override { return "Amiga Corp."; }

src/debugger/gui/CartFEWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeFEWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeFE& cart);
-    virtual ~CartridgeFEWidget() = default;
+    ~CartridgeFEWidget() override = default;
 
   private:
     string manufacturer() override { return "Activision"; }

src/debugger/gui/CartMDMWidget.hxx

@@ -30,7 +30,7 @@ class CartridgeMDMWidget : public CartridgeEnhancedWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeMDM& cart);
-    virtual ~CartridgeMDMWidget() = default;
+    ~CartridgeMDMWidget() override = default;
 
   private:
     string manufacturer() override { return "Edwin Blink"; }

src/debugger/gui/CartMNetworkWidget.hxx

@@ -31,7 +31,7 @@ class CartridgeMNetworkWidget : public CartDebugWidget
                       int x, int y, int w, int h,
                       //CartridgeE7& cart);
                       CartridgeMNetwork& cart);
-    virtual ~CartridgeMNetworkWidget() = default;
+    ~CartridgeMNetworkWidget() override = default;
 
   protected:
     //CartridgeE7& myCart;

src/debugger/gui/CartRamWidget.hxx

@@ -34,7 +34,7 @@ class CartRamWidget : public Widget, public CommandSender
     CartRamWidget(GuiObject* boss, const GUI::Font& lfont,
                   const GUI::Font& nfont,
                   int x, int y, int w, int h, CartDebugWidget& cartDebug);
-    virtual ~CartRamWidget() = default;
+    ~CartRamWidget() override = default;
 
     void loadConfig() override;
     void setOpsWidget(DataGridOpsWidget* w);
@@ -66,7 +66,7 @@ class CartRamWidget : public Widget, public CommandSender
                           const GUI::Font& nfont,
                           int x, int y, int w, int h,
                           CartDebugWidget& cartDebug);
-        virtual ~InternalRamWidget() = default;
+        ~InternalRamWidget() override = default;
 
       private:
         uInt8 getValue(int addr) const override;

src/debugger/gui/CartSBWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeSBWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeSB& cart);
-    virtual ~CartridgeSBWidget() = default;
+    ~CartridgeSBWidget() override = default;
 
   private:
     string manufacturer() override { return "Fred X. Quimby"; }

src/debugger/gui/CartTVBoyWidget.hxx

@@ -30,7 +30,7 @@ class CartridgeTVBoyWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeTVBoy& cart);
-    virtual ~CartridgeTVBoyWidget() = default;
+    ~CartridgeTVBoyWidget() override = default;
 
   private:
     string manufacturer() override { return "Akor"; }

src/debugger/gui/CartUAWidget.hxx

@@ -29,7 +29,7 @@ class CartridgeUAWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeUA& cart, bool swapHotspots);
-    virtual ~CartridgeUAWidget() = default;
+    ~CartridgeUAWidget() override = default;
 
   private:
     string manufacturer() override { return "UA Limited"; }

src/debugger/gui/CartWDWidget.hxx

@@ -29,9 +29,9 @@ class CartridgeWDWidget : public CartridgeEnhancedWidget
                       const GUI::Font& nfont,
                       int x, int y, int w, int h,
                       CartridgeWD& cart);
-    virtual ~CartridgeWDWidget() = default;
+    ~CartridgeWDWidget() override = default;
 
-private:
+  private:
     CartridgeWD& myCartWD;
 
   private:

src/debugger/gui/CartX07Widget.hxx

@@ -29,7 +29,7 @@ class CartridgeX07Widget : public CartridgeEnhancedWidget
                        const GUI::Font& nfont,
                        int x, int y, int w, int h,
                        CartridgeX07& cart);
-    virtual ~CartridgeX07Widget() = default;
+    ~CartridgeX07Widget() override = default;
 
   private:
     string manufacturer() override { return "AtariAge / John Payson / Fred Quimby"; }

src/debugger/gui/ControllerWidget.hxx

@@ -40,7 +40,7 @@ class ControllerWidget : public Widget, public CommandSender, public ControllerL
       _w = 18 * font.getMaxCharWidth();
       _h = 8 * font.getLineHeight();
     }
-    virtual ~ControllerWidget() = default;
+    ~ControllerWidget() override = default;
 
     virtual void loadConfig() override { }
 

src/debugger/gui/CpuWidget.hxx

@@ -33,7 +33,7 @@ class CpuWidget : public Widget, public CommandSender
   public:
     CpuWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
               int x, int y, int max_w);
-    virtual ~CpuWidget() = default;
+    ~CpuWidget() override = default;
 
     void setOpsWidget(DataGridOpsWidget* w);
     void loadConfig() override;

src/debugger/gui/DataGridOpsWidget.hxx

@@ -36,7 +36,7 @@ class DataGridOpsWidget : public Widget, public CommandSender
 {
   public:
     DataGridOpsWidget(GuiObject* boss, const GUI::Font& font, int x, int y);
-    virtual ~DataGridOpsWidget() = default;
+    ~DataGridOpsWidget() override = default;
 
     void setTarget(CommandReceiver* target);
     void setEnabled(bool e);

src/debugger/gui/DataGridWidget.hxx

@@ -45,7 +45,7 @@ class DataGridWidget : public EditableWidget
                    int colchars, int bits,
                    Common::Base::Fmt format = Common::Base::Fmt::_DEFAULT,
                    bool useScrollbar = false);
-    virtual ~DataGridWidget() = default;
+    ~DataGridWidget() override = default;
 
     void setList(const IntArray& alist, const IntArray& vlist,
                  const BoolArray& changed);

src/debugger/gui/DebuggerDialog.hxx

@@ -57,7 +57,7 @@ class DebuggerDialog : public Dialog
 
     DebuggerDialog(OSystem& osystem, DialogContainer& parent,
                    int x, int y, int w, int h);
-    virtual ~DebuggerDialog();
+    ~DebuggerDialog() override;
 
     const GUI::Font& lfont() const     { return *myLFont;        }
     const GUI::Font& nfont() const     { return *myNFont;        }

src/debugger/gui/DelayQueueWidget.hxx

@@ -28,7 +28,7 @@ class DelayQueueWidget : public Widget
       const GUI::Font& font,
       int x, int y
     );
-    virtual ~DelayQueueWidget() = default;
+    ~DelayQueueWidget() override = default;
 
     void loadConfig() override;
 

src/debugger/gui/DrivingWidget.hxx

@@ -30,7 +30,7 @@ class DrivingWidget : public ControllerWidget
   public:
     DrivingWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                   Controller& controller);
-    virtual ~DrivingWidget() = default;
+    ~DrivingWidget() override = default;
 
   private:
     enum {

src/debugger/gui/FlashWidget.hxx

@@ -28,7 +28,7 @@ class FlashWidget : public ControllerWidget
   public:
     FlashWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                 Controller& controller);
-    virtual ~FlashWidget() = default;
+    ~FlashWidget() override = default;
 
   protected:
     void init(GuiObject* boss, const GUI::Font& font, int x, int y);

src/debugger/gui/GenesisWidget.hxx

@@ -26,7 +26,7 @@ class GenesisWidget : public ControllerWidget
   public:
     GenesisWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                   Controller& controller);
-    virtual ~GenesisWidget() = default;
+    ~GenesisWidget() override = default;
 
   private:
     enum { kJUp = 0, kJDown, kJLeft, kJRight, kJBbtn, kJCbtn };

src/debugger/gui/JoystickWidget.hxx

@@ -26,7 +26,7 @@ class JoystickWidget : public ControllerWidget
   public:
     JoystickWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                    Controller& controller);
-    virtual ~JoystickWidget() = default;
+    ~JoystickWidget() override = default;
 
   private:
     enum { kJUp = 0, kJDown, kJLeft, kJRight, kJFire };

src/debugger/gui/KeyboardWidget.hxx

@@ -26,7 +26,7 @@ class KeyboardWidget : public ControllerWidget
   public:
     KeyboardWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                    Controller& controller);
-    virtual ~KeyboardWidget() = default;
+    ~KeyboardWidget() override = default;
 
   private:
     std::array<CheckboxWidget*, 12> myBox{nullptr};

src/debugger/gui/NullControlWidget.hxx

@@ -44,7 +44,7 @@ class NullControlWidget : public ControllerWidget
                            TextAlign::Center);
     }
 
-    virtual ~NullControlWidget() = default;
+    ~NullControlWidget() override = default;
 
   private:
     // Following constructors and assignment operators not supported

src/debugger/gui/PaddleWidget.hxx

@@ -27,7 +27,7 @@ class PaddleWidget : public ControllerWidget
   public:
     PaddleWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                  Controller& controller);
-    virtual ~PaddleWidget() = default;
+    ~PaddleWidget() override = default;
 
   private:
     enum { kP0Changed = 'P0ch', kP1Changed = 'P1ch',

src/debugger/gui/PointingDeviceWidget.hxx

@@ -28,8 +28,7 @@ class PointingDeviceWidget : public ControllerWidget
   public:
     PointingDeviceWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                          Controller& controller);
-
+    ~PointingDeviceWidget() override = default;
-    virtual ~PointingDeviceWidget() = default;
 
   private:
     enum {

src/debugger/gui/PromptWidget.hxx

@@ -39,7 +39,7 @@ class PromptWidget : public Widget, public CommandSender
   public:
     PromptWidget(GuiObject* boss, const GUI::Font& font,
                  int x, int y, int w, int h);
-    virtual ~PromptWidget() = default;
+    ~PromptWidget() override = default;
 
   public:
     ATTRIBUTE_FMT_PRINTF int printf(const char* format, ...);

src/debugger/gui/RamWidget.hxx

@@ -35,7 +35,7 @@ class RamWidget : public Widget, public CommandSender
     RamWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
               int x, int y, int w, int h,
               uInt32 ramsize, uInt32 numrows, uInt32 pagesize);
-    virtual ~RamWidget();
+    ~RamWidget() override;
 
     void loadConfig() override;
     void setOpsWidget(DataGridOpsWidget* w);

src/debugger/gui/RiotRamWidget.hxx

@@ -34,7 +34,7 @@ class RiotRamWidget : public RamWidget
   public:
     RiotRamWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
                   int x, int y, int w);
-    virtual ~RiotRamWidget() = default;
+    ~RiotRamWidget() override = default;
 
   private:
     uInt8 getValue(int addr) const override;

src/debugger/gui/RiotWidget.hxx

@@ -34,7 +34,7 @@ class RiotWidget : public Widget, public CommandSender
   public:
     RiotWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
                int x, int y, int w, int h);
-    virtual ~RiotWidget() = default;
+    ~RiotWidget() override = default;
 
   private:
     ControllerWidget* addControlWidget(GuiObject* boss, const GUI::Font& font,

src/debugger/gui/RomListSettings.hxx

@@ -32,7 +32,7 @@ class RomListSettings : public Dialog, public CommandSender
 {
   public:
     RomListSettings(GuiObject* boss, const GUI::Font& font);
-    virtual ~RomListSettings() = default;
+    ~RomListSettings() override = default;
 
     /** Show dialog onscreen at the specified coordinates
         ('data' will be the currently selected line number in RomListWidget) */

src/debugger/gui/RomListWidget.hxx

@@ -47,7 +47,7 @@ class RomListWidget : public EditableWidget
   public:
     RomListWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
                     int x, int y, int w, int h);
-    virtual ~RomListWidget() = default;
+    ~RomListWidget() override = default;
 
     void setList(const CartDebug::Disassembly& disasm);
 

src/debugger/gui/RomWidget.hxx

@@ -37,7 +37,7 @@ class RomWidget : public Widget, public CommandSender
   public:
     RomWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
               int x, int y, int w, int h);
-    virtual ~RomWidget() = default;
+    ~RomWidget() override = default;
 
     void invalidate(bool forcereload = true)
     { myListIsDirty = true; if(forcereload) loadConfig(); }

src/debugger/gui/SaveKeyWidget.hxx

@@ -27,7 +27,7 @@ class SaveKeyWidget : public FlashWidget
   public:
     SaveKeyWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                   Controller& controller);
-    virtual ~SaveKeyWidget() = default;
+    ~SaveKeyWidget() override = default;
 
   private:
     void eraseCurrent() override;

src/debugger/gui/TiaInfoWidget.hxx

@@ -31,7 +31,7 @@ class TiaInfoWidget : public Widget, public CommandSender
   public:
     TiaInfoWidget(GuiObject *boss, const GUI::Font& lfont, const GUI::Font& nfont,
                   int x, int y, int max_w);
-    virtual ~TiaInfoWidget() = default;
+    ~TiaInfoWidget() override = default;
 
     void loadConfig() override;
 

src/debugger/gui/TiaOutputWidget.hxx

@@ -31,7 +31,7 @@ class TiaOutputWidget : public Widget, public CommandSender
   public:
     TiaOutputWidget(GuiObject *boss, const GUI::Font& font,
                     int x, int y, int w, int h);
-    virtual ~TiaOutputWidget() = default;
+    ~TiaOutputWidget() override = default;
 
     void loadConfig() override;
     void setZoomWidget(TiaZoomWidget* w) { myZoom = w; }

src/debugger/gui/TiaWidget.hxx

@@ -36,7 +36,7 @@ class TiaWidget : public Widget, public CommandSender
   public:
     TiaWidget(GuiObject* boss, const GUI::Font& lfont, const GUI::Font& nfont,
               int x, int y, int w, int h);
-    virtual ~TiaWidget() = default;
+    ~TiaWidget() override = default;
 
   private:
     DataGridWidget* myColorRegs{nullptr};

src/debugger/gui/TiaZoomWidget.hxx

@@ -29,7 +29,7 @@ class TiaZoomWidget : public Widget, public CommandSender
   public:
     TiaZoomWidget(GuiObject *boss, const GUI::Font& font,
                   int x, int y, int w, int h);
-    virtual ~TiaZoomWidget() = default;
+    ~TiaZoomWidget() override = default;
 
     void loadConfig() override;
     void setPos(int x, int y);

src/debugger/gui/ToggleBitWidget.hxx

@@ -26,7 +26,7 @@ class ToggleBitWidget : public ToggleWidget
   public:
     ToggleBitWidget(GuiObject* boss, const GUI::Font& font,
                     int x, int y, int cols, int rows, int colchars = 1);
-    virtual ~ToggleBitWidget() = default;
+    ~ToggleBitWidget() override = default;
 
     void setList(const StringList& off, const StringList& on);
     void setState(const BoolArray& state, const BoolArray& changed);

src/debugger/gui/TogglePixelWidget.hxx

@@ -26,7 +26,7 @@ class TogglePixelWidget : public ToggleWidget
   public:
     TogglePixelWidget(GuiObject* boss, const GUI::Font& font,
                       int x, int y, int cols, int rows);
-    virtual ~TogglePixelWidget() = default;
+    ~TogglePixelWidget() override = default;
 
     void setColor(ColorId color) { _pixelColor = color; }
     void clearColor() { _pixelColor = kDlgColor; }

src/debugger/gui/ToggleWidget.hxx

@@ -35,7 +35,7 @@ class ToggleWidget : public Widget, public CommandSender
     ToggleWidget(GuiObject* boss, const GUI::Font& font,
                  int x, int y, int cols, int rows,
                  int clicksToChange = 2);
-    virtual ~ToggleWidget() = default;
+    ~ToggleWidget() override = default;
 
     const BoolArray& getState()    { return _stateList; }
     bool getSelectedState() const  { return _stateList[_selectedItem]; }

src/debugger/gui/TrakBallWidget.hxx

@@ -28,7 +28,7 @@ class TrakBallWidget : public PointingDeviceWidget
     TrakBallWidget(GuiObject* boss, const GUI::Font& font, int x, int y,
                    Controller& controller);
 
-    virtual ~TrakBallWidget() = default;
+    ~TrakBallWidget() override = default;
 
   private:
     const std::array<uInt8, 4> myGrayCodeTable = { 0b00, 0b10, 0b01, 0b11 };

src/emucore/AmigaMouse.hxx

@@ -33,7 +33,7 @@ class AmigaMouse : public PointingDevice
     AmigaMouse(Jack jack, const Event& event, const System& system)
       : PointingDevice(jack, event, system, Controller::Type::AmigaMouse,
         trackballSensitivity) { }
-    virtual ~AmigaMouse() = default;
+    ~AmigaMouse() override = default;
 
     /**
       Returns the name of this controller.

src/emucore/AtariMouse.hxx

@@ -33,7 +33,7 @@ class AtariMouse : public PointingDevice
     AtariMouse(Jack jack, const Event& event, const System& system)
       : PointingDevice(jack, event, system, Controller::Type::AtariMouse,
         trackballSensitivity) { }
-    virtual ~AtariMouse() = default;
+    ~AtariMouse() override = default;
 
     /**
       Returns the name of this controller.