fix warnings on clang

library/graphics/hwlib-graphics-canvas.hpp

@@ -23,11 +23,11 @@ class canvas_color : public window, private image {
 
    color buffer[ size_x ][ size_y ];
 
-   void write_implementation( xy pos, color col ) override {
+   void write_implementation( xy pos, color col ) {
        buffer[ pos.x ][ pos.y ] = col;
    }    
 
-   color get_implementation( xy pos ) const override {
+   color get_implementation( xy pos ) const {
        return buffer[ pos.x ][ pos.y ];
    }
 

library/graphics/hwlib-graphics-font-8x8.hpp

@@ -28,7 +28,7 @@ class font_default_8x8 : public font {
 
 public:   
 
-   constexpr const image & operator[]( char c ) const override {
+   virtual const image & operator[]( char c ) const override {
       return images[ c & 0x7F ];      
    }      
 };

library/peripherals/hwlib-glcd-5510.hpp

@@ -31,7 +31,7 @@ namespace hwlib {
 class glcd_5510 : public window {
 private:
    pin_out & sce;
-   pin_out & res;
+   [[maybe_unused]] pin_out & res;
    pin_out & dc;
    pin_out & sdin;
    pin_out & sclk;

library/peripherals/hwlib-glcd-st7789.hpp

@@ -102,7 +102,7 @@ class st7789_spi_dc_cs_rst : public st7789, public window {
    spi_bus & bus;
    pin_out & dc;
    pin_out & cs;
-   pin_out & rst;
+   [[maybe_unused]] pin_out & rst;
 
 public:
 

library/peripherals/hwlib-pcf8591.hpp

@@ -77,7 +77,7 @@ class pcf8591 {
          return chip.get( adc_channel );
       }   
 
-      void refresh(){
+      void refresh() override {
       }
    };
 

library/pins/hwlib-pin-from-pin.hpp

@@ -223,7 +223,7 @@ class pin_in_out_from_oc_t : public pin_in_out {
       slave.write( 1 );	 	  
    }	   
 
-   void direction_set_output(){
+   void direction_set_output() override {
       is_output = true;	   
       // nothing more to do
    }
@@ -270,7 +270,7 @@ class pin_in_out_from_in_out_t : public pin_in_out {
       slave.direction_set_input();  
    }	   
 
-   void direction_set_output(){
+   void direction_set_output() override {
       slave.direction_set_output(); 
    }
 

library/pins/hwlib-pin-invert.hpp

@@ -38,7 +38,7 @@ class pin_invert_from_out_t : public pin_out {
    /// construct from a pin_out
    pin_invert_from_out_t( pin_out & slave ): slave( slave ){}
 
-   void write( bool x ){
+   void write( bool x ) override {
       slave.write( !x );
    }	
 
@@ -69,7 +69,7 @@ class pin_invert_from_in_t : public pin_in {
    /// construct from a pin_in
    pin_invert_from_in_t( pin_in & slave ): slave( slave ){}
 
-   bool read(){
+   bool read() override {
       return ! slave.read();
    }	
 
@@ -100,11 +100,11 @@ class pin_invert_from_in_out_t : public pin_in_out {
    /// construct from a pin_in_out
    pin_invert_from_in_out_t( pin_in_out & slave ): slave( slave ){}
 
-   bool read(){
+   bool read() override {
       return ! slave.read();
    }	
 
-   void write( bool x ){
+   void write( bool x ) override {
       slave.write( !x );
    }	
 
@@ -151,11 +151,11 @@ class pin_invert_from_oc_t : public pin_oc {
    /// construct from a pin_oc
    pin_invert_from_oc_t( pin_oc & slave ): slave( slave ){}
 
-   bool read(){
+   bool read() override {
       return ! slave.read();
    }	
 
-   void write( bool x ){
+   void write( bool x ) override {
       slave.write( !x );
    }	
 

library/ports/hwlib-port-direct.hpp

@@ -42,7 +42,7 @@ class port_direct_from_in_out_t : public port_in_out {
    /// construct from a port_in_out
    port_direct_from_in_out_t( port_in_out & slave ): slave( slave ){}
 
-   uint_fast8_t number_of_pins(){
+   uint_fast8_t number_of_pins() override {
       return slave.number_of_pins();
    }	  
 
@@ -102,7 +102,7 @@ class port_direct_from_in_t : public port_in {
    /// construct from a port_in
    port_direct_from_in_t( port_in & slave ): slave( slave ){}
 
-   uint_fast8_t number_of_pins(){
+   uint_fast8_t number_of_pins() override {
       return slave.number_of_pins();
    }	  
 
@@ -141,7 +141,7 @@ class port_direct_from_out_t : public port_out {
    /// construct from a port_out
    port_direct_from_out_t( port_out & slave ): slave( slave ){}
 
-   uint_fast8_t number_of_pins(){
+   uint_fast8_t number_of_pins() override {
       return slave.number_of_pins();
    }	  
 
@@ -180,7 +180,7 @@ class port_direct_from_oc_t : public port_oc {
    /// construct from a port_oc
    port_direct_from_oc_t( port_oc & slave ): slave( slave ){}
 
-   uint_fast8_t number_of_pins(){
+   uint_fast8_t number_of_pins() override {
       return slave.number_of_pins();
    }	  
 

library/ports/hwlib-port-from-port.hpp

@@ -251,7 +251,7 @@ class port_in_out_from_oc_t : public port_in_out {
       slave.write( 0xFF );	 	  
    }	   
 
-   void direction_set_output(){
+   void direction_set_output() override {
       is_output = true;	   
       // nothing more to do
    }
@@ -302,7 +302,7 @@ class port_in_out_from_in_out_t : public port_in_out {
       slave.direction_set_input();  
    }	   
 
-   void direction_set_output(){
+   void direction_set_output() override {
       slave.direction_set_output(); 
    }