Silence override warnings on recent GCC

pcbnew/pcb_track.cpp

@@ -227,6 +227,17 @@ bool PCB_ARC::operator==( const BOARD_ITEM& aBoardItem ) const
 }
 
 
+bool PCB_ARC::operator==( const PCB_TRACK& aOther ) const
+{
+    if( aOther.Type() != Type() )
+        return false;
+
+    const PCB_ARC& other = static_cast<const PCB_ARC&>( aOther );
+
+    return *this == other;
+}
+
+
 bool PCB_ARC::operator==( const PCB_ARC& aOther ) const
 {
     return m_Start == aOther.m_Start
@@ -284,6 +295,17 @@ bool PCB_VIA::operator==( const BOARD_ITEM& aBoardItem ) const
 }
 
 
+bool PCB_VIA::operator==( const PCB_TRACK& aOther ) const
+{
+    if( aOther.Type() != Type() )
+        return false;
+
+    const PCB_VIA& other = static_cast<const PCB_VIA&>( aOther );
+
+    return *this == other;
+}
+
+
 bool PCB_VIA::operator==( const PCB_VIA& aOther ) const
 {
     return m_Start == aOther.m_Start

pcbnew/pcb_track.h

@@ -357,6 +357,9 @@ protected:
     virtual void swapData( BOARD_ITEM* aImage ) override;
 
 private:
+    // Silence GCC warning about overriding the base class method
+    bool operator==( const PCB_TRACK& aOther ) const override;
+
     VECTOR2I m_Mid; ///< Arc mid point, halfway between start and end
 };
 
@@ -657,6 +660,9 @@ protected:
     wxString layerMaskDescribe() const override;
 
 private:
+    // Silence GCC warning about hiding the PCB_TRACK base method
+    bool operator==( const PCB_TRACK& aOther ) const override;
+
     VIATYPE      m_viaType;                  ///< through, blind/buried or micro
 
     PADSTACK     m_padStack;