Fix some build warnings

private field 'm_dwCookie' is not used
'return' will never be executed
result of comparison of unsigned enum expression < 0 is always false
'FlushDC' overrides a member function but is not marked 'override'
potentially uninitialized local variable 'bound' used

include/wx/msw/webview_ie.h

@@ -157,7 +157,6 @@ private:
     wxIEContainer* m_container;
     wxAutomationObject m_ie;
     IWebBrowser2* m_webBrowser;
-    DWORD m_dwCookie;
     wxCOMPtr<DocHostUIHandler> m_uiHandler;
 
     //We store the current zoom type;

samples/dll/sdk_exe.cpp

@@ -82,8 +82,6 @@ LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
         default:
             return DefWindowProc(hwnd, msg, wParam, lParam);
     }
-
-    return 0;
 }
 
 // ----------------------------------------------------------------------------

src/msw/dc.cpp

@@ -1713,7 +1713,7 @@ void wxMSWDCImpl::SetLogicalFunction(wxRasterOperationMode function)
 
 void wxMSWDCImpl::SetRop(WXHDC dc)
 {
-    if ( !dc || m_logicalFunction < 0 )
+    if ( !dc )
         return;
 
     int rop;

tests/graphics/affinematrix.cpp

@@ -311,7 +311,7 @@ public:
         m_gcdc->SetGraphicsContext(ctx);
     }
 
-    virtual void FlushDC()
+    virtual void FlushDC() wxOVERRIDE
     {
         // Apparently, flushing native Direct2D renderer
         // is not enough to update underlying DC (bitmap)

tests/graphics/clippingbox.cpp

@@ -414,7 +414,7 @@ public:
 
     virtual ~ClippingBoxTestCaseGCDCDirect2D() {}
 
-    virtual void FlushDC()
+    virtual void FlushDC() wxOVERRIDE
     {
         // Apparently, flushing native Direct2D renderer
         // is not enough to update underlying DC (bitmap)
@@ -1616,7 +1616,7 @@ public:
 
     virtual ~ClippingBoxTestCaseGCDirect2D() {}
 
-    virtual void FlushGC()
+    virtual void FlushGC() wxOVERRIDE
     {
         // Apparently, flushing native Direct2D renderer
         // is not enough to update underlying DC (bitmap)

tests/misc/safearrayconverttest.cpp

@@ -126,7 +126,7 @@ void SafeArrayConvertTestCase::VariantListReturnSafeArray()
     wxVariantDataSafeArray*
         vsa = wxStaticCastVariantData(variantCopy.GetData(),
                                       wxVariantDataSafeArray);
-    long bound;
+    long bound wxDUMMY_INITIALIZE(0);
 
     CPPUNIT_ASSERT( vsa );
     CPPUNIT_ASSERT( safeArray.Attach(vsa->GetValue()) );
@@ -177,7 +177,7 @@ void SafeArrayConvertTestCase::StringsReturnSafeArray()
     wxVariantDataSafeArray*
         vsa = wxStaticCastVariantData(variant.GetData(),
                                       wxVariantDataSafeArray);
-    long bound;
+    long bound wxDUMMY_INITIALIZE(0);
 
     CPPUNIT_ASSERT( vsa );
     CPPUNIT_ASSERT( safeArray.Attach(vsa->GetValue()) );