Clang warnings.

--HG--
branch : develop

src/libs/vtools/dialogs/tools/dialogrotation.cpp

@@ -231,6 +231,7 @@ void DialogRotation::ChosenObject(quint32 id, const SceneObject &type)
 //---------------------------------------------------------------------------------------------------------------------
 void DialogRotation::SelectedObject(bool selected, quint32 object, quint32 tool)
 {
+    Q_UNUSED(tool)
     if (stage1)
     {
         if (selected)

src/libs/vtools/tools/drawTools/vdrawtool.cpp

@@ -291,7 +291,6 @@ qreal VDrawTool::CheckFormula(const quint32 &toolId, QString &formula, VContaine
 {
     SCASSERT(data != nullptr)
     qreal result = 0;
-    Calculator *cal = nullptr;
     try
     {
         QScopedPointer<Calculator> cal(new Calculator());

src/libs/vtools/tools/nodeDetails/vabstractnode.h

@@ -47,9 +47,8 @@ public:
     virtual      ~VAbstractNode() Q_DECL_OVERRIDE {}
     static const QString AttrIdTool;
     virtual void ShowVisualization(bool show) Q_DECL_OVERRIDE;
-
-    void incrementReferens();
-    void decrementReferens();
+    virtual void incrementReferens() Q_DECL_OVERRIDE;
+    virtual void decrementReferens() Q_DECL_OVERRIDE;
 
     ParentType GetParentType() const;
     void       SetParentType(const ParentType &value);