diff --git a/src/3rdParty/salomesmesh/inc/StdMeshers_CompositeHexa_3D.hxx b/src/3rdParty/salomesmesh/inc/StdMeshers_CompositeHexa_3D.hxx
index e3347383ce..6fef41883c 100644
--- a/src/3rdParty/salomesmesh/inc/StdMeshers_CompositeHexa_3D.hxx
+++ b/src/3rdParty/salomesmesh/inc/StdMeshers_CompositeHexa_3D.hxx
@@ -31,7 +31,7 @@ class SMESH_Mesh;
 class StdMeshers_FaceSide;
 class TopoDS_Edge;
 class TopoDS_Face;
-struct _QuadFaceGrid;
+class _QuadFaceGrid;
 
 /*!
  * \brief Computes hexahedral mesh on a box with composite sides
diff --git a/src/3rdParty/salomesmesh/inc/StdMeshers_QuadToTriaAdaptor.hxx b/src/3rdParty/salomesmesh/inc/StdMeshers_QuadToTriaAdaptor.hxx
index d5aae19639..9426971d71 100644
--- a/src/3rdParty/salomesmesh/inc/StdMeshers_QuadToTriaAdaptor.hxx
+++ b/src/3rdParty/salomesmesh/inc/StdMeshers_QuadToTriaAdaptor.hxx
@@ -29,7 +29,7 @@
 #include <TColgp_HArray1OfPnt.hxx>
 #include <TColgp_HArray1OfVec.hxx>
 class SMESH_Mesh;
-class SMESH_ElementSearcher;
+struct SMESH_ElementSearcher;
 class SMDS_MeshElement;
 class SMDS_MeshNode;
 class SMDS_MeshFace;
diff --git a/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp b/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
index c43c2ac6ae..702d7e354c 100644
--- a/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
+++ b/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
@@ -780,7 +780,7 @@ SMESH_Hypothesis::Hypothesis_Status
   
   // shape 
   
-  bool isAlgo = ( !anHyp->GetType() == SMESHDS_Hypothesis::PARAM_ALGO );
+  bool isAlgo =  !( anHyp->GetType() == SMESHDS_Hypothesis::PARAM_ALGO );
   int   event = isAlgo ? SMESH_subMesh::REMOVE_ALGO : SMESH_subMesh::REMOVE_HYP;
 
   SMESH_subMesh *subMesh = GetSubMesh(aSubShape);
diff --git a/src/Gui/3Dconnexion/GuiApplicationNativeEventAwareMac.cpp b/src/Gui/3Dconnexion/GuiApplicationNativeEventAwareMac.cpp
index 008a281c15..6cfb45a6ce 100644
--- a/src/Gui/3Dconnexion/GuiApplicationNativeEventAwareMac.cpp
+++ b/src/Gui/3Dconnexion/GuiApplicationNativeEventAwareMac.cpp
@@ -29,6 +29,7 @@ uint32_t Gui::GUIApplicationNativeEventAware::lastButtons = 0;
 		  natural_t messageType, 
 		  void *messageArgument)
   {
+    Q_UNUSED(connection)
     //printf("tdx_drv_handler\n");
     //printf("connection: %X\n", connection);
     //printf("messageType %c%c%c%c\n", messageType/0x1000000, messageType/0x10000, messageType/0x100, messageType);
diff --git a/src/Gui/DAGView/DAGModelGraph.h b/src/Gui/DAGView/DAGModelGraph.h
index e6af0a0671..0376cb3b63 100644
--- a/src/Gui/DAGView/DAGModelGraph.h
+++ b/src/Gui/DAGView/DAGModelGraph.h
@@ -133,7 +133,7 @@ namespace Gui
     public:
       Edge_writer(const GraphEW &graphEWIn) : graphEW(graphEWIn) {}
       template <class EdgeW>
-      void operator()(std::ostream& out, const EdgeW& edgeW) const
+      void operator()(std::ostream& out, const EdgeW& /*edgeW*/) const
       {
         out << "[label=\"";
         out << "edge";
diff --git a/src/Mod/Fem/App/FemVTKTools.cpp b/src/Mod/Fem/App/FemVTKTools.cpp
index 8c9f622805..c767beb8c8 100644
--- a/src/Mod/Fem/App/FemVTKTools.cpp
+++ b/src/Mod/Fem/App/FemVTKTools.cpp
@@ -737,7 +737,7 @@ void FemVTKTools::exportFluidicResult(const App::DocumentObject* res, vtkSmartPo
     vars.push_back("TurbulenceDissipationRate");
     vars.push_back("TurbulenceSpecificDissipation");
     for(auto const& var: vars){
-        App::PropertyFloatList* field;
+        App::PropertyFloatList* field = nullptr;
         if (res->getPropertyByName(var))
             field = static_cast<App::PropertyFloatList*>(res->getPropertyByName(var));
         if(!field && !field->getValues().empty()) {
diff --git a/src/Mod/Fem/App/PropertyPostDataObject.cpp b/src/Mod/Fem/App/PropertyPostDataObject.cpp
index 73f21bcd55..d2981993cd 100644
--- a/src/Mod/Fem/App/PropertyPostDataObject.cpp
+++ b/src/Mod/Fem/App/PropertyPostDataObject.cpp
@@ -105,7 +105,7 @@ PyObject *PropertyPostDataObject::getPyObject(void)
     return new PyObject();
 }
 
-void PropertyPostDataObject::setPyObject(PyObject *value)
+void PropertyPostDataObject::setPyObject(PyObject * /*value*/)
 {
 }
 
@@ -167,7 +167,7 @@ unsigned int PropertyPostDataObject::getMemSize (void) const
     return m_dataObject->GetActualMemorySize();
 }
 
-void PropertyPostDataObject::getPaths(std::vector<App::ObjectIdentifier> &paths) const
+void PropertyPostDataObject::getPaths(std::vector<App::ObjectIdentifier> & /*paths*/) const
 {
 //     paths.push_back(App::ObjectIdentifier(getContainer()) << App::ObjectIdentifier::Component::SimpleComponent(getName())
 //                     << App::ObjectIdentifier::Component::SimpleComponent(App::ObjectIdentifier::String("ShapeType")));
diff --git a/src/Mod/Fem/Gui/TaskPostBoxes.cpp b/src/Mod/Fem/Gui/TaskPostBoxes.cpp
index 279005deba..8401b779e1 100644
--- a/src/Mod/Fem/Gui/TaskPostBoxes.cpp
+++ b/src/Mod/Fem/Gui/TaskPostBoxes.cpp
@@ -143,7 +143,7 @@ ViewProviderPointMarker::~ViewProviderPointMarker()
 // TaskDialog
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
-TaskDlgPost::TaskDlgPost(Gui::ViewProviderDocumentObject *view,bool newObj)
+TaskDlgPost::TaskDlgPost(Gui::ViewProviderDocumentObject *view)
     : TaskDialog(), m_view(view)
 {
     assert(view);
@@ -336,6 +336,7 @@ TaskPostClip::TaskPostClip(ViewProviderDocumentObject* view, App::PropertyLink*
 
     assert(view->isDerivedFrom(ViewProviderFemPostClip::getClassTypeId()));
     assert(function);
+    Q_UNUSED(function)
 
     fwidget = NULL;
 
@@ -392,7 +393,7 @@ void TaskPostClip::collectImplicitFunctions() {
     }
 }
 
-void TaskPostClip::on_CreateButton_triggered(QAction* a) {
+void TaskPostClip::on_CreateButton_triggered(QAction*) {
 
     collectImplicitFunctions();
     recompute();
@@ -827,14 +828,14 @@ void TaskPostWarpVector::on_Value_valueChanged(double v) {
     ui->Slider->blockSignals(false);
 }
 
-void TaskPostWarpVector::on_Max_valueChanged(double v) {
+void TaskPostWarpVector::on_Max_valueChanged(double) {
 
     ui->Slider->blockSignals(true);
     ui->Slider->setValue((ui->Value->value() - ui->Min->value()) / (ui->Max->value() - ui->Min->value())*100.);
     ui->Slider->blockSignals(false);
 }
 
-void TaskPostWarpVector::on_Min_valueChanged(double v) {
+void TaskPostWarpVector::on_Min_valueChanged(double) {
 
     ui->Slider->blockSignals(true);
     ui->Slider->setValue((ui->Value->value() - ui->Min->value()) / (ui->Max->value() - ui->Min->value())*100.);
@@ -848,6 +849,7 @@ TaskPostCut::TaskPostCut(ViewProviderDocumentObject* view, App::PropertyLink* fu
 
     assert(view->isDerivedFrom(ViewProviderFemPostCut::getClassTypeId()));
     assert(function);
+    Q_UNUSED(function)
 
     fwidget = NULL;
 
@@ -900,7 +902,7 @@ void TaskPostCut::collectImplicitFunctions() {
     }
 }
 
-void TaskPostCut::on_CreateButton_triggered(QAction* a) {
+void TaskPostCut::on_CreateButton_triggered(QAction*) {
 
     collectImplicitFunctions();
     recompute();
diff --git a/src/Mod/Fem/Gui/TaskPostBoxes.h b/src/Mod/Fem/Gui/TaskPostBoxes.h
index ebab074cf5..ba50c54958 100644
--- a/src/Mod/Fem/Gui/TaskPostBoxes.h
+++ b/src/Mod/Fem/Gui/TaskPostBoxes.h
@@ -125,7 +125,7 @@ class TaskDlgPost : public Gui::TaskView::TaskDialog
     Q_OBJECT
 
 public:
-    TaskDlgPost(Gui::ViewProviderDocumentObject *view, bool newObj=false);
+    TaskDlgPost(Gui::ViewProviderDocumentObject *view);
     ~TaskDlgPost();
 
     void appendBox(TaskPostBox* box);
@@ -198,7 +198,7 @@ public:
     virtual void applyPythonCode();
 
 private Q_SLOTS:
-    void on_CreateButton_triggered(QAction* a);
+    void on_CreateButton_triggered(QAction*);
     void on_FunctionBox_currentIndexChanged(int idx);
     void on_InsideOut_toggled(bool val);
     void on_CutCells_toggled(bool val);
@@ -206,7 +206,7 @@ private Q_SLOTS:
 private:
     void collectImplicitFunctions();
 
-    App::PropertyLink* m_functionProperty;
+  //App::PropertyLink* m_functionProperty;
     QWidget* proxy;
     Ui_TaskPostClip* ui;
     FunctionWidget* fwidget;
@@ -276,8 +276,8 @@ public:
 private Q_SLOTS:
     void on_Slider_valueChanged(int v);
     void on_Value_valueChanged(double v);
-    void on_Max_valueChanged(double v);
-    void on_Min_valueChanged(double v);
+    void on_Max_valueChanged(double);
+    void on_Min_valueChanged(double);
     void on_Vector_currentIndexChanged(int idx);
 
 private:
@@ -298,13 +298,13 @@ public:
     virtual void applyPythonCode();
 
 private Q_SLOTS:
-    void on_CreateButton_triggered(QAction* a);
+    void on_CreateButton_triggered(QAction*);
     void on_FunctionBox_currentIndexChanged(int idx);
 
 private:
     void collectImplicitFunctions();
 
-    App::PropertyLink* m_functionProperty;
+  //App::PropertyLink* m_functionProperty;
     QWidget* proxy;
     Ui_TaskPostCut* ui;
     FunctionWidget* fwidget;
diff --git a/src/Mod/Fem/Gui/ViewProviderFemPostFunction.cpp b/src/Mod/Fem/Gui/ViewProviderFemPostFunction.cpp
index ad1225016b..dcc9d6a03f 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemPostFunction.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemPostFunction.cpp
@@ -437,7 +437,7 @@ void PlaneWidget::onChange(const App::Property& p) {
     setBlockObjectUpdates(false);
 }
 
-void PlaneWidget::normalChanged(double val) {
+void PlaneWidget::normalChanged(double) {
 
      if(!blockObjectUpdates()) {
         Base::Vector3d vec(ui->normalX->value(), ui->normalY->value(), ui->normalZ->value());
@@ -445,7 +445,7 @@ void PlaneWidget::normalChanged(double val) {
      }
 }
 
-void PlaneWidget::originChanged(double val) {
+void PlaneWidget::originChanged(double) {
 
     if(!blockObjectUpdates()) {
         Base::Vector3d vec(ui->originX->value(), ui->originY->value(), ui->originZ->value());
@@ -594,7 +594,7 @@ void SphereWidget::onChange(const App::Property& p) {
     setBlockObjectUpdates(false);
 }
 
-void SphereWidget::centerChanged(double val) {
+void SphereWidget::centerChanged(double) {
 
      if(!blockObjectUpdates()) {
         Base::Vector3d vec(ui->centerX->value(), ui->centerY->value(), ui->centerZ->value());
@@ -602,7 +602,7 @@ void SphereWidget::centerChanged(double val) {
      }
 }
 
-void SphereWidget::radiusChanged(double val) {
+void SphereWidget::radiusChanged(double) {
 
     if(!blockObjectUpdates()) {
         static_cast<Fem::FemPostSphereFunction*>(getObject())->Radius.setValue(ui->radius->value());
diff --git a/src/Mod/Fem/Gui/ViewProviderFemPostFunction.h b/src/Mod/Fem/Gui/ViewProviderFemPostFunction.h
index 807c79d6f6..55fb8d0bd3 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemPostFunction.h
+++ b/src/Mod/Fem/Gui/ViewProviderFemPostFunction.h
@@ -133,24 +133,24 @@ public:
 
     //creates the widget used in the task dalogs, either for the function itself or for
     //the fiter using it
-    virtual FunctionWidget* createControlWidget() {return NULL;};
+    virtual FunctionWidget* createControlWidget() {return NULL;}
 
 protected:
     virtual bool setEdit(int ModNum);
     virtual void unsetEdit(int ModNum);
     virtual void onChanged(const App::Property* prop);
 
-    void setAutoScale(bool value) {m_autoscale = value;};
-    bool autoScale()              {return m_autoscale;};
+    void setAutoScale(bool value) {m_autoscale = value;}
+    bool autoScale()              {return m_autoscale;}
 
-    bool isDragging() {return m_isDragging;};
+    bool isDragging() {return m_isDragging;}
 
     virtual SoTransformManip*   setupManipulator();
-    virtual void                draggerUpdate(SoDragger* m) {};
-    SoTransformManip*           getManipulator() {return m_manip;};
-    SoSeparator*                getGeometryNode() {return m_geometrySeperator;};
-    SoScale*                    getScaleNode() {return m_scale;};
-    SoTransform*                getTransformNode() {return m_transform;};
+    virtual void                draggerUpdate(SoDragger*) {}
+    SoTransformManip*           getManipulator() {return m_manip;}
+    SoSeparator*                getGeometryNode() {return m_geometrySeperator;}
+    SoScale*                    getScaleNode() {return m_scale;}
+    SoTransform*                getTransformNode() {return m_transform;}
 
 private:
     static void dragStartCallback(void * data, SoDragger * d);
@@ -178,8 +178,8 @@ public:
     virtual void setViewProvider(ViewProviderFemPostFunction* view);
 
 private Q_SLOTS:
-    void originChanged(double val);
-    void normalChanged(double val);
+    void originChanged(double);
+    void normalChanged(double);
 
 private:
     Ui_PlaneWidget* ui;
@@ -214,8 +214,8 @@ public:
     virtual void setViewProvider(ViewProviderFemPostFunction* view);
 
 private Q_SLOTS:
-    void centerChanged(double val);
-    void radiusChanged(double val);
+    void centerChanged(double);
+    void radiusChanged(double);
 
 private:
     Ui_SphereWidget* ui;
diff --git a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
index 65f6b0745c..8412610081 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
@@ -409,7 +409,7 @@ void ViewProviderFemPostObject::update3D() {
 
 void ViewProviderFemPostObject::WritePointData(vtkPoints* points, vtkDataArray* normals, vtkDataArray* tcoords) {
 
-
+    Q_UNUSED(tcoords)
     double *p;
     int i;
 
@@ -618,7 +618,7 @@ void ViewProviderFemPostObject::show(void) {
 }
 
 
-void ViewProviderFemPostObject::OnChange(Base::Subject< int >& rCaller, int rcReason) {
+void ViewProviderFemPostObject::OnChange(Base::Subject< int >& /*rCaller*/, int /*rcReason*/) {
     bool ResetColorBarRange = false;
     WriteColorData(ResetColorBarRange);
 }
diff --git a/src/Mod/Part/App/Attacher.cpp b/src/Mod/Part/App/Attacher.cpp
index df1e4bb282..d80a475861 100644
--- a/src/Mod/Part/App/Attacher.cpp
+++ b/src/Mod/Part/App/Attacher.cpp
@@ -481,6 +481,9 @@ eRefType AttachEngine::getShapeType(const TopoDS_Shape& sh)
         case GeomAbs_BezierCurve:
         case GeomAbs_BSplineCurve:
         case GeomAbs_OtherCurve:
+#if OCC_VERSION_HEX >= 0x070000
+        case GeomAbs_OffsetCurve:
+#endif
             return rtCurve;
         }
     }break;
diff --git a/src/Mod/Part/App/Geometry.cpp b/src/Mod/Part/App/Geometry.cpp
index 2e81424673..71d8843fb0 100644
--- a/src/Mod/Part/App/Geometry.cpp
+++ b/src/Mod/Part/App/Geometry.cpp
@@ -398,7 +398,7 @@ bool GeomCurve::closestParameterToBasicCurve(const Base::Vector3d& point, double
     
     if (c->IsKind(STANDARD_TYPE(Geom_TrimmedCurve))){
         Handle_Geom_TrimmedCurve tc = Handle_Geom_TrimmedCurve::DownCast(handle());
-        Handle_Geom_Curve bc = Handle_Geom_Curve::DownCast(tc->BasisCurve());
+        Handle_Geom_Curve bc = tc->BasisCurve();
         try {
             if (!bc.IsNull()) {
                 gp_Pnt pnt(point.x,point.y,point.z);
diff --git a/src/Mod/Part/App/Geometry2d.cpp b/src/Mod/Part/App/Geometry2d.cpp
index a1aa48226c..ffcad7efb5 100644
--- a/src/Mod/Part/App/Geometry2d.cpp
+++ b/src/Mod/Part/App/Geometry2d.cpp
@@ -309,7 +309,7 @@ bool Geom2dCurve::closestParameterToBasicCurve(const Base::Vector2d& point, doub
     
     if (c->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))){
         Handle_Geom2d_TrimmedCurve tc = Handle_Geom2d_TrimmedCurve::DownCast(handle());
-        Handle_Geom2d_Curve bc = Handle_Geom2d_Curve::DownCast(tc->BasisCurve());
+        Handle_Geom2d_Curve bc = tc->BasisCurve();
         try {
             if (!bc.IsNull()) {
                 gp_Pnt2d pnt(point.x,point.y);
diff --git a/src/Mod/Part/App/ImportStep.cpp b/src/Mod/Part/App/ImportStep.cpp
index e8761eb758..ad73959164 100644
--- a/src/Mod/Part/App/ImportStep.cpp
+++ b/src/Mod/Part/App/ImportStep.cpp
@@ -233,6 +233,7 @@ int Part::ImportStepParts(App::Document *pcDoc, const char* Name)
     return 0;
 }
 
+#if OCC_VERSION_HEX < 0x070000
 static void findStyledSR (const Handle(StepVisual_StyledItem) &style,
                           Handle(StepShape_ShapeRepresentation)& aSR)
 {
@@ -251,10 +252,13 @@ static void findStyledSR (const Handle(StepVisual_StyledItem) &style,
             break;
     }
 }
+#endif
 
 bool Part::ReadColors (const Handle(XSControl_WorkSession) &WS, std::map<int, Quantity_Color>& hash_col)
 {
 #if OCC_VERSION_HEX >= 0x070000
+    (void)WS;
+    (void)hash_col;
     return Standard_False;
 #else
     STEPConstruct_Styles Styles (WS);
@@ -387,6 +391,7 @@ bool Part::ReadColors (const Handle(XSControl_WorkSession) &WS, std::map<int, Qu
 bool Part::ReadNames (const Handle(XSControl_WorkSession) &WS)
 {
 #if OCC_VERSION_HEX >= 0x070000
+    (void)WS;
     return Standard_False;
 #else
     // get starting data
diff --git a/src/Mod/TechDraw/App/EdgeWalker.cpp b/src/Mod/TechDraw/App/EdgeWalker.cpp
index d6336fbb73..e6d29a075c 100644
--- a/src/Mod/TechDraw/App/EdgeWalker.cpp
+++ b/src/Mod/TechDraw/App/EdgeWalker.cpp
@@ -143,6 +143,7 @@ bool EdgeWalker::setSize(int size)
     m_g.clear();
     for (int i = 0; i < size; i++) {
         boost::adjacency_list<>::vertex_descriptor vd = boost::add_vertex(m_g);
+        (void)vd;
     }
     return true;
 }
diff --git a/src/Mod/TechDraw/Gui/TaskSectionView.h b/src/Mod/TechDraw/Gui/TaskSectionView.h
index 5a5a4c8213..939a18cddd 100644
--- a/src/Mod/TechDraw/Gui/TaskSectionView.h
+++ b/src/Mod/TechDraw/Gui/TaskSectionView.h
@@ -83,8 +83,8 @@ private:
 
     std::string saveSym;
     std::string saveLabel;
-    bool saveHorizSectionLine;
-    bool saveArrowUpSection;
+  //bool saveHorizSectionLine;
+  //bool saveArrowUpSection;
     Base::Vector3d saveSectionProjDir;
     Base::Vector3d saveSectionOrigin;
     Base::Vector3d saveSectionNormal;