fix various warnings

src/Mod/Part/Gui/SoBrepFaceSet.cpp

@@ -1013,7 +1013,9 @@ void SoBrepFaceSet::renderShape(SoGLRenderAction * action,
         // TODO FINISHING THE COLOR SUPPORT !
 
         if (!PRIVATE(this)->vboLoaded || PRIVATE(this)->updateVbo) {
+#ifdef FC_OS_WIN32
             const cc_glglue * glue = cc_glglue_instance(action->getCacheContext());
+#endif
             if (PRIVATE(this)->updateVbo && PRIVATE(this)->vboLoaded) {
                 // TODO
                 // We must remember the buffer size ... If it has to be extended we must

src/Mod/Robot/App/kdl_cp/jntarray.cpp

@@ -59,13 +59,13 @@ namespace KDL
 
     double JntArray::operator()(unsigned int i,unsigned int j)const
     {
-        assert(j==0);
+        (void)j;assert(j==0);
         return data(i);
     }
 
     double& JntArray::operator()(unsigned int i,unsigned int j)
     {
-        assert(j==0);
+        (void)j;assert(j==0);
         return data(i);
     }
 

src/Mod/Sketcher/App/SketchObject.cpp

@@ -3455,6 +3455,7 @@ int SketchObject::exposeInternalGeometry(int GeoId)
             }
         }
 
+        Q_UNUSED(isfirstweightconstrained);
         // constraint the first weight to allow for seamless weight modification and proper visualization
         /*if(!isfirstweightconstrained) {