clang: fix -Wunused-parameter, -Wunused-variable, -Wswitch

src/Mod/Sketcher/App/GeoList.cpp

@@ -25,6 +25,8 @@
 # include <cassert>
 #endif  // #ifndef _PreComp_
 
+#include <boost/core/ignore_unused.hpp>
+
 #include <Base/Exception.h>
 #include <Base/Vector3D.h>
 
@@ -316,6 +318,7 @@ GeoListModel<GeometryFacadeUniquePtr>::GeoListModel(
     // Under the Single Responsibility Principle GeoListModel cannot be made
     // responsible for releasing those pointers.
     assert(ownerT == false);
+    boost::ignore_unused(ownerT);
 }
 
 template <>