first round of debug/release merge: introduce wxDEBUG_LEVEL, for now defined as 1 if __WXDEBUG__ is defined, i.e. no real changes; don't use __WXDEBUG__ in the headers to keep debug and release builds ABI-compatible; add functions to customize or disable asserts handling

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59711 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/dcclient.cpp

@@ -2081,6 +2081,9 @@ void wxWindowDCImpl::SetLogicalFunction( wxRasterOperationMode function )
         case wxNO_OP:        mode = GDK_NOOP;          break;
         case wxSRC_INVERT:   mode = GDK_COPY_INVERT;   break;
         case wxNOR:          mode = GDK_NOR;           break;
+        default:
+            wxFAIL_MSG("unknown mode");
+            return;
     }
 
     m_logicalFunction = function;