-#if defined(__VISAGECPP__)
-WXDLLEXPORT_DATA(extern const wxValidator*) wxDefaultValidator;
-#else
-WXDLLEXPORT_DATA(extern const wxValidator) wxDefaultValidator;
-#endif
+extern WXDLLIMPEXP_DATA_CORE(const wxValidator) wxDefaultValidator;
+
+#define wxVALIDATOR_PARAM(val) val
+
+#else // !wxUSE_VALIDATORS
+ // wxWidgets is compiled without support for wxValidator, but we still
+ // want to be able to pass wxDefaultValidator to the functions which take
+ // a wxValidator parameter to avoid using "#if wxUSE_VALIDATORS"
+ // everywhere
+ class WXDLLIMPEXP_FWD_CORE wxValidator;
+ #define wxDefaultValidator (*((wxValidator *)NULL))
+
+ // this macro allows to avoid warnings about unused parameters when
+ // wxUSE_VALIDATORS == 0
+ #define wxVALIDATOR_PARAM(val)
+#endif // wxUSE_VALIDATORS/!wxUSE_VALIDATORS