b) Passing NULL as argument: as NULL can't be unambiguously converted to
wxString, in many cases code using it won't compile any more and NULL
- should be replaced with an empty string.
+ should be replaced with an empty string. The same issue also applies to
+ the structure fields which used to contain "const wxChar *" pointers (such
+ as wxCmdLineEntryDesc::shortName, longName and description fields) and are
+ now wxStrings: empty strings should be assigned to them instead of NULL.