Compilation issues with meta object systems

If a QObject derived class declares the Q_OBJECT macro in. h, and the definition of this class is wrapped by other preprocessors, such as the following: 

#ifdef Q_OS_WIN 
class KWordConverter : public QObject 

 
#endif 

In this case, no meta object data will be generated for the KWordConverter class, resulting in link failure: 
Unresolvable external symbol 'public: virtual struct QMetaObject const * __cdecl KWordConverter:: metaObject (void) const' ? metaObject@KWordConverter  @@UEBAPEBUQMetaObject@@XZ) 
If it has not been pre processed by # ifdef Q_OS_WIN, there will be no problem. The previous version of VSTools(2.9) also did not have this issue. I have checked the compilation configuration and it is also fine: