Undefined reference to vtable

Question

When building my C++ program, I\'m getting the error message

undefined reference to \'vtable...

What is the cause of this probl

Answer 1

So I was using Qt with Windows XP and MinGW compiler and this thing was driving me crazy.

Basically the moc_xxx.cpp was generated empty even when I was added

Q_OBJECT

Deleting everything making functions virtual, explicit and whatever you guess doesn't worked. Finally I started removing line by line and it turned out that I had

#ifdef something

Around the file. Even when the #ifdef was true moc file was not generated.

So removing all #ifdefs fixed the problem.

This thing was not happening with Windows and VS 2013.