Undefined reference to vtable… Q_OBJECT macro [duplicate]

Answer 1

I had same issue when i decided to add Q_OBJECT into my header file.

• First try run qmake manually.

• If not resolved, so delete build folder and build project again

• If building all of the project is a heavy task, so try following steps:

  1. Add a new temp class with QObject as its base class
  2. Double check your header and source file for any mistake using new temp class
  3. Build your project. It should built successfully
  4. Remove your temp class completely (.h and .cpp file and relative lines on .pro file)

Good luck :)