Why Do I Get an 'Undefined Reference to vtable' Error in Qt Even Without Virtual Methods?

Undefined Reference to vtable Error in Qt

Question:

When defining a new Qt object, you may encounter a linker error indicating an "undefined reference to vtable for [object name]". Despite the absence of virtual methods in the class, this error persists. Even replacing complex structures with simple integers does not resolve the issue.

Answer:

The linker error is typically caused by a missing call to the Q_OBJECT macro. When adding a new call to this macro, it is crucial to rerun qmake to generate the necessary meta-object information.

Solution:

Simply execute qmake again. This will regenerate the necessary vtables and resolve the linker error, assuming there are no other underlying issues in the code.

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