Linker error in MDI Qt application: undefined reference to qInitResources_mdi()

Question

I am trying to convert my Qt application to MDI (Multiple Document Interface).

I built the mdi example and everything works smoothly.

Now, following the example, I modified my code, adding this line at the beginning of main():

Q_INIT_RESOURCE(mdi);

I also #include <QApplication> and <QtGui>.

I get this linker error:
main.cpp:24: undefined reference to 'qInitResources_mdi()'

Why is that line accepted in the example and not in my code? I include the same headers, and the makefiles seem not to be the reason.

Platform: Windows 7, MinGW, Qt 4.8.4

Answer 1

OK, I thought that Q_INIT_RESOURCE(mdi) was needed to initialize the application in Multiple Document Interface mode. Instead it just loads a set of files (icons in this case) that were missing from my project.

Removing that line fixed the problem.