How to enable QT_DEBUG_DRAW?

Question

I am currently coding a qt application using QT creator on windows 7.

I browse the source of Qt and saw some debug message with require QT_DEBUG_DRAW to be defined. I tried CONFIG += QT_DEBUG_DRAW, DEFINES += QT_DEBUG_DRAW in the .pro file, I tried to #define QT_DEBUG_DRAW before all the includes of QT file and I also tried to set an environnement variable QT_DEBUG_DRAW to 1, but i still don't get the prints message.

Does anybody know how to enable this prints?

Answer 1

Setting the pre-processing variable in your code does not change the fact that Qt was built without this variable set.

You need to recompile Qt with this pre-processing variable set. To do so, download Qt opensource and specify the variable upon configuration:

configure -D QT_DEBUG_DRAW
nmake