@Yash001 See https://doc.qt.io/qt-5/qtquick-debugging.html
"what is actual text of DQT_QML_DEBUG?" - there is no text.
-DQT_QML_DEBUG sets QT_QML_DEBUG define (such defines can be checked in C/C++ code using #ifdef QT_QML_DEBUG).
QT_QML_DEBUG activates "QML Debugging Infrastructure".
