As a sub-question to this, I want to know, since Qt5 is distributed with full source code, is it possible to set up debugger break-points inside Qt itself?
Is there a symbol file shipped with Qt5 for the binary build? Do I have to build my own Qt to do this?
What is the fastest way to have breakpoints inside Qt5 working with Qt Creator on Ubuntu?
You need to configure and build qt yourself with debug symbols. (-debug)
Then in QtCreator you can go to Options > Debugger > General and "Add the Qt-Sources".