GDB can not step into nor over Qt sources: assembly code shown instead

Hi, I can not step into nor over Qt sources.

Have played with both the gdb set substitute-path and set directories options for a couple of days with no result - also I am not sure if I had to as my sources never moved.

I did build Qt from sources (debug and release) and never moved them so the location is the same of the one that I get when I run the objdump tool over the generated qt libs.

Am attaching the CMakelists that I am using for my sample project.

I did notice that QtCreator does some magic with the gdb debugger:

1929set substitute-path C:/work/build/qt5_workdir/w/s  C:/usr/local/Qt-5.9.1

1930set substitute-path Q:/qt5_workdir/w/s  C:/usr/local/Qt-5.9.1

1931set substitute-path c:/Users/qt/work/install  C:/usr/local/Qt-5.9.1

1932set substitute-path c:/users/qt/work/qt  C:/usr/local/Qt-5.9.1

And I am not sure if this stuff is really needed as the C:/usr/local/Qt-5.9.1 directory is the install dir (QTDIR)

Also tried to adjust the source manually by having:

2931set substitute-path C:/work/build/qt5_workdir/w/s C:/5.9.1/qt-everywhere-opensource-src-5.9.1

2932set substitute-path Q:/qt5_workdir/w/s C:/5.9.1/qt-everywhere-opensource-src-5.9.1

2933set substitute-path c:/Users/qt/work/install C:/5.9.1/qt-everywhere-opensource-src-5.9.1

2934set substitute-path c:/users/qt/work/qt C:/5.9.1/qt-everywhere-opensource-src-5.9.1

This however still makes no difference and I am wandering if it is really needed.

Please guys help...I am not the one only that can not debug nor step over the qt sources without having only the assembly code.

I am also attaching the objdump for my Qt5Cored.dll

Thanks