How to debug an Qt-Android application build with cmake?

Question

I want to debug a Qt based Android application which is build using cmake (instead of qmake).

The androiddeployqt command bundles the apk and adds gdbserver . Then I can launch the gdb server via:

adb shell run-as com.package.name /data/data/com.package.name/lib/libgdbserver.so --once :5055 --attach $PID

and also I forward the port to my desktop via adb forward tcp:5055 tcp:5055

Attaching gdb from Qt-Creator succeeds but something seems to be missing. I am not shown any symbols and the number of displayed threads is not coherent.

Answer 1

I finally managed to get it running. For future documentation, here is what I was missing: I needed the libraries of my application as well as the Qt libraries build in debug mode. Further more I needed the executables and libraries from the phone. I fetched them via

adb pull /system/bin  ./
adb pull /system/lib  ./

adb creates subfolders when pulling and that was one of my problems: All these files need to be stored in one single folder – so I moved them.

Finally I needed to make gdb use the collected files via

set auto-solib-add on
set solib-search-path /tmp/adb