Many developers started complaining that lldb debugger shipped with latest XCode update (12.4) no longer works when trying to debug your app. It can be difficult to diagnose the issue because you only see “Debugger started” and “Debugger finished” message in Qt Creator. By using View->Views->Debugger Log you can actually locate the problem and see the “Not allowed to attach to process” error message. Basically lldb now requires your app to be signed with the get-task-allow entitlement which allows other processes (like the debugger) to attach to your app.
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