QtCreator has a plugin named "Bare Metal". Bare Metal means a computer without an operating system. I have not seen much about Qt Bare Metal development. Is it a way to develop Qt for a bare metal system? Does Qt run on a system with no OS? If yes, what are the advantages of this approach for embedded system development?
Is it a way to develop Qt for a bare metal system?
No.
Does Qt run on a system with no OS?
No.
Bare Metal means you usually have a few KB of RAM and ROM.
I think you are confusing Qt (framework) with QtCreator (IDE). Tim Sander explains it clearly here at the Qt Developer Days in 2013.
This plugin is used for developing small software for such platforms, but without using the Qt framework itself.
In other words, you can still utilize the generic functionality of the Integrated Development Environment.
So, it is not a runtime aid, but development and build time helper. You can still use qmake for building binaries for such very small embedded environments.
Here you can find more information in the official documentation.
You can see a presentation about it from Qt Dev Days 2013 here: https://www.youtube.com/watch?v=hrKz63Q_Rf0
It is a plugin to allow you to develop and debug programs for bare-metal embedded targets in the QtCreator IDE.
It doesn't support the Qt framework on those embedded targets.
来源：https://stackoverflow.com/questions/22434280/what-is-qt-bare-metal