I'm trying to compile swift presently on Linux. I noticed that there is an option --qt-gui.
What functionality does that provide? It refers to bootstrapping Qt.
Can you elaborate which command-line tool are you referring to that has this option?
I ran swift/utils/build-script.
Looking closer, I see it is in swift-source/cmake/bootstrap.
The option's purpose is to "Build Qt dialog for CMake".
So, it was just a mirage, there's no Qt support for swift itself.