It based on Clang compiler: https://www.embarcadero.com/free-tools/ccompiler
Download link: BCC102.zip
I haven't used this compiler before, and it doesn't appear to be commonly used. It also doesn't appear to be easily installable on Linux like
apt-get install clang (presumably because it is closed source?). So I am not planning to test it myself. If you would like some things to be changed to support it anyway, then please submit a pull request.