In the last weeks/months, we worked a lot with FPC.
Delphi is still our main IDE, due to its better debugging experience under Windows, but we target to have premium support of FPC, on all platforms, especially Linux.
The new Delphi Linux compiler is out of scope, since it is heavily priced,
its performance is not so good, and ARC broke memory management so would need a
deep review/rewrite of our source code, which we can't afford - since we have
FPC which is, from our
opinion, a much better compiler for Linux.
Of course, you can create clients for Delphi Linux and FMX, as usual, using the cross-platform client parts of mORMot. But for server side, this compiler is not supported, and will probably never be.