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In which language is F#’s compiler written?
I’ve heard that F#’s compiler is written in F# 🙂
(each next version of F# compiler is written on its previous version)
But:
1. Can’t google if it’s true.
2. If it’s true, in which language is the first version of the F# compiler written?
The F# compiler is written in F#. The source code is available.
It was originally bootstrapped years ago using OCaml, I believe (and perhaps a little C++ as well). (There is still a non-trivial subset of F# that cross-compiles with OCaml, though the F# compiler source base has long since diverged from that.)
The current implementation always uses an LKG (last-known-good) set of binaries (.NET DLLs and EXEs) to bootstrap itself when building from source.