But which, if any, of these compilers/enviroments was self-hosted
(compiled using itself)?
I think this may only apply to HyperC but I couldn't say for sure.
IIRC, the doc's mention something about this. Since both C systems use
byte code interpreters I would not be surprised if both were
self-hosted. Without original source files we may never know.
Actually, it would be easy enough to take a look at the compiler
and see if it is M/L or interpretive code. Although using the same
runtime doesn't guarantee that it was self-hosted, it's a strong
implication.