Cross compiling

[Francesco Ariis]

Hello forthers,

    I was reading the manual section on cross-compiling [1], but the
documentation seems a bit outdated (e.g. `kernl-8086.fi` target is not
present in my `gforth-0.7.3`).

I tried:

    s" ../mach16l.fs"  ok
    include main.fs
    in file included from main.fs:43
    ../cross.fs:1160: No such file or directory
    U<<<@
    Backtrace:
    $7F984F9A4A08 throw

Generally speaking, how difficult is it to cross compile the interpreter
for another architecture?
Can I do that even for older hardware as the Z80 or the Sharp LH79520?
Or would I be better off bootstrapping forth myself in assembly?
I hope my questions aren’t too vague, thanks for any pointer
—F

[1] https://gforth.org/manual/Using-the-Cross-Compiler.html