I went down a deep but entertaining rabbit hole in the other direction for fun: https://github.com/ayourtch-llm/fakelinux - initially with the idea “just replace the syscalls in the executable with some sort of a trap and handle that”.

It almost worked, unfortunately MacOS reserves x18 for platform purposes and Linux doesn’t.

The result is some sort of pretty mad contraption which works sufficiently often to compile aarch64 Linux VPP and its dependencies on the Mac using Linux gcc :)

I suppose with some polish it might be useful for something..