alt Hacker NewsFil-C works because you recompile the whole C userspace. Unsafe Rust doesn't do that... and for many practical purposes you probably want to touch the non-safe-version of the C userspace.
Still, it's all LLVM, so perhaps unsafe Rust for Fil-space can be a thing, a useful one for catching (what would be) UBs even [Fil-C defines everything, so no UBs, but I'm assuming you want to eventually run it outside of Fil-space].
Now I actually wonder if Fil-C has an escape hatch somewhere for syscalls that it does not understand etc. Well it doesn't do inline assembly, so I shouldn't expect much... I wonder how far one needs to extend the asm clobber syntax for it to remotely come close to working.
at the bottom of the turtle stack, there's a yolo-c libc that does some syscall stuff:
> libyoloc.so. This is a mostly unmodified [musl/glibc] libc, compiled with Yolo-C. The only changes are to expose some libc internal functionality that is useful for implementing libpizlo.so. Note that libpizlo.so only relies on this library for system calls and a few low level functions. In the future, it's possible that the Fil-C runtime would not have a libc in Yolo Land, but instead libpizlo.so would make syscalls directly.
but mostly you are using a fil-c compiled libc:
> libc.so. This is a modified musl libc compiled with Fil-C. Most of the modifications are about replacing inline assembly for system calls with calls to libpizlo.so's syscall API.
That links here: https://github.com/pizlonator/fil-c/blob/deluge/filc/include...
Quotes from: https://fil-c.org/runtime