Cutting down on lib-c reliance?

[jumpnbrownweasel]

There was a similar topic recently:

Rust on Linux without any libc

Hello! I want to make a really barebones application being as small as possible which cannot depend on glibc. I tried the musl target, but that resulted in a 350KB binary with just an infinite loop in the main function and all general optimizations in release profile (stripped, lto, one codegen unit, Oz, panic abort with custom built std) I really don't want to write that thing in pure assembly or C and as there are already crates for syscalls, which is all I really need externally, I wonder i…