[matheusmoreira]

I once wrote a liblinux project just for this!! It was indeed extremely fun. Details in my other comment:

https://news.ycombinator.com/item?id=45709141

I abandoned it because Linux itself now has a rich set of nolibc headers.

Now I'm working on a whole programming language based around this concept. A freestanding lisp interpreter targeting Linux directly with builtin system call support. The idea is to complete the interpreter and then write the standard library and Linux user space in lisp using the system calls.

It's been an amazing journey. It's incredible how far one can take this.