For 32-bit x86 (i386 and i686), I've written a libc and a toolchain to.automate this: https://github.com/pts/minilibc686 https://github.com/pts/minilibc686 . It

For 32-bit x86 (i386 and i686), I've written a libc and a toolchain to.automate this: https://github.com/pts/minilibc686 https://github.com/pts/minilibc686 . It can use mainstream free C compilers (GCC, Clang, OpenWatcom cc386, TinyCC and PCC) and assemblers (GNU as and NASM) out of the box. A printf-hello-world is about 1 KiB. A write-hello-world (syscalls only) is less than 200 bytes. Assembly programming skills not needed to use it.