Comment by clhodapp

It's not about hardcoding, it's about the fact that libc isn't even an ABI, really. It's a C source API, which compiles down to a secret ABI that you can't know (you just have to expand all the macros and see what you get). That's sort of OK if every compiled program in the world is written in C, but as soon as you want to start writing in another language it kind of falls apart.