Gotta love this. I hope to see documented what subset of C it will support

I believe it was said elsewhere that it was expected to compile GCC 4.7 so that gives you a solid idea of the C features it supports.

And so it does, thank you for catching that. I fear that goal is unreachable with such a small team. GCC is hella complicated.

I'd be more optimistic. The cproc C compiler has only a very small team but it supports enough of the C language to compile GCC 4.7.