The introduction states: > Instead, I've fallen back on the old standby and I'm going to write a compiler for a subset of C, enough to allow the compiler to compile itself.

Just from cruising the lesson titles and poking around a few of them, substantially less than full C89. I don't see floating point, bitfields, or function pointers anywhere. Apparently, variadic functions and short (!) aren't supported either. Most of the new things in C99 (save perhaps //-style comments, mixed declaration and code, and long long) are unlikely to be supported, let alone C11.

Judging from its reference to C-, it might also well not support the full C declarator madness.