This is a C compiler project that I was working on. It started as a conventional compiler, went through many rewrites, then got converted to a single-pass, stdin/stdout compiler. It's not finished. I know how to finish it but I don't have the motivation to work on it right now.
Currently it can handle integers. It uses the stack for auto variables. It supports functions, global, local variables, limited float support, return values, assignments, extern linkage.