the requirement is too vague. whats the OS? are common dll (assuming windows) like msvcrt included in the 1.44 MB size or not? .Net runtime also usually installed, will it count too?
c-testsuite is amazing. i use it to test my compiler, but even after passing the test. my compiler still choke on some real world project. also the tests lack many of arcane preprocessor rules. so you still need to read https://www.spinellis.gr/blog/20060626/ in order to understand hideset and its macro expansion algorithm.
well, you can use jules and spend zero dollar on it. I also create similiar project like this, c11 compiler in rust using AI agent + 1 developer(https://github.com/bungcip/cendol). not fully automated like anthophic did, but at least i can understand what it did.