Edg is writing a good front end. With good error handling and all of the other things that make a commercial program a few hundred times harder than a quick prototype. I'd be writing a brute force front end that is slow, and goes straight to assembly. If there is a syntax error I'll handle it by crashing. When you create a variable is used twice in a row I'll store the intermediate value back into memory and reload it back into my register.

There have been write a c++ compiler classes that did it in a semester. I think they also do the standard library. (but that might be a year long course)