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There's a bunch of other stuff in Selfie beyond the C compiler so you can't really compare them by line count.

c4.c author here - selfie seems to fill a niche between c4 and my other more full featured compiler/os swieros. Very cool!

Yep, I just meant to point out they're different. Selfie is something educators wrote for their purposes. c4.c is more like a piece of code poetry.