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Re:Selfie: tiny self-compiling C compiler, MIPS emulator and... by rswier on Thursday March 02, 2017 @11:32PM (#13780751)
c4.c author here - selfie seems to fill a niche between c4 and my other more full featured compiler/os swieros. Very cool!

https://github.com/rswier/swieros/blob/master/00README.txt

Re:Selfie: tiny self-compiling C compiler, MIPS emulator and... by pvg on Friday March 03, 2017 @12:29AM (#13780949)
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.