tmg

The 'B' compiler was written in TMG-Compiler-Compiler. TMG (Transmogrifier) https://github.com/amakukha/tmg https://news.ycombinator.com/item?id=26722097 ""Douglas McIlroy ported TMG to an early version of Unix. According to Ken Thompson, McIlroy wrote TMG in TMG on a piece of paper and "decided to give his piece of paper his piece of paper," hand-compiling assembly language that he entered and assembled on Thompson's Unix system running on PDP-7." We are not worthy, friends. We are not worthy." Tons of info, but not much source: "The first B compiler was written by Ken Thompson in the TMG language around 1969. Thompson initially used the TMG compiler to create a version of B for the PDP-7 minicomputer, which generated threaded code. The B compiler was later rewritten in BCPL and cross-compiled on a GE 635 mainframe to produce object code