I built a C compiler that runs on a Raspberry Pi Pico ($4, 264KB RAM).
It compiles C to ARM Thumb and JIT-executes it.
It can compile its own source code on the hardware.
Full pipeline: preprocessor, parser, type system, Thumb-1/Thumb-2 codegen, mark-and-compact GC, USB REPL.
Try it: flash the UF2, connect serial (115200), type "help".
https://github.com/ezulabs/MicroCC
Show HN: A self-hosting C compiler that runs on a Raspberry Pi Pico
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