I'm looking for a C compiler that:

- is simpler and smaller than TinyCC
- is capable of compiling TinyCC
- is written in *very* simple C or a language simpler than C
- can plausibly support risc-v (I can add codegen myself, just can't have deeply hardcoded x86 assumptions)
- has a FOSS license
- is not GNU Mes

Does anything matching these criteria exist?