That's a different kind of bootstrapping though. The OP is about building up to a toolchain from almost nothing using only source code and only relying on some

That's a different kind of bootstrapping though. The OP is about building up to a toolchain from almost nothing using only source code and only relying on some tiny binaries that could be hand-assembled or verified. And it also uses a version of TinyCC along the way before it arrives to gcc.