The stage 1 compiler is written in C++, but the Stage 2 compiler will be Zig: https://github.com/ziglang/zig#stage-2-build-self-hosted-zig-from-zig-source-code

The stage 1 compiler is written in C++, but the Stage 2 compiler will be Zig: https://github.com/ziglang/zig#stage-2-build-self-hosted-zig-from-zig-source-code https://github.com/ziglang/zig#stage-2-build-self-hosted-zig... Eventually, i'll be Zig all the way down, but the language needs to get to the point where it can actually support writing a compiler for itself (and Andrew has some big plans for the way the compiler should work from what I understand).