Which flags shall I pass to zig compile-obj to have zig use its own code generation and linker thereby bypassing any calls to LLVM?

I’ve already tried a bunch of them but compilation is still slow (on par with clang).

Reason for asking is that I want to adjust the Zig-parts of https://github.com/nordlow/compiler-benchmark/ to make sure they use the fastest compilation path possible for zig build-obj and zig build-exe.