It's complete in sofar as being capable of compiling C programs, but it has a few quirks.

https://git.sr.ht/~vdupras/duskos/tree/master/item/fs/doc/co...

From what I can tell chibicc, unlike tcc, is not a complete c compiler in and of itself. Looking at its source code, it relies upon external tools for both x86_64 code gen and linking: https://github.com/rui314/chibicc/blob/90d1f7f199cc55b13c7fd...

By design, it's not a fully compliant ANSI C compiler, so it's never going to be complete, but it's complete enough to, for example, successfully compile Plan 9's driver for the Raspberry Pi USB controller with a minimal porting effort.

So, Dusk's compiler is not apple-to-apple comparable to the other, but comparable enough to give a ballpark idea that its code density compares very, very favorably.