Using this native (written in Zig) C compiler to translate C source into Zig source as a part of the build, would presumably lend itself trivially to all the incremental logic in TFA, as updating C would update the generated Zig, and the incremental logic would detect differences just like it detects differences made by a human in an editor. Maybe there are aspects of the generated Zig that would complicate that somewhat, but I don't know -- just a warning about my ignorance.

This is part of plans to remove the hard LLVM dependency. AFAIK, the LLVM dependency will still be a variant many will use for the convenience of Zig as a much better clang, but removing the hard dependency is part of enabling all these great features like incremental compilation.