Some popular applications like ghostty, river, ncdu and linuxwave are written in zig, and cpu feature based optimizations for zig applications should be designated in build.zig.
Look at AUR (en) - ghostty-git-zen3 for optimization examples.
While that may be beneficial, the current way to do it seems very tedious and not very viable to do in repositories. Ideally zig adds a similar functionality to CFLAGS (ZFLAGS?). That way we can add it to makepkg.conf
Mhm, is not cpu-baseline=znver4 for example enough?
The PKGBUILD looks like not to be needed