There is a new pull request by q66 against master on the void-packages repository

https://github.com/void-ppc/void-packages repocache-per-arch
https://github.com/void-linux/void-packages/pull/18595

xbps-src: implement per-architecture repocache
That means instead of having a single `hostdir/repocache`, there is now `hostdir/repocache-$XBPS_TARGET_MACHINE`.

This solves multiple problems:

1) When cross-compiling for different architectures and the repos for host and target differ, you will not get signature/checksum conflicts for noarch packages.
2) The `clean-repocache` command will not delete noarch packages that don't belong to that architecture.
3) Clean mixing of glibc and musl masterdirs with the same `hostdir` is now possible; even when building natively, the musl `masterdir` will use its `repocache-foo-musl`, while the `glibc` `masterdir` will use `repocache-foo`.

A patch file from https://github.com/void-linux/void-packages/pull/18595.patch is attached