Guix can now cross build Coreutils, Findutils, grep, and similar (some of them needed to be adjusted), as well as Guile and all its dependencies.
Speaking of which, commit d581ace changes the ABI of (gnu packages pkg-config). Because of that, run “make clean && make” if you have a build tree with .go files around. There’s still a bit of work to do before we can cross-build the bootstrap tarballs, but it’s getting closer. Your help welcome! Ludo’.