This shaves away 144kb of bss memory from every binary linking printf at the expense of slightly increased binary footprint. Kudos for Byron Lai.
It's now possible to run commands like: make -j8 m=aarch64 o/aarch64/test/libc/str Which will cross-compile and run the test suites in a qemu-aarch64 binary that's vendored in the third_party/qemu/ folder within your x86_64 build environment.