NOTE: This subproject moved to its own repository: AlwaysRightInstitute/swift-mac2arm-x-compile-toolchain
What this is good for? You can build Raspberry Pi Swift binaries on a Mac. Like this:
mkdir helloworld && cd helloworld
swift package init --type=executable
swift build --destination /tmp/cross-toolchain/rpi-ubuntu-xenial-destination.json
file .build/debug/helloworld
.build/debug/helloworld: ELF 32-bit LSB executable, ARM,
EABI5 version 1 (SYSV), dynamically linked,
interpreter /lib/ld-linux-armhf.so.3,
for GNU/Linux 3.2.0, not stripped