I think it makes sense to have a standalone cross-compilation workgroup to investigate the layout and distribution of toolchain and SDK, to improve the overall cross-compilation functionality of the toolchain and to write up cross-compilation terms and guides. Cross-compilation becomes more and more important a thing with our efforts on embedded programming and bootstrapping, and it also ties to the goal of making Swift available on more platforms, no matter as a host or as a target.
I suggest we continue in another thread on the cross-compilation topic, since @0xTim‘s initiative includes far more than that.