Swift to participate in GSoC 2021!

[SDGGiesbrecht (Jeremy David Giesbrecht)]

This came up on another thread; maybe someone wants to tackle it?

Shrinking toolchain install size

I understood that cached them locally so as not to need network activity again, but that it still clones again from the cache to the workspace. Have more changes been made since that I didn’t notice? Because that is good for speed, but memory‐wise it is a step backward, because it involves an additional clone over what we had before. If the edge cases involving simultaneous builds can be solved, it should be possible to massively reduce drive usage and continue to improve speed at the same time…