How to better parallelize GHC build.

[Neil Mitchell]

Hi Karel,

> I am. Is this agreed way among the GHC developers? I was not sure so I
> mentioned shake just lightly...

It's certainly agreed to give it a go, and implementation work is
ongoing. If it works better than the existing system then I suspect
we'll switch. I certainly hope to get full parallelism, although I
don't have as many core as you do to test!

Thanks, Neil