aarch64 not using binary cache

[SeungheonOh]

I tried to use haskell.nix with my aarch64 machine. However, it attempts to build ghc no matter what version I try. More interestingly, when I try to use GHC966, it builds GHC 966 with GHC964 that it pulled from some binary cache, and when I try to use GHC964, it builds GHC 964 with GHC966 that it got from somewhere.

My question is, do we have aarch64_linux ghc in iog binary cache? and if yes, how can I make it use the pulled ghc instead of building it from scratch

[SeungheonOh]

Also, it would be immensely helpful to have a way to figure out what version of GHC is currently available in binary cache.

[SeungheonOh]

Oh, I just realized aarch64 is not run by ci. Disabled here. Maybe we can enable that?

[hamishmack]

We don't have an aarch64-linux server right now. @angerman is looking into maybe running linux on an apple silicon Mac.

[SeungheonOh]

That would be very helpful. Thanks.

Besides, cross compilation from x86_64-linux to aarch64-linux is not difficult at all. If there are performant enough ci machines, this might also be feasible.

[SeungheonOh]

Update: I successfully built GHC966 via haskell.nix. Works fine.