Bump nixpkgs pin for Big Sur support? #930
Description
The final piece of (x86-64) Big Sur support just dropped in nixpkgs, which fixed linking. I assume this affects GHC, as well, though I haven't had a chance to test this myself.
Assuming that's the case, it would be nice to get a nixpkgs pin for a recent nixpkgs main branch working with haskell.nix. To test this, I quickly created a hacked up ci.nix that just tries to build ghc8102 on NixOS/nixpkgs@085da94. That failed while building GHC 8.6.5 during the bootstrap phase, I believe. Here's a partial log (just the bit after I retried the original failed build):
https://gist.github.com/dhess/c657c71005506a97b108c8c0a15668af
I then tried to build ghc865 on the same nixpkgs. That appered to build GHC 8.6.5 successfully (odd, given that it failed during the ghc8102 build), but fails on some of ghc865's dependencies:
https://gist.github.com/dhess/6619b1292874914890aec641e7eaebdb
I'm happy to try to get this building, if someone can give me some hints as to what to try next.