Add ghc 8.10.1

[hamishmack]

No description provided.

[michaelpj]

Are we building our tests etc across multiple GHC versions? I'm actually not sure what version gets used for the tests...

[hamishmack]

I think the tests only run for 8.6.5. It would be nice to add 8.8.3 and 8.10.1. I should have made this a draft PR. Pushed it to see if it built and eval is failing on hydra right now because of an issue building the windows cross compiler.

[lspitzner]

hey, I tried this, and ran into

"attribute '0.6.1' missing," -- in plan/default.nix: "ghc-prim".revision = (((hackage."ghc-prim")."0.6.1").revisions).default;

As advised by @angerman I tried rebasing it on top of current master at https://github.com/lspitzner/haskell.nix/tree/hkm/ghc8101-rebased. Fixing the merge conflicts was trivial, but the result did not work, however I was able to get a working build by

a) Inserting commit 6642ebc to disable a non-working patch that got added recently (could maybe look into making it 8.10 compatible)
b) Reverting 983cdae (I did not add a commit, but simply checked out the commit before that)

So on top of 6642ebc I get a build that seems to compile my simple test package across 8.4,8.6,8.8,8.10. But I have tested only the basic ghc non-crosscompile route, no ghcjs either.

For some reason I had to recompile all ghcs (not just 8.10). Maybe because the patch set got modified? I still was confused that there is a difference between current master and my branch. Not sure if there is a way to avoid that.

[maksbotan]

FYI: for me the issue with 0.6.1.0 missing (that is actually a hpc version) was fixed by adding hpc to bootPkgs at modules/component-driver.nix.

This is #524 all over again, because hpc bundled with 8.10 did not get uploaded to Hackage.

[angerman]

bors try

[iohk-bors]

try

Build succeeded

• buildkite/haskell-dot-nix
• ci/hydra:Cardano:haskell-nix:required