| 3 Jun 2021 |
 Roos | ghc802 missing means that compiler version (I'm guessing 8.02) is not available in the nixpkgs available in NIX_PATH. | 06:03:23 |
| Roos | You may want to take a look at pkgs/top-level/haskell-packages.nix to see the supported ghc versions. | 06:04:30 |
 ahdyt | Yeah it's also unavailable in nixpkgs, cause it's too old, my ghc is 8.10 | 06:04:51 |
| ahdyt | So how to "fix" this missing ghc? Updating the Stack.yaml? | 06:05:40 |
| Roos | From what I can see, ghc865 seems to be the oldest available compiler. | 06:05:42 |
| Roos | In reply to @ahdyt:matrix.org
So how to "fix" this missing ghc? Updating the Stack.yaml? Yes, that is an alternative. | 06:05:57 |
| Roos | It is also possible to build with an older version of nixpkgs, but be ready to download the world :D | 06:06:54 |
 cdepillabout | ahdyt: You generally have two options:
- Specify an older channel as Roos suggests (
stack --nix-path nixpkgs=https://github.com/NixOS/nixpkgs/archive/8c2447fdee1af9310367b1ad7b63aed6217d3445.tar.gz build)
- Write a
stack-shell.nix file: https://docs.haskellstack.org/en/stable/nix_integration/#using-a-custom-shellnix-file
| 06:09:20 |
| Roos | cdepillabout: How would you go about finding a nixpkgs version that contains a given compiler? | 06:10:02 |
| cdepillabout | * ahdyt: You generally have two options:
- Specify an older channel that contains ghc802 as Roos suggests (
stack --nix-path nixpkgs=https://github.com/NixOS/nixpkgs/archive/8c2447fdee1af9310367b1ad7b63aed6217d3445.tar.gz build)
- Write a
stack-shell.nix file: https://docs.haskellstack.org/en/stable/nix_integration/#using-a-custom-shellnix-file
| 06:10:04 |
| Roos | git grep is heavy :D | 06:10:21 |
| cdepillabout | Roos: That's a lot trickier. Generally I just try old channels until I find something that works: https://status.nixos.org/ | 06:11:05 |
| cdepillabout | Although 8.0 is pretty old at this point, I imagine nixos-19.09 might not have it. I guess you could try the release-19.03, release-18.09, etc branches on github. | 06:12:10 |
| cdepillabout | You could in theory also search Hydra, but in practice that doesn't work for me. | 06:14:31 |
| cdepillabout | This times out for me: https://hydra.nixos.org/search?query=ghc802 | 06:15:01 |
|  bqv changed their display name from bqv to qy. | 06:15:26 |
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| Roos | Offtopic: what kind of db backs hydra? | 06:15:50 |
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| cdepillabout | My guess is that they have hired a guy who physically writes things down with paper and pencil. | 06:17:31 |
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