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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://nixos.org/manual/nixpkgs/unstable/#haskell | Current PR: https://github.com/nixos/nixpkgs/pulls?q=is%3Apr+is%3Aopen+head%3Ahaskell-updates | Maintainer Docs: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/HACKING.md | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org | Merger Schedule: https://cloud.maralorn.de/apps/calendar/p/H6migHmKX7xHoTFa/dayGridMonth/now | Join #haskell.nix:libera.chat for question about the alternative haskell.nix infrastructure136 Servers

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21 Sep 2025
@bglgwyng:matrix.orgbglgwyng *

https://github.com/bglgwyng/nix-x-cabal/blob/main/modules/cabal-project.nix#L181

I build configured packages in plan.json and put them into the package db by using ghcWithPackage.
Is is safe way to do it? Do we have a more lower level function to build package db?

05:50:22
@wolfgangwalther:matrix.orgWolfgang WaltherWe had planned to look at Template Haskell in pkgsStatic for this release cycle and I feel that we really shouldn't push this out much further. The gap between pkgsStatic with GHC 9.4 and default with GHC 9.10 is widening now. I think we should discuss how to proceed here first, before deciding on whether we have any blockers or not.07:46:43
@maralorn:maralorn.demaralornI just tried to run nixpkgs-review unix2dos PR and got 23k builds. I feel like I am holding it wrong.08:17:58
@opna2608:matrix.orgPunaif you're using local evaluation to get the list of rebuilds, try applying this patch: https://github.com/Mic92/nixpkgs-review/commit/558b6d4da3032bb43c396d6042c41681ac2b940808:22:09
@sternenseemann:systemli.orgsterni maralorn: sounds about right 08:23:02
@maralorn:maralorn.demaralornOkay. I mean, I don’t think we can realistically hold-up the release so this would be more like setting ourselves a deadline. I have no stakes in pkgsStatic I don’t know much about the current problem and I don’t use it. But if there is a way forward to fix it I would of course like that to happen.08:23:52
@maralorn:maralorn.demaralornI see. Then I was just … naive.08:24:05

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