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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://haskell4nix.readthedocs.io/143 Servers

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19 Sep 2025
@sternenseemann:systemli.orgsterniI feel like it’s possible yeah, especially since we can still fix stuff on staging18:42:37
@sternenseemann:systemli.orgsternishould maybe look at the broken list as of right now18:42:57
@wolfgangwalther:matrix.org@wolfgangwalther:matrix.orgAre you going to give the new blazing fast script a run or should I?18:43:37
@sternenseemann:systemli.orgsternifeel free to I’m obly on the phone at the moment18:44:27
@sternenseemann:systemli.orgsterni* feel free to I’m only on the phone at the moment18:44:34
@wolfgangwalther:matrix.org@wolfgangwalther:matrix.orgwill do.. and put it in a PR at first, so that we can just have a look for now.18:47:19
@maralorn:maralorn.demaralornI think I haven’t made it through all my packages. I think especially hls should really work on all versions. But it seems fair to put a bit pressure on that because I had enough time already.18:52:55
@wolfgangwalther:matrix.org@wolfgangwalther:matrix.orgI fixed some easy ones of yours yesterday, but not HLS :D18:53:50
20 Sep 2025
@wolfgangwalther:matrix.org@wolfgangwalther:matrix.orgList in https://github.com/NixOS/nixpkgs/pull/444422, we should merge before "either tonight or tomorrow", when staging-next will be created.09:59:00
@sternenseemann:systemli.orgsterniI’ll make a list of packages I’d want to fix on staging-next and then merge it later11:17:05
@maralorn:maralorn.demaralorn Wolfgang Walther: sterni Who wants to answer on https://github.com/NixOS/nixpkgs/issues/444721? I think the main point is that we will achieve the switch to 9.10 and have no blockers. Right? 19:10:34
21 Sep 2025
@bglgwyng:matrix.orgbglgwyngI found that 7479392276eede7c7cb89abf1693e8ef9ae5aebd fixed the issue05:25:55
@bglgwyng:matrix.orgbglgwyngbut it's just a stackage snapshot update, so there's a problem in my package override logic.05:26:22
@bglgwyng:matrix.orgbglgwyngI did 10+ python3, ghc build for 1 day bisecting between 60,000 commits lol05:27:01
@bglgwyng:matrix.orgbglgwyng

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

I build configured packages 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?

05:50:13
@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.org@wolfgangwalther:matrix.orgWe 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
@maralorn:maralorn.demaralornWould it make more sense then to merge it into haskell-updates to get more visibility whether it breaks any haskell packages?08:26:26

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