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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/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org143 Servers

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2 Sep 2025
@wolfgangwalther:matrix.orgWolfgang Walther joined the room.12:10:07
@sternenseemann:systemli.orgsterni (he/him) bglgwyng: what does patched mean here? 12:11:25
@sternenseemann:systemli.orgsterni (he/him) Wolfgang Walther: hi :) 12:11:38
@bglgwyng:matrix.orgbglgwyng I did glib = callCabal2Nix ./glib-x.y.z {...} thing. I'm using haskell-flake so the code is different but the result would be so. 12:14:43
@sternenseemann:systemli.orgsterni (he/him)i guess you should first rule out that you have multiple gtk2hs-buildtools derivations in the build environment12:24:38
@aidalgol:tchncs.de@aidalgol:tchncs.de joined the room.21:56:50
3 Sep 2025
@ghpzin:envs.netghpzin joined the room.09:31:07
@gefla:aber.netGerd Flaig joined the room.20:55:18
4 Sep 2025
@epimonic:matrix.orgepimonic joined the room.00:36:54
@aidalgol:tchncs.de@aidalgol:tchncs.de changed their display name from Aidan Gauland to aidalgol[m].11:23:25
@aidalgol:tchncs.de@aidalgol:tchncs.de changed their display name from aidalgol[m] to aidalgol.11:24:11
@maralorn:maralorn.demaralornAh, yeah, users and their wishes. https://github.com/NixOS/nixpkgs/issues/190542#issuecomment-3253170725 Funny thing is I remember vividly how hard not having the newest version of anything would have annoyed me ten years ago. 😄11:52:17
@dandart:matrix.orgUraraka ~ OchacoAbsolutely a thing we would need so far to continue12:25:17
@emilazy:matrix.orgemilyok, how are you meant to go from an LLVM commit hash to the merge request that contains it?13:52:57
@emilazy:matrix.orgemilythe GitLab UI completely fails to show the link since they use a merge bot13:53:07
@qyliss:fairydust.spaceAlyssa RossLLVM? They use GitHub13:54:33
@emilazy:matrix.orgemilywhoops. sorry. GHC.14:05:13
@emilazy:matrix.orgemilyyou see, I am working with LLVM-related GHC patches :P14:05:28
@teoc:matrix.orgTeo (he/him)Do you have the commit?14:08:55
@teoc:matrix.orgTeo (he/him)* Could you share the commit SHA?14:09:10
@teoc:matrix.orgTeo (he/him)If you open the commit, you'll normally see back links at the bottom of the page from marge bot mentions14:10:19
@angerman:matrix.organgerman set a profile picture.21:15:40
@opna2608:matrix.orgPuna joined the room.21:21:56
5 Sep 2025
@Ericson2314:matrix.orgJohn EricsonIf anyone wants to help me debug https://github.com/haskell-nix/hnix-store/pull/289 that would be great. Just wishing aloud in case I'm lucky01:30:55
* @Ericson2314:matrix.orgJohn Ericson sleeps now01:31:03
@dmjio:matrix.org@dmjio:matrix.org left the room.02:09:38
@maralorn:maralorn.demaralornAaah, what is the point of having ghc-lib-parser spanning three ghc versions when fourmolu and ormolu track cabal-syntax anyway which is tightly coupled to the ghc release …12:16:17
@maralorn:maralorn.demaralornI have now the choice of downgrading ghc-lib-parser, fourmolu and ormolu to build hls on ghc 9.10 or to upgrade Cabal/Cabal-syntax. Both either globally or in a quite large overrideScope.12:17:35
@maralorn:maralorn.demaralornI feel like I am overlooking something because that didn’t feel as painful before …12:18:04
@artem.types:matrix.orgArtem maralorn: the very strict bounds that Ormolu puts on Cabal-syntax look strange. I'd ask on their bug tracker exactly the question you're posing above: if you use ghc-lib-parser, you probably want to span over at least couple of GHC, but you also always limit Cabal-syntax to one version, so this looks like mixed messages... They always bump Cabal-syntax when they bump ghc-lib-parser, so they at least understand some connection they just overly pessimistic about it it looks like. 15:10:21

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