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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/146 Servers

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28 Aug 2025
@maralorn:maralorn.demaralornWell, I’ll take the opportunity and join that room now.20:30:46
@sternenseemann:systemli.orgsterni (he/him)llvm-ffi 21.0.0.2 should support LLVM 21 proper20:33:42
@emilazy:matrix.orgemily we don't have that on master, though 20:34:33
@sternenseemann:systemli.orgsterni (he/him)Either bump it manually until the upgrade trickles through via haskell-updates or remove the warning as long as the build doesn't break either should work.20:34:57
@emilazy:matrix.orgemilywe could cherry-pick it but it feels dubious for updating an LLVM off an rc to get blocked on this when we haven't even bumped the default version yet20:35:01
@sternenseemann:systemli.orgsterni (he/him)yes20:35:27
@sternenseemann:systemli.orgsterni (he/him)I wrote that code when LLVM default was a few versions back, seems like now where it's practically latest we could also sync it with the default version20:36:03
@sternenseemann:systemli.orgsterni (he/him)instead of latest available20:36:07
@Las:matrix.orgLas changed their profile picture.20:36:52
@emilazy:matrix.orgemilyright20:36:55
@emilazy:matrix.orgemilywe should be defaulting to LLVM 21 for 25.11, hopefully20:37:39
@Las:matrix.orgLas removed their profile picture.20:40:53
@artem.types:matrix.orgArtem
In reply to @sternenseemann:systemli.org
Thibaut: we are updating to the latest version of dhall as part of https://github.com/NixOS/nixpkgs/pull/429810. We could use some help fixing build failures in the dhall-related packages: https://hydra.nixos.org/eval/1818002?filter=dhall&compare=1817909&full=
I took a brief look at the hydra log linked. I only saw logs for three failed jobs and from those one is the text/show issue and another one is too strict upper bound on data-defaylt that was PRed recently but has no progress in merging :-( i pinged them on that PR: https://github.com/dhall-lang/dhall-haskell/pull/2659#issuecomment-3234999428
21:37:33
@thibaut:fsl.shThibaut I think adding a data-default == 0.7.1.3 and adding it to the failed packages' override could work, I'm checking on dhall-lsp-server 21:41:02
@thibaut:fsl.shThibautRedacted or Malformed Event23:15:20
@thibaut:fsl.shThibautit's not enough23:15:42
29 Aug 2025
@luna-null:matrix.org@luna-null:matrix.org left the room.02:40:19
@zeorin:matrix.org@zeorin:matrix.org left the room.07:03:56
@sternenseemann:systemli.orgsterni (he/him)downgrading data-default is not a good option anyways since it is likely to cause issues elsewhere10:41:45
@sternenseemann:systemli.orgsterni (he/him)We can do the bound adjustment via patches/overrides as well, we don't need to wait for upstream10:43:00
@dandart:matrix.orgEmber VoidUghh I've had terrible trouble with data-default-class vs data-default. Had to update bounds for another package because of the incompatible update.10:58:40

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