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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 infrastructure132 Servers

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2 Jun 2025
@sternenseemann:systemli.orgsternihm did wolfgang talk to anyone before the warnIf change?21:28:42
@sternenseemann:systemli.orgsternithe PR is pretty much what I wanted to do myself, but it's a pretty self merge in any case21:29:05
@sternenseemann:systemli.orgsternimaybe he has telepathic abilities :)21:29:13
@maralorn:maralorn.demaralornI know of nothing. 😄21:41:40
@maralorn:maralorn.demaralornSooo … what would an empty queue roughly look like? I guess 50k builds waiting for staging-next is not it? 😄22:44:26
@sternenseemann:systemli.orgsternithat's a question22:45:17
@sternenseemann:systemli.orgsterniI mean we can probably eval, we share most GHCs with staging-next22:45:35
@sternenseemann:systemli.orgsterniif it's a problem someone can always cancel an eval22:45:43
4 Jun 2025
@varikvalefor:matrix.orgla .varik. .VALefor. changed their profile picture.00:33:34
@alpm:matrix.orgAlp Mestanogullari joined the room.09:47:39
@sternenseemann:systemli.orgsternishenanigans… https://github.com/commercialhaskell/stackage/issues/776812:07:20
@sternenseemann:systemli.orgsterniover https://github.com/NixOS/nixpkgs/pull/41388512:19:57
@maralorn:maralorn.demaralorn sterni: Would you prefer all haskell-updates PRs to have that prefix? 12:21:03
@sternenseemann:systemli.orgsterniit doesn't really matter, I think it is more useful for other reviewers to immediately see that they can ignore it12:21:42
@sternenseemann:systemli.orgsternithough I think other commiters just ignore Haskell PRs based on the label as a general rule, so probably doesn't matter12:22:01
@sternenseemann:systemli.orgsterniyou don't need it for searching since base:haskell-updates works for that12:22:16
@sternenseemann:systemli.orgsterni Alex: https://hydra.nixos.org/build/299142554/nixlog/48 this is the race condition 12:35:29
@alexfmpe:matrix.orgalexfmpeshall we merge my aarch64-android-prebuilt and ucrt64 PRs this cycle? I rather not do more rounds of fixing nix-fmt conflicts https://github.com/NixOS/nixpkgs/pull/355543 https://github.com/NixOS/nixpkgs/pull/35774417:46:33
@alex:tunstall.xyzAlex
In reply to @sternenseemann:systemli.org
Alex: https://hydra.nixos.org/build/299142554/nixlog/48 this is the race condition

Seems simple enough to work around. PR soon.

(Do you know if upstream is interested in a fix for such an old version?)

18:53:09
@maralorn:maralorn.demaralorn
In reply to @alexfmpe:matrix.org
shall we merge my aarch64-android-prebuilt and ucrt64 PRs this cycle? I rather not do more rounds of fixing nix-fmt conflicts
https://github.com/NixOS/nixpkgs/pull/355543
https://github.com/NixOS/nixpkgs/pull/357744
I merged the one I had already approved. I haven't even heard of ucrt before. 😂
19:07:59
@alexfmpe:matrix.orgalexfmpethe good and/or bad news is that neither did I before I started working on it19:11:21
@alex:tunstall.xyzAlex
In reply to @sternenseemann:systemli.org
Alex: https://hydra.nixos.org/build/299142554/nixlog/48 this is the race condition

I think it never happens for the native builds because unlike cross they are full builds including HTML documentation and other stuff.

I'm inclined to make the fix not conditional on being cross.

19:37:52

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