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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/138 Servers

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30 May 2025
@jean-paul.:matrix.orgjean-paul.One hack I see is to manually set "checkPhase" so it does nothing and set the other options as you would normally set them to build & run the tests12:57:05
@maralorn:maralorn.demaralornYay, staging moved to staging-next. Soon we can work on haskell-updates again.17:34:47
@alexfmpe:matrix.orgalexfmpeAh finally18:02:57
31 May 2025
@peterbecich:matrix.orgPeter Becich
./maintainers/scripts/haskell/regenerate-hackage-packages.sh

I believe is broken on staging, staging-next and haskell-updates. The first error in the output is:

error: builder for '/nix/store/xwayf8wqkcdxfma8apqhprgih1khk2d5-python3.13-beautifulsoup4-4.13.4.drv' failed with exit code 1;

would someone confirm this for me?

02:09:59
@peterbecich:matrix.orgPeter Becich created issue for beautifulsoup: https://github.com/NixOS/nixpkgs/issues/412556 02:34:15
@ethancedwards8:matrix.orgethancedwards8 joined the room.02:54:09
@peterbecich:matrix.orgPeter Becich Cherry pick beautifulsoup fix to haskell-updates, review please: https://github.com/NixOS/nixpkgs/pull/412733 18:46:35
@peterbecich:matrix.orgPeter BecichIs there an @ofborg command to add a label?18:51:19
@maralorn:maralorn.demaralorn @peterbecich:matrix.org thanks for the fix. However this breakage only happened because there was an accidental merge of staging into haskell-updates. We decided to resume work on the branch once that staging reaches master. Then we can merge master into haskell-updates. 20:09:47
@maralorn:maralorn.demaralorn * @peterbecich:matrix.org thanks for the fix. However this breakage only happened because there was an accidental merge of staging into haskell-updates. We decided to resume work on the branch once that staging reaches master. Then we can merge master into haskell-updates. Receiving all the fixes. 20:10:41
1 Jun 2025
@sternenseemann:systemli.orgsternihttps://github.com/NixOS/nixpkgs/pull/41304621:38:25
@sternenseemann:systemli.orgsterniWe need to resolve eval issues and can look into starting an eval tomorrow or in the next days, depending on how full the x86_64-linux queue is.21:49:12
@mjolnir:nixos.orgNixOS Moderation Bot unbanned @mightyiam:matrix.org@mightyiam:matrix.org.22:58:02
@seanthw:matrix.orgSean Thawe joined the room.23:39:39
2 Jun 2025
@maralorn:maralorn.demaralornUh, why is pandoc pinned to 3.6 in stackage?11:04:25
@maralorn:maralorn.demaralornWe have a test error for pandoc on haskell-updates and it is fixed in 3.6.4.11:04:48
@maralorn:maralorn.demaralornBut apparently we are already backporting 2 patches for that one test … Lets make it 3. 😄11:08:38
@sternenseemann:systemli.orgsternimaybe newer pandoc no longer has a valid install plan with stackage lts11:58:31
@maralorn:maralorn.demaralornYes, that is likely it.12:07:32
@teoc:matrix.orgTeo (he/him)Is there an easy way to configure the nixpkgs haskell infra to use lld as the linker? I'm currently working on adding support to haskell.nix for this and once I'm done with that I'd be keen to do the same for nixpkgs if it doesn't already exist12:08:39
@sternenseemann:systemli.orgsterniprobably just need to generalize the ld.gold mechanism, the question is of course why you'd do it.12:10:22
@sternenseemann:systemli.orgsterniit's already kind of silly to use gold as a one off in haskellPackages12:11:10
@teoc:matrix.orgTeo (he/him)Basically cause gold is being deprecated and also lld is better apparently12:11:23
@teoc:matrix.orgTeo (he/him)Yeah I think it's kind of a conceptual mess how this all works12:11:33
@sternenseemann:systemli.orgsternisurely the ld.bfd bug that was plaguing haskell has been fixed by now?12:11:55
@teoc:matrix.orgTeo (he/him)I think the big issue with ld.bfd is that it is horribly slow12:12:16
@teoc:matrix.orgTeo (he/him)At least given the huge object files that GHC outputs12:12:51

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