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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.org145 Servers

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31 May 2025
@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.orgsterni (he/him)https://github.com/NixOS/nixpkgs/pull/41304621:38:25
@sternenseemann:systemli.orgsterni (he/him)We 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.orgsterni (he/him)maybe 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.orgsterni (he/him)probably just need to generalize the ld.gold mechanism, the question is of course why you'd do it.12:10:22
@sternenseemann:systemli.orgsterni (he/him)it'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.orgsterni (he/him)surely 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
@sternenseemann:systemli.orgsterni (he/him)that's true12:13:06
@sternenseemann:systemli.orgsterni (he/him)but are we sure that a mix of lld and ld.bfd across nixpkgs can play nice with C++ libs?12:13:27
@teoc:matrix.orgTeo (he/him)Yeah I'm not sure. Maybe the "correct" thing to do is just use lld consistently as the linker12:13:58
@teoc:matrix.orgTeo (he/him)I guess then you want to use clang as well? Otherwise you don't get LTO(?) I don't know how C/C++ linker stuff works12:15:02
@emilazy:matrix.orgemilymixing linkers is fine12:18:43
@emilazy:matrix.orgemilybut we probably won't want to use a different linker just for Haskell unless we need to12:18:56
@emilazy:matrix.orgemily OTOH both ld.gold and ld.bfd sort of suck for Linux to be on so maybe someone should make LLD happen system-wide :P 12:19:23

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