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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/140 Servers

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4 Aug 2025
@sternenseemann:systemli.orgsterni teo (they/he): I mean what you could put on your GHC review pile is my never reviewed MR :p https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13932 16:30:06
@teoc:matrix.orgTeo (he/him)Will do! Feel free to tag me in the future too. It's a real shame that that slipped through the cracks16:31:20
@teoc:matrix.orgTeo (he/him)I hadn't realized you were already trying to build a stage2 compiler for these configurations. I know that isn't supported in hadrian in general and that's being fixed in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/11444. But maybe it would be supported in this case and something is just going wrong with this flag. I'll look into it and see if there's an easy fix16:33:24
@sternenseemann:systemli.orgsterni I was convinced it worked, but when I checked the log I saw that only ghc the library is built in _build/stage1/compiler just before it finishes. Checking ghc --info revealed that it's indeed just Stage1 :( 16:48:18
@teoc:matrix.orgTeo (he/him)Ah annoying!16:56:45
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️Is it possible to ignore specific testcases when packaging a Haskell package, instead of disabling all the tests with dontCheck? With overrideCabal?19:03:10
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️Found a solution, modify testFlags through overrideCabal21:09:34
5 Aug 2025
@mrcjk:matrix.orgMarc Jakobi I think I've narrowed the high memory consumption down to the use of inline-python's marshalling functions (fromPy, ...).
Will investigate further...
06:59:22
@mrcjk:matrix.orgMarc JakobiIt's not inline-python either. But I can work around it by disabling library profiling, which probably explains why I wasn't able to reproduce it outside of nix.09:48:07
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@mrcjk:matrix.orgMarc JakobiIt's a combination of library profiling + template haskell in large modules (500 LOC). Please don't ask me why we have modules with ~500 LOC πŸ™ˆ13:39:15
@magic_rb:matrix.redalder.orgmagic_rb500 loc is not that much? Id think13:39:53
@magic_rb:matrix.redalder.orgmagic_rbIf you said 5000loc then sure13:40:00
@mrcjk:matrix.orgMarc JakobiI don't know how much the TH is adding to those lines13:44:38
@magic_rb:matrix.redalder.orgmagic_rbAh right, lots of TH13:44:56
@teoc:matrix.orgTeo (he/him)You can use https://downloads.haskell.org/ghc/latest/docs/users_guide/debugging.html#ghc-flag-ddump-splices if you want to see the stuff TH outputs14:07:00
@sternenseemann:systemli.orgsterniyou should also probably try to figure out whether GHC or the linker is the problem14:44:05
6 Aug 2025
@mikelpr:matrix.orgMikel PΓ©rez changed their profile picture.02:53:36
7 Aug 2025
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8 Aug 2025
@0x4a6f:nixos.dev0x4A6F joined the room.06:54:24
@sternenseemann:systemli.orgsterni teo (they/he): is there an issue alreday for the issue that finalStage = Stage2 is silently ignored? 10:06:06
@teoc:matrix.orgTeo (he/him) Not as far as I know. it would be good to make one 10:07:18
@teoc:matrix.orgTeo (he/him)even if there is one, it would put it back on folks' radar10:07:32
@sternenseemann:systemli.orgsternihttps://gitlab.haskell.org/ghc/ghc/-/issues/2628910:45:58
@sternenseemann:systemli.orgsternilet's try this again https://discourse.nixos.org/t/call-for-contributions-we-are-updating-to-ghc-9-10-2/67756 (lmk about any typos)11:36:01
@sternenseemann:systemli.orgsternifunny that we did 9.2, 9.4, 9.6 and 9.8 without ever posting on discourse11:36:26
@sternenseemann:systemli.orgsternithough 8.10 -> 9.0 truly was the big one11:36:36
@sternenseemann:systemli.orgsterni I'm a bit concerned people will be scared away by this wall of text, but I'm the wrong person to write a short post. Also documentation on contributing to haskellPackages is really spotty. 11:38:41
@sternenseemann:systemli.orgsterniThe short intro I wrote (and copied here) for 9.0.2 post is kinda good, maybe we should just put that in the Nixpkgs manual as a starting point.11:39:11

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