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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 infrastructure138 Servers

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7 Nov 2025
@maralorn:maralorn.demaralorn* But it would also be kinda a breaking change. Who knows who relies on profiling builds.19:40:11
@Ericson2314:matrix.orgJohn Ericson srk ⚡️: I think the PR is finally working! 19:43:35
@Ericson2314:matrix.orgJohn Ericson(the hnix-store one)19:44:10
@alexfmpe:matrix.orgalexfmpe
In reply to @b:chreekat.net
Didn't I hear from mpickering in some talk recently that profiling mode is almost never what you want nowadays? You already get a bunch of great stuff "for free", and then when you want more you still don't usually want -fprof. I could be remembering this all wrong though
I'm told that nowadays you can also get flamegraphs without profiling builds
20:02:09
@Ericson2314:matrix.orgJohn Ericson alexfmpe: you don't have perms on that library do you? :) 20:04:21
@alexfmpe:matrix.orgalexfmpeHuh? Which lib20:08:28
@maralorn:maralorn.demaralornYes, but they are often relatively useless when not all your dependencies are compiled with -finfo-table-map.20:09:20
@Ericson2314:matrix.orgJohn Ericson hnix-store 20:45:10
@emma:rory.gay@emma:rory.gay left the room.22:39:32
9 Nov 2025
@giladwo:matrix.orggiladwo joined the room.11:41:19
@mangoiv.:matrix.orgMangoIV

Yeah I know. :/

A third output maybe? Build multiple ones? Compression also improves it. Did you try it out with compression?

11:55:29
@maralorn:maralorn.demaralornI didn’t.12:20:04
@maralorn:maralorn.demaralornI think the way to go would be to first figure out a way to provide a third output and then at some point default the profiling output to off and the info table output to on.12:21:05
@9hp71n:matrix.orgghpzin changed their display name from ghpzin to ghpzin (moved to @ghpzin:envs.net).15:04:04
10 Nov 2025
@sternenseemann:systemli.orgsternicompression likely means incorrect reference tracking13:23:14

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