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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/142 Servers

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18 Dec 2025
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org

given this dependency list, do you think i can get my binary smaller than 3.6MB?

base ^>=4.20.2.0,
aeson,
unordered-containers,
directory,
unix,
text,
bytestring,
filepath,
extra,
path,
microlens,
microlens-th,
microlens-mtl,
mtl,
transformers,
optparse-applicative,
bytestring-aeson-orphans,
template-haskell,
tree-diff,
exceptions,
hashable,
pretty,
Glob,
monad-logger,
No, most of that is already the GHC RTS.
16:15:33
@alex:tunstall.xyzAlex* No, most of that binary is already the GHC RTS.16:15:41
@magic_rb:matrix.redalder.orgmagic_rb👍16:25:03
19 Dec 2025
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@sternenseemann:systemli.orgsterni (he/him)ofc 9.14.1 releases when i leave the house without my laptop15:23:59
21 Dec 2025
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22 Dec 2025
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@magic_rb:matrix.redalder.orgmagic_rb how can i pass -Werror only in a Nix build? dont see a ghcFlags 21:54:45
@magic_rb:matrix.redalder.orgmagic_rb and buildFlags doesn't work 21:54:58
@maralorn:maralorn.demaralorn magic_rb: example here: https://github.com/maralorn/nix-output-monitor/blob/9a32f32f807a4f7bc97d95606465243f293650fe/flake.nix#L50 22:08:31
@magic_rb:matrix.redalder.orgmagic_rbThanks, i didnt think of passing it through cabal :D22:18:15
@maralorn:maralorn.demaralornI have no clue if this is the smartes solution.22:19:27
@magic_rb:matrix.redalder.orgmagic_rbHey if it works it works22:24:37
@magic_rb:matrix.redalder.orgmagic_rb It definitely wont be the dumbest/worst piece of the nix in the repo i want to put it in. I wrote that repos initial version years ago and boy was i an idiot 22:25:22
23 Dec 2025
@b:chreekat.netchreekatFun cabal fact: there's also a --ghc-options flag (with an s). Lets you put multiple, space separated ghc options in one go04:59:59
@magic_rb:matrix.redalder.orgmagic_rb the deps for microlens-mtl_0_2_1_1 are wrong, it pulls in microlens but it needs microlens_0_5_0_0 11:27:22
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org
the deps for microlens-mtl_0_2_1_1 are wrong, it pulls in microlens but it needs microlens_0_5_0_0
Nixpkgs does not do dependency solving.
Try overriding the haskell package set (see the Haskell section of the Nixpkgs manual).
15:33:07
@magic_rb:matrix.redalder.orgmagic_rbYeah i just overrode it manually for the deps, just kinda weird15:34:40
@magic_rb:matrix.redalder.orgmagic_rbThe versioned packages exist, but they dont depend on yeah other15:35:03
@b:chreekat.netchreekatI believe that all the versioned packages are just there because they can be with no guarantees17:06:45
@b:chreekat.netchreekat * 17:06:57
@magic_rb:matrix.redalder.orgmagic_rbFair fair, thought it was an oversight :)17:35:00
20 May 2021
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