 | Haskell in Nixpkgs/NixOS | 717 Members |
| 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.org | 143 Servers |
| Sender | Message | Time |
|---|---|---|
| 20 Oct 2025 | ||
 sterni (he/him) | In reply to @raboof:matrix.org* did you measure performance impact? | 07:00:28 |
| sterni (he/him) | In reply to @raboof:matrix.org* yes, dynamically linking executables means excessively large closure sizes | 07:01:25 |
 Alex | In reply to @sternenseemann:systemli.orgAs usual, separate outputs would be nice but potentially require a lot of effort to implement. :s | 08:17:03 |
| 21 Oct 2025 | ||
 50^2 changed their profile picture. | 04:51:49 | |
 @le:4d2.org left the room. | 10:36:16 | |
 eldritchcookie | is cabal2nix not aware of build-tools-depends or do i need to blame flake-parts's haskell-flake? | 21:57:25 |
 Artem | eldritchcookie: the latter I think | 23:13:21 |
| Artem | * eldritchcookie: the former I think | 23:13:25 |
| Artem | * eldritchcookie: the former I think (not aware) | 23:13:33 |
| eldritchcookie | i did some digging and actually calling cabal2nix on my cabal package has an output which contains TestToolDepends = [tasty-discover]; so somebody is dropping that and it certainly isnt cabal2nix | 23:17:22 |
| 22 Oct 2025 | ||
 raboof | for 'these' it does seem slower, but in the order of 'tens of milliseconds' on an ~11-second build. I tried a more substantial package (hoogle), that was about 2 seconds slower for a 46-second build (averages across 4 builds each). So measurable impact (but promising to see it did seem to have the desired effect for hoogle as well)... | 10:39:44 |
 magic_rb | hm, im getting this from nixpkgs: weird | 20:24:03 |
| magic_rb | its an interesting failure, very, not helpful | 20:24:57 |
| 23 Oct 2025 | ||
 alexfmpe | might want to try 9.12 from recent nixpkgs | 17:23:06 |
| alexfmpe | pkgsCross.ghcjs.haskell.packages.ghc912 has cached miso and reflex-dom, which means a lot of other packages are also cached by being their deps | 17:23:38 |
| alexfmpe | I get nix-build -A pkgsCross.ghcjs.haskell.packages.ghc912.ghcjs-base from cache on https://github.com/NixOS/nixpkgs/commit/c90b7f75f4e9d4dffcdc30261f565da1e261d468 which is just a few days old | 17:26:32 |
| alexfmpe | magic_rb: ^ | 17:26:42 |
 Uraraka ~ Ochaco | I kind of gave up with ghcjs when it started giving cryptic errors so I moved my stack over to wasm | 17:27:18 |
| alexfmpe | js backend is recent enough I wouldn't bother much with anything older than 9.12 | 17:27:21 |
| alexfmpe | but yeah, wasm is very much an option | 17:27:59 |
| alexfmpe | funnily enough eval of this is broken on master and on present haskell-updates, looks like something got merged very recently | 17:28:51 |
| alexfmpe | | 17:30:22 |
| alexfmpe | yay | 17:30:26 |
| alexfmpe | bisect was pretty quick: this broke eval: https://github.com/NixOS/nixpkgs/pull/366593 | 17:39:01 |
| alexfmpe | somehow we're getting a ghcjs -> emscripten -> openjdk -> python -> openssl that ends up trying to eval stdenv.cc.isGnu that then throws because there's no c compiler | 17:51:32 |
| magic_rb | In reply to @alexfmpe:matrix.orgmhm i actully figured it out, but i had to apply https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14882 but using sed | 17:54:57 |
| magic_rb | had to add both HEAP8 and HEAPU8 | 17:55:12 |
| alexfmpe | ah ok, keep in mind I 'backported' that last week | 17:58:28 |
| alexfmpe | https://github.com/NixOS/nixpkgs/pull/451527 | 17:58:28 |
| magic_rb | ah, good to know | 18:47:06 |