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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.org146 Servers

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13 Feb 2026
@alexfmpe:matrix.orgalexfmpe summon John Ericson 19:49:32
@Ericson2314:matrix.orgJohn Ericsonhi20:18:57
@Ericson2314:matrix.orgJohn Ericsonsee sandstone20:19:17
@Ericson2314:matrix.orgJohn Ericsongit@github.com:obsidiansystems/sandstone.git20:19:36
@sigmanificient:matrix.orgSigmanificientthe summoning ritual worked :D20:19:37
@Ericson2314:matrix.orgJohn Ericson* https://github.com/obsidiansystems/sandstone20:19:52
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14 Feb 2026
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@magic_rb:matrix.redalder.orgmagic_rbIt would be very cool if we could use dyndrv for haskell builds, hmm10:24:16
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15 Feb 2026
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16 Feb 2026
@magic_rb:matrix.redalder.orgmagic_rb

romes: The first Stage3 cross-compiler (i.e. a cross-compiled compiler) built by our CI:
https://gitlab.haskell.org/ghc/ghc/-/jobs/2421476/artifacts/browse
I'm testing it now.

They managed to get a riscv ghc crossed from im assuming x86. Could be used for bootstrap on our side 🎉

(Cross post from #GHC:matrix.org)

11:29:59
@alex:tunstall.xyzAlex We already have a working setup for native RISC-V via x86 cross (which I think is in the official Nixpkgs cache now?), but an official RISC-V build could make it less fragile.
But I suspect that the new compiler is only viable for the latest GHC, which would take a while to become the default GHC?
12:05:05
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17 Feb 2026
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18 Feb 2026
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19 Feb 2026
@woobilicious:matrix.orgwoobilicious what's the simplest way to bump a package version? sbv package is broken and that version is marked as deprecated upstream. I guess overrideSrc is best here? 04:26:53
@peddie:matrix.orgpeddieout of curiosity, isn't sbv usually broken because its golden tests hardcode what they expect to be emitted for the name/path of the SMT solver, but in nixpkgs it emits the full path rather than just the binary name? did he finally fix this upstream?04:40:41
@woobilicious:matrix.orgwoobiliciousNever used it before, so can't comment on it, wouldn't we want to just disable tests instead?04:43:53
@woobilicious:matrix.orgwoobiliciouswait hold up we have a newer verision but its called sbv_12 hmm04:50:17
@woobilicious:matrix.orgwoobiliciousbut that is also marked as broken lol04:52:16
@woobilicious:matrix.orgwoobiliciousnote the only suppposed working version on hackage is v13.504:53:04
@woobilicious:matrix.orgwoobiliciouswell, looks like the reason why our version is 11.7 is that that is what stackage lts uses.05:22:52
@woobilicious:matrix.orgwoobilicious peddie: you might be right there, we don't mark it dontCheck by the looks. checks are also extremely slow. I've disabled now because I'm impatient lol 05:33:03

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