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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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15 Jun 2025
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16 Jun 2025
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17 Jun 2025
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19 Jun 2025
@setunset:matrix.orgFreeVariableIs it possible to get ghc 9.10.2 on Nixos unstable?01:28:10
@setunset:matrix.orgFreeVariableThe last packaged versions seems to be 9.8.x01:28:47
@cdepillabout:matrix.orgcdepillabout GHCs are available as haskell.compiler.ghc910*, and the package sets at haskell.packages.ghc910*.lens (or whatever). Although keep in mind that sometimes things don't work with the non-default compiler. 02:46:18
@setunset:matrix.orgFreeVariable
In reply to @cdepillabout:matrix.org
GHCs are available as haskell.compiler.ghc910*, and the package sets at haskell.packages.ghc910*.lens (or whatever). Although keep in mind that sometimes things don't work with the non-default compiler.
Thanks. But how large is th delta ?How many versions I can expect to be available when they are not yet released to the unstable branch?
06:58:05
@setunset:matrix.orgFreeVariable* Thanks. But how large is the delta? How many versions I can expect to be available when they are not yet released to the unstable branch?06:58:27
@maralorn:maralorn.demaralorn
In reply to @setunset:matrix.org
Thanks. But how large is th delta ?How many versions I can expect to be available when they are not yet released to the unstable branch?
I am unsure what you mean. Do you wonder how many less haskell packages build on the non default ghc? Hard to say.
07:22:35
@maralorn:maralorn.demaralornBut we have all recent ghc versions packaged including 9.12.07:23:33
@maralorn:maralorn.demaralornThey are all "released" in the sense that they exist on nixos-stable. They just are not yet defaults.07:24:42
@alexfmpe:matrix.orgalexfmpea lot of packages build with 9.12 out of nixpkgs notably, both HLS and reflex-dom do and they have massive dependency footprints08:15:49
@alexfmpe:matrix.orgalexfmpealso, while the compiler is cached, the package set itself isn't, so the first build will be annoying08:16:08
@setunset:matrix.orgFreeVariable
In reply to @alexfmpe:matrix.org
also, while the compiler is cached, the package set itself isn't, so the first build will be annoying
Makes sense. Thanks!
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20 Jun 2025
@m1-s:matrix.orgm1-s

I am getting these compiler errors on aarch64-darwin after upgrading to ghc 9.8.4

       > /private/tmp/nix-build-my-package-0.0.0.drv-2/ghc39648_0/ghc_2167.s:8135994:2: error:
       >      error: fixup value out of range
       >             cbnz x17, Lc3HV0l
       >             ^
       >         |
       > 8135994 |         cbnz x17, Lc3HV0l
       >         |  ^
       >
       > /private/tmp/nix-build-my-package-0.0.0.drv-2/ghc39648_0/ghc_2167.s:8136336:2: error:
       >      error: fixup value out of range
       >             b.hi Lc3HV1y
       >             ^
       >         |
       > 8136336 |         b.hi Lc3HV1y
       >         |  ^
       >
       > <no location info>: error:
       >     `cc' failed in phase `Assembler'. (Exit code: 1)

It compiles on x86-linux. Anyone seen this before?

22:13:43
21 Jun 2025
@sternenseemann:systemli.orgsterniLooks like https://gitlab.haskell.org/ghc/ghc/-/issues/23746, but should be fixed in 9.8.4 iirc11:05:12

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