| 20 Mar 2026 |
 alexfmpe | https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14996 | 23:19:44 |
 Alex | Adding -lffi did not work. Somehow none of the library-dirs in rts-*.conf seem to be used; Haskell package builds fail with "error: cannot find -lffi".
It's no surprise that they're changing the libffi handling soon, this is difficult to hack around. | 23:59:52 |
| 21 Mar 2026 |
| alexfmpe | I did PR a bump to ghcHEAD precisely to see if it affected the cross libffi shenanigans | 00:24:50 |
| alexfmpe | but iserv-proxy doesn't build with it yet | 00:25:07 |
| alexfmpe | maybe we just merge your PR as is and revisit when we can test cross on 10.0? | 00:35:21 |
| alexfmpe | * maybe we just merge your PR as is and revisit when we can test cross properly on 10.0? | 00:35:37 |
| alexfmpe | I also have no idea how the on-demand interpreter will shake things | 00:35:47 |
 woobilicious | Lol I got almost no where so far, converting a monomorphic C interface to a typesafe hetrogenous list type is way too complex for my puny brain. | 05:07:12 |
 sterni (he/him) | teo (they/he): do you know whether there is already a GHC issues w.r.t. handling of system gmp/libffi in a cross context? I think a fundamental problem in GHC is that it assumes that the same (system) libffi and gmp flags can be passed during every stage, but when e.g. building a cross compiler, stage0 would need to use a different version of those libraries which has been built for the build platform. | 13:59:16 |
| sterni (he/him) | I assume that the in tree gmp/libffi handle this just fine since it's recompiled for every stage (?) | 13:59:54 |
| sterni (he/him) | One option I see would be to build stage0 without libffi and gmp altogether if that's possible | 14:00:54 |
| sterni (he/him) | In any case, context is that I'm currently patching the system libffi handling slightly to special-case stage0 and I want to at least reference some issue, so would be good to have something related already, but can also open a new one. | 14:02:28 |
| sterni (he/him) | Not sure if the patch would be upstreamable though I suspect that --with-system-* does not work when building a cross compiler with anything but Nix and with Nix it's sometimes broken if the headers are platform specific (i.e. libffi). | 14:03:17 |
| sterni (he/him) | * Not sure if the patch would be upstreamable though I suspect that, currently, --with-system-* does not work when building a cross compiler with anything but Nix and with Nix it's sometimes broken if the headers are platform specific (i.e. libffi). So maybe it would be a net positive. | 14:03:39 |
|  @galileocharonvostok1:matrix.org joined the room. | 14:53:20 |
| @galileocharonvostok1:matrix.org left the room. | 14:54:10 |
| sterni (he/him) | alexfmpe: Alex: https://github.com/NixOS/nixpkgs/pull/501983 so this is my idea, just letting cc wrapper deal with stage0 (since we're in stdenv anyways) | 16:30:59 |
| sterni (he/him) | gonna clean that up, patch doesn't seem too terrible to maintain, may even be upstreamable in some shape or form | 16:31:27 |
 Teo (he/him) | I'm not sure if there's an existing issue. Creating one sounds great! https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15231 might cover this but I'm not sure.
Even if it's just nix specific it would be good to have it upstream since then we'd be less likely to break downstream all the time.
| 16:53:41 |
| 24 Mar 2026 |
| alexfmpe | do we have any idea what causes the rts configure error mentioned in
https://github.com/NixOS/nixpkgs/pull/482251#issuecomment-3779413252 | 18:25:28 |
| alexfmpe | I also hit it for s390x | 18:25:33 |
| alexfmpe | * affects some powerpc variants, i686, s390x | 18:25:59 |
|  @libjared:matrix.org left the room. | 21:26:45 |
| 26 Mar 2026 |
 aiya | say I wanted to fix a C++ lib that is relevant for a haskell package (i.e. fix libtorch to fix libtorch-ffi), would that be done in the haskell-updates branch or another branch? | 17:18:26 |
| alexfmpe | Usually haskell-updates is for LTS bump related shenanigans. If your error is present on master and can be fixed there, usually that's what you want | 17:27:14 |
| alexfmpe | Unless it causes mass rebuilds, then it goes on staging | 17:27:34 |
| aiya | i don't understand, i thought haskell-updates was for all Haskell package changes? | 17:28:00 |
| aiya | * i don't understand, i thought haskell-updates was for all Haskell package changes? or are you specifically talking about non-haskell packages | 17:28:09 |
| 20 May 2021 |
|  @grahamc:nixos.org set the history visibility to "world_readable". | 22:10:58 |
| @grahamc:nixos.org changed the room name to "" from "". | 22:10:58 |
