| 17 Mar 2026 |
 Alex | I'm in the middle of building b0515cbf9eb44508f90c8cf5b39654dd9af16b80.
It is currently at 537 derivations completed with no failures so far, so perhaps this version is OK? | 22:21:19 |
| 18 Mar 2026 |
 colemickens | and it seems like native ghc is still not a thing. I'm getting libffi errors when I try to crossPkgs it? #error "libffi was configured for a RISC-V target but this does not appear to be a RISC-V compiler." :'( | 01:47:06 |
| colemickens | I left this stuff behind almost 3 years ago. I definitely was naive and assumed native ghc would be here by now | 01:47:22 |
| Alex | It is possible to go via x86_64 cross and, if you're lucky, pkgsCross.riscv64.haskell.compiler.ghc94 will be in Nixpkgs cache (otherwise you'll need to copy it). | 01:48:58 |
| colemickens | oh, right, I switched by testing apparatus to a flake that has an older nixpkgs. I might need to bump and try again. | 01:49:54 |
| Alex |
I'm getting libffi errors when I try to crossPkgs it?
Can you share what exactly you're doing? It should just work. | 01:49:56 |
| colemickens | oh actually this is on nixos-unstable, one second, let me still bump it anyway and then I'll show you if it still errors | 01:50:33 |
| colemickens | okay I have this in a flake check attr and I'm just doing nix flake check in CI:
inputs.nixpkgs.legacyPackages.x86_64-linux.pkgsCross.riscv64.cachix. | 01:52:32 |
| Alex | Cross-compiling GHC and cross-compiling Haskell packages are two slightly different things.
[nixos@nixos:~]$ uname -a
Linux nixos 6.6.0 #1-NixOS SMP Tue Jan 1 00:00:00 UTC 1980 riscv64 GNU/Linux
[nixos@nixos:~]$ /nix/store/lcrs211p33jp89jm8a08m7d5vpi7533k-ghc-9.6.6/bin/ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.6.6
| 01:54:12 |
| colemickens | uh sorry I thought I sent a clarifying message, yes, I XY'd the problem a bit. | 01:55:07 |
| colemickens | I'm actually after cachix. Sorry, important context. | 01:55:16 |
| colemickens | * uh sorry I thought I sent a clarifying message (I definitely didn't from what I can see...), yes, I XY'd the problem a bit. | 01:55:38 |
| Alex | pkgsCross.riscv64.cachix evals for me on latest unstable. What commit of Nixpkgs is pinned in flake.lock? | 01:56:06 |
| colemickens | all the same, this is the derivation that fails: riscv64-unknown-linux-gnu-ghc-9.10.3 | 01:56:30 |
| colemickens | I updated so it's latest nixos-unstable. I also confirmed by tracing the nodes in flake.lock and it reports 5b2c2d84341b2afb5647081c1386a80d7a8d8605 | 01:57:47 |
| Alex | Do you have a reproducer that only requires the Nix CLI? | 01:59:33 |
| colemickens | I've just replaced my flake.{nix,lock}. Going to send it through the expensinve fat github runners to confirm output first, then I gist the flake.{nix,lock} | 02:08:46 |
| colemickens | okay, it reprod: https://gist.github.com/colemickens/78af9a28c01b888726322ca6628b27f5 | 02:12:22 |
| Alex | Oh sorry, I thought you were talking about an error during eval not during realisation.
Yes, I can definitely reproduce it now. | 02:24:15 |
| Alex | I've asked about it in #haskell:nixos.org.
I will see if I can fix it or at least track down the cause. | 02:29:37 |
 JamieMagee | I bumped into another issue while building OpenSSL
https://github.com/NixOS/nixpkgs/pull/501061 | 16:07:37 |
 dramforever | what platform is this? are you building on qemu-user? | 16:32:17 |
| JamieMagee | Yes, it's on QEMU | 16:32:44 |
| dramforever | the binfmt thing, right? | 16:36:27 |
| dramforever | i don't think i can in good conscience accept this. so many packages fail tests in qemu-user that we'll keep adding these, until the real riscv machine gets good then these would be obsolete | 16:40:52 |
| dramforever | * | 16:41:04 |
| dramforever | as an example, a good while back even coreutils fails tests under qemu-user | 16:41:20 |
| dramforever | a while back i wrote a hydra hack to schedule builds based on derivation meta | 16:43:15 |
| dramforever | it still needs some weird extra hacks on top but it avoids changing hash | 16:43:32 |
| dramforever | https://github.com/dramforever/hydra/tree/description-feature-hack | 16:44:16 |
