| 1 Nov 2025 |
 connor (he/him) | Manual NVCC? | 04:00:59 |
 SomeoneSerge (matrix works sometimes) | Like we had buildInputs = [ nvcc ] in a bunch of places because of the host_config.h dependency | 04:03:40 |
| SomeoneSerge (matrix works sometimes) | Which will not have been needed if cudart propagates it | 04:03:57 |
| connor (he/him) | I don’t remember honestly
I think I also had it propagate because headers need to be in buildInputs to be discovered | 04:05:08 |
| connor (he/him) | I just looked through the commits for the CUDA 13 PR; I didn't see removal of nvcc from buildInputs anywhere | 04:13:19 |
| SomeoneSerge (matrix works sometimes) | Aight this may well be my favourite Halloween story so far, and still open-ended: https://github.com/NixOS/nixpkgs/pull/457424#issuecomment-3475742510 | 04:17:14 |
| SomeoneSerge (matrix works sometimes) | I can't explain this | 04:19:45 |
| SomeoneSerge (matrix works sometimes) | No way | 04:19:48 |
| connor (he/him) | can you imagine if it's non-deterministic | 04:24:09 |
| connor (he/him) | or only occurs if there are multiple capabilities | 04:24:16 |
| connor (he/him) | I mean I was able to reproduce with a single capability | 04:24:54 |
| SomeoneSerge (matrix works sometimes) | Yeah. If I were to try to explain it, I'd start checking if they e.g. try to copy CUDAToolkit_INCLUDE_DIRS or any other FindCUDAToolkit's targets' properties into their own targets | 04:31:09 |
| connor (he/him) | For what it's worth, I looked through the tree and here are the packages I found where cuda_nvcc ends up in buildInputs in some way. This list doesn't include other way it could end up in the closure -- string interpolation, environment variables, cmakeFlags, etc.
- ./pkgs/by-name/ba/basalt-monado/package.nix
- ./pkgs/by-name/dl/dlib/package.nix
- ./pkgs/by-name/fr/frei0r/package.nix
- ./pkgs/by-name/gp/gpu-burn/package.nix
- ./pkgs/by-name/ka/katago/package.nix
- ./pkgs/by-name/ko/koboldcpp/package.nix
- ./pkgs/by-name/ma/mathematica/generic.nix
- ./pkgs/by-name/mf/mfaktc/package.nix
- ./pkgs/by-name/mo/monado/package.nix
- ./pkgs/by-name/xm/xmrig-cuda/package.nix
- ./pkgs/by-name/xm/xmrig-cuda-mo/package.nix
- ./pkgs/development/cuda-modules/packages/cuda_cudart.nix
- ./pkgs/development/cuda-modules/packages/nccl.nix
- ./pkgs/development/libraries/ffmpeg/generic.nix
- ./pkgs/development/python-modules/causal-conv1d/default.nix
- ./pkgs/development/python-modules/cupy/default.nix
- ./pkgs/development/python-modules/jaxlib/default.nix
- ./pkgs/development/python-modules/lightgbm/default.nix
- ./pkgs/development/python-modules/mamba-ssm/default.nix
- ./pkgs/development/python-modules/tensorflow/default.nix
- ./pkgs/development/python-modules/torch/source/default.nix
- ./pkgs/development/python-modules/warp-lang/default.nix
| 04:32:50 |
|  @eveeifyeve:matrix.org joined the room. | 04:47:07 |
| @eveeifyeve:matrix.org | A good question does cuda_cccl include thrust/context.h because with hydra it's receiving a lot of errors saying it's missing for pytorch.
https://hydra.nixos.org/build/311450648/log | 04:47:31 |
| @eveeifyeve:matrix.org | I am trying to build pytorch right now. | 04:47:44 |
| SomeoneSerge (matrix works sometimes) | $ nix-build '<nixpkgs>' --arg config '{allowUnfree = true;}' -A cudaPackages.cuda_cccl.dev
$ readlink result-dev
/nix/store/yvvs83nys6i78fq1p5dgliqlhlk2svq0-cuda_cccl-12.8.90-dev
$ ls result-dev/include/thrust/context.h
ls: cannot access 'result-dev/include/thrust/context.h': No such file or directory
| 05:37:53 |
| @eveeifyeve:matrix.org | This effects building pytorch. | 05:39:49 |
| @eveeifyeve:matrix.org | * This effects building pytorch which is will be a major blocker for zero builds hydra 25.11. | 05:41:36 |
| SomeoneSerge (matrix works sometimes) | Perhaps Gaétan Lepage's looked into this? | 05:46:57 |
| SomeoneSerge (matrix works sometimes) | In any case, see you tomorrow | 05:47:21 |
| @eveeifyeve:matrix.org | I might try to debug this. Because I am happy to. | 05:53:52 |
| @eveeifyeve:matrix.org | It's complex.h sorry.. | 06:00:31 |
| @eveeifyeve:matrix.org | It's there, but idk something werid about pytorch package. | 06:01:30 |
| @eveeifyeve:matrix.org | https://github.com/NixOS/nixpkgs/issues/457456 | 06:02:36 |
 Gaétan Lepage | In reply to @eveeifyeve:matrix.org
A good question does cuda_cccl include thrust/context.h because with hydra it's receiving a lot of errors saying it's missing for pytorch.
https://hydra.nixos.org/build/311450648/log I am aware that torchWithRocm is broken. I mentioned it to @lt1379:matrix.org a few days ago. | 09:02:40 |
| Gaétan Lepage | The regular pytorch builds fine AFAIK | 09:03:36 |
|  leona joined the room. | 09:15:42 |
 Lun | Tracked it down to USE_FBGEMM_GENAI doing some hacky things with hip flags, will have a PR up soon if that was the only build issue.
(Just turning it off, it's some specialized quantized kernels for one ISA only right now so really doesn't seem worth trying to fix the jank) | 18:55:34 |
| Gaétan Lepage changed their profile picture. | 22:52:58 |
