Hi Georg

Not sure really. I notice you don’t have a “run” section, which seems a bit weird. Maybe it causes the None? I’m guessing you want a “python” entry in there (ok, not for the libraries only). In the STIR feedstock, I needed

- openmp # [osx]

- libgomp # [linux]

(actually in both build/host and run).

Some other irrelevant comments:

We split into build and host by the way, which as far as I understand would allow cross-compilation
No need to really to ask for make on linux. Ninja will work perfectly fine.

For parallelproj, I think subpackages can handle what you need (one without cuda, one with, or even a 3^rd one with the python stuff). For STIR’s dependency on parallelproj, this seems harder, as at the moment we choose either the openmp of cuda version of parallelproj. I guess if we’d change it to always use openmp, and only use the cuda version of it’s present, at least the library could be doen via 2 subpackages. Executables would be harder, as supported projectors are “compiled in”.

Kris

From: SYNERBI-DEVEL CCP SyneRBI Developers list <[log in to unmask]> On Behalf Of Georg Schramm
Sent: 31 October 2022 18:06
To: [log in to unmask]
Subject: conda-forge build cuda

⚠ Caution: External sender

Hi Synergy developers,
motivated by Kris last comments, I tried to update the recipe for parallelprojsuch that it also compiles using conda-forge packages only (and not the cvcc+ cuda-toolkit from nvidia’s channel).
Unfortunately, the build process exists at the very end (after build and running the tests) with:

```
File "/home/georg/mambaforge/lib/python3.10/site-packages/conda_build/build.py", line 3082, in build_tree
for (metadata, need_source_download, need_reparse_in_env) in metadata_tuples:
TypeError: cannot unpack non-iterable NoneType object
```

Has anybody seen this issue before? The returned metadata_tuples seem to be (None,None)

If you want to try reproducing the issue (local cuda installation needed), the recipe is here

(conda-forge-build-branch).

https://github.com/gschramm/parallelproj/blob/conda-forge-build/recipe/meta.yaml

Any help / tips are very welcome.

Bests,

Georg

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