Add Windows

[jaimergp]

Checklist

• [X] Used a personal fork of the feedstock to propose changes
• [X] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [X] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [X] Ensured the license file is being packaged.

Bringing CUDA to Windows

We need three things

• cudatoolkit packages (submitted by @scopatz)
• nvcc metapackage (this PR)
• [X] Install drivers via conda-forge-ci-setup -- see https://github.com/conda-forge/conda-forge-ci-setup-feedstock/pull/129
• [X] Add migrator to conda-forge-pinning -- see https://github.com/conda-forge/conda-forge-pinning-feedstock/pull/914
  • Added migrator manually for now

Questions:

• [X] There's no lib stubs on Windows, so I am symlinking / copying cuda.lib from CUDA_HOME\lib\x64 to LIBRARY_LIB. Is this ok?
• [X] The env var is CUDA_PATH, not CUDA_HOME, but I am aliasing this one just in case.
• [X] There's no cuda-gdb so I am using nvcc as a fallback pathfinder
• [X] CUDA 9.2 requires vs2015, which is now deprecated in conda-forge. There could be a workaround, but looks tricky.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[jaimergp]

This passes locally but the CLI installation of CUDA doesn't modify PATH or sets CUDA_PATH. I'll look into it tomorrow!

[jaimergp]

Looks like it's working. I have updated the PR description with comments and questions.

[jaimergp]

I think I was a bit too quick to push the new commits. The new conda-forge-ci-setup is not deployed yet 😬

[jaimergp]

I guess CUDA 11 places their Windows files elsewhere. I'll investigate locally.

[jaimergp]

That did it. CUDA 11 does not ship a %CUDA_HOME%\version.txt file, so I am querying %CUDA_HOME%\bin\nvcc.exe --version for release %PKG_VERSION% as a fallback mechanism.

[jaimergp]

Anything else needed?

[jaimergp]

Thanks! 🥳

[jakirkham]

Thanks for all of this work! 😄