Provide x64, arm64, and universal2 arch selectors for darwin #547
Description
Description:
Describe your proposal.
As described in this comment by @misl6, it would be nice to add the possibility to choose between arch = universal2, arm64, x64 on darwin (macos).
Justification:
Justification or a use case for your proposal.
Runners for arm64 macos are in the github roadmap, but are not generally available. Once they are, it would be nice to be able to use either "thin" (x86_64 or arm64) or universal2 pythons on that image. Some work toward this was done in PR #114 which was merged then reverted. The design for the arch selector should already be worked out before making the images available:
- what is the exact syntax of the selector
- what will the default be
Note that PyPy is going to release both thin arm64 and x86_64 binary packages in its next release, and CPython already has a universal2 package.
I would propose supporting all three alternatives, as the scientific python stack (NumPy, SciPy, and more) and conda-forge have decided to support thin binary packaging only. It would be convenient if this action would make it easy to support those decisions by not forcing a universal2-only solution.
xref issue #108 which discusses the need for arm/arm64 python.
Are you willing to submit a PR?
Yes, but I don't know if it is relevant for an outside contribution.