Support for pre-built aarch64/arm64 wheels

[daniel-j-h]

Hallo! 👋 and greetings through the cyber 💻 ✨

With mac folks transitioning to aarch64 as a viable platform, it would be great to provide pre-built aarch64 wheels for osmium, too.

I'm opening this ticket so we can capture thoughts, blockers, and a plan moving forward.

I think long term having arm64 wheels would be great, but also know that right now it's very early for arm64.

osmium is such a fundamental and important package, it would be great to have it Just Work ™️ on arm64 in the future, too! 🎉

Thoughts? 🤗

[lonvia]

We'd need four ingredients for that:

• support for aarch64 for the multibuild package. On a quick look that seems to work.
• CI support for aarch64. Travis is not really an option anymore.
• a PR for the new architecture
• somebody with a aarch64-based Mac to test the result

[daniel-j-h]

cc @ijosc who has an aarch64 Mac and would probably be open to install a pre-built wheel and run a test script or so :)

[wiktorn]

I guess that different approach is to use macOS cross-compilation builds / universal2 packages, i.e. use macOS x64 to build macOS aarch64 package.

cibuild has merge some support for that recently:
pypa/cibuildwheel#484