Switch macos x86_64 to macos14 in generate-ci

[masklinn]

The macos12 images are deprecated and will be decommissioned by december, jobs have started triggering warnings and brownouts are planned.

In my understanding this means the x86_64 wheels will be cross-compiled from the arm64 runners, but I understand cross compilation works fine. The x86_64 cross compilation is slower than the ARM64 compilation, but on my test project it's faster than the macos13 x86_64 build so that doesn't seem like a massive concern I feel?

[messense]

Thanks, note that pytest step also needs adjustment because you can't run tests for x86_64 wheels on aarch64 macOS after this change.

[masklinn]

Thanks, note that pytest step also needs adjustment because you can't run tests for x86_64 wheels on aarch64 macOS after this change.

Ah good catch, I assumed either arm64 or x86_64 python would be installed and then that's what would be run, but not so, and it's not even a question of enabling architecture for macos as from its docs setup-python installs a universal binary.

From my testing it looks like arch will correctly select the architecture, so I could set env: ARCHPREFERENCE on the run step then prefix every relevant command (pip install to ensure the correct binary arch is selected, and running the test suite) with arch and it should work correctly, what do you think?

[messense]

That may not work with pypy I think, they don't have universal2 binaries: https://pypy.org/download.html

From https://github.com/actions/python-versions/releases/tag/3.13.0-11228081754 I didn't find any universal2 python distributions.

[masklinn]

That may not work with pypy I think, they don't have universal2 binaries: https://pypy.org/download.html

So should probably pass the architecture to setup-python still (same as Windows) in order to retrieve the correct pypy (and graal as they don't seem to provide universal binaries either), then arch should not hurt, worst case scenario it'll trigger an error if we're running the wrong architecture which seems a benefit more than a drawback e.g.

$ arch -x86_64 graalpy-24.1.0-macos-aarch64/bin/graalpy
arch: posix_spawnp: graalpy-24.1.0-macos-aarch64/bin/graalpy: Bad CPU type in executable

From https://github.com/actions/python-versions/releases/tag/3.13.0-11228081754 I didn't find any universal2 python distributions.

The note about universal binaries is in the readme: https://github.com/actions/python-versions/tree/3.13.0-11228081754?tab=readme-ov-file#building-installation-packages

The x86_64 and amd64 assets bundle the exact same thing:

$ sha1sum python-3.13.0-darwin-x64/python-3.13.0-macos11.pkg
1c1e6e6cf6370ff8020fb7b93a8b408f23d65054  python-3.13.0-darwin-x64/python-3.13.0-macos11.pkg
$ shasum python-3.13.0-darwin-arm64/python-3.13.0-macos11.pkg
1c1e6e6cf6370ff8020fb7b93a8b408f23d65054  python-3.13.0-darwin-arm64/python-3.13.0-macos11.pkg