Un-break building under arm64

[rshura]

The -msse option is specific to x86_64, it does not build under arm64.

[Dobatymo]

It would be better to check if the architecture is ARM64, otherwise the binaries which are built for linux on pypi are too specific to the github actions system. Maybe using platform.machine() == "aarch64".

[rshura]

I don't quite understand the objection. If the build is happening on x86_64 then -march=native will include all -msse flags that are appropriate for the hardware. If the build is happening on any other hardware architecture than x86_64, not just arm64, but anything else, then -msse4.2 will fail. I happened to trigger this on arm64, but it would be the same for anything else.

There's of course a question of what if github builds on arch X and I want to use arch Y, but that is a different issue altogether.

[Dobatymo]

Because the wheels are built with github actions arch=native will optimize for the github runner cpus. They should work on other CPUs also because the pypi wheels are mostly for the convenience of people who cannot build the wheels by themselves. sse4.2 is important for good performance on x86 64 so I included that flag.

So perhaps the ss3 flag should be behind a platform.machine().lower() in ("x86_64", "amd64") (or similar) guard instead.

[rshura]

I did as you suggested.

[Dobatymo]

Hi, could you add import platform on top please?

[Dobatymo]

Thanks!