libmadx error installing on M1/M2 Apple Silicon

[ab-gh]

When attempting to install cpymad on a MacOS System with arm64 (M1), the following error is generated:

src/cern/cpymad/libmadx.c:776:10: fatal error: 'madX/mad_def.h' file not found
#include "madX/mad_def.h"
         ^~~~~~~~~~~~~~~~

MAD-X its self has installed correctly, so I'm not sure what this error relates to. Are there any plans to release macos-arm64 binaries?

[ab-gh]

Potentially solved with #114

[fsoubelet]

While I am not good enough to handle compiling the necessary parts for Apple silicon, I can only suggest making use of cibuildwheel to produce all wanted wheels conveniently within CI pipelines.

A working example can be found within the scikit-learn workflows, with more listed on the cibuildwheels website itself.

I can only add that I'd be very happy to see Apple Silicon wheels for cpymad :)

[coldfix]

Sounds amazing! This might greatly simplify cpymad's actions configuration. On the other hand, it might not help with building madx itself.

[coldfix]

I was just checking up on the possibility of providing upstream cpymad wheels for M1. Apparently, github actions doesn't host M1 runners yet, although they're planning to support it, at some point. This means it would have to be built using cross-compilation, virtualization, or a self-hosted runner. The easiest option would be to wait for now.

Possibly, cibuildwheel already does this for us using cross-compilation, but I'll have to check in more detail. In particular, there might be difficulties with the need for a fortran compiler (as always), so I expect windows build won't work as easily using this tool.

[fsoubelet]

Regarding macOS it seems that indeed cibuildwheel uses XCode command line tools to perform cross-compilation: https://cibuildwheel.readthedocs.io/en/stable/faq/#apple-silicon

[coldfix]

Hi,

I succeeded in cross-compiling some wheels for M1. These are, however, completely untested because github doesn't provide any hosted runners for this platform. Also, there are tons of warnings during linking.

These experimental wheels will be released shortly (in about an hour or so) with cpymad v1.12.0. I would appreciate any feedback if those things work :)

This might be interesting for any of you @fsoubelet @ab-gh @GuillaumeRD, @pbelange.

Best, Thomas

[fsoubelet]

Hey @coldfix,

I just tested quite a few of my scripts / tests in a new 3.11 environment with your wheels and it all seems fine as far as I can see! :D

Thanks a lot, it's very nice to have these and not need to compile ourselves 👍