h3-py doesn't work with native python (Arm-64 architecture) on Apple M1

[lixun910]

This is just a log here since Github doesn't support action on Apple M1 yet. Maybe do a manual build for M1 users?

>>> import platform
>>> platform.processor()
'arm'
>>> import h3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/__init__.py", line 3, in <module>
    from .api.basic_str import *
  File "/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/api/__init__.py", line 3, in <module>
    from . import basic_int
  File "/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/api/basic_int.py", line 16, in <module>
    from ._api_template import _api_functions
  File "/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/api/_api_template.py", line 46, in <module>
    from .. import _cy
  File "/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/_cy/__init__.py", line 16, in <module>
    from .cells import (
ImportError: dlopen(/Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/_cy/cells.cpython-38-darwin.so, 2): no suitable image found.  Did find:
        /Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/_cy/cells.cpython-38-darwin.so: mach-o, but wrong architecture
        /Users/xun/PycharmProjects/pythonProject/venv_h3py/lib/python3.8/site-packages/h3/_cy/cells.cpython-38-darwin.so: mach-o, but wrong architecture

[kylebarron]

That looks really weird. Specifically that implies that when you installed h3, you received an x86-64 wheel. IMO that looks more like a pip error than an h3 error. Can you show the log from pip install h3? (Can you also try upgrading pip with pip install -U pip and then trying again?) I would've expected pip to build from source and not match the x86-64 image.

Also ref: #190. It's true that Github Actions doesn't support M1 execution environments, but you can still cross-compile a wheel for M1 using cibuildwheel. In another of my projects it consisted of "just" adding an CIBW_ARCHS_MACOS environment variable, but h3 has a more complicated setup because it needs to compile with h3.

[lixun910]

I am using native arm64 python 3.8, so it should expect the xxx.arm64.whl when do pip install. I can't find one on the pypi site: https://pypi.org/project/h3/#files

Since I am working on an M1 machine, I think I can try to create an arm64 wheel. Will keep you updated :)

[kylebarron]

I think you should be able to follow the development steps to build a wheel yourself. https:/uber/h3-py/blob/master/dev_notes.md

Should be something like make init && python setup.py bdist_wheel off the top of my mind.

[mattigrthr]

I had a similar problem on an M1 with macOS 12.2.1. This was the error message I got:

(mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64')), '/usr/local/lib/cells.cpython-38-darwin.so' (no such file), '/usr/lib/cells.cpython-38-darwin.so' (no such file)

I got it running by installing Python 3.10.2 through pyenv and using pip 22.0.3 with --no-cache-dir when installing the package. Hope this might help somebody stumbling upon this.