How come my arm64 Apple silicon wheels are not building?

[adam2392]

I'm trying to use cibuildwheel to build Apple M1 wheels for my package, but for some reason they are not working.

The PR branch I'm working off of is: neurodata/treeple#59

The associated build wheels GH actions yaml file is: https://github.com/neurodata/scikit-tree/blob/eef6c7c42636371940ac9e2a309c3038e9e422e3/.github/workflows/build_wheels.yml

I'm a bit of a novice and couldn't find necessary documentation on this in the setup docs, but maybe I looked incorrectly? Any help would be much appreciated!

[henryiii]

I don't know from that what is failing, but I see you are using Poetry - you might want to look at #1416 and related issues. Poetry doesn't really support cross compiling - you probably need to retag the wheels it produces.

[adam2392]

I actually use meson-Python. The poetry is just there but prolly will get deleted if they end up not supporting diff build backends.

I just added the arm64 option to the matrix of OS but no arm64 Mac OS build is getting triggered. I'm not sure if there's anything special I have to do?

Lmk if you need me to link more info. This CI build wheel tool is super slick but also new to me.

[henryiii]

I'd highly recommend using a more traditional matrix, not arrays. It would then be much clearer what you did wrong. You added an extra item to the array but you never use it.

      matrix:
        os: # see scipy wheels.yml GH actions
          - [ubuntu-22.04, manylinux, x86_64]
          - [macos-11, macosx, x86_64, arm64]
          - [windows-2019, win, AMD64]

        python: [["cp39", "3.9"], ["cp310", "3.10"], ["cp311", "3.11.0-alpha - 3.11.0"]]
        # python[0] is used to specify the python versions made by cibuildwheel

But you are using matrix.os[0], matrix.os[1], and matrix.os[2], but never matrix.os[3] (it normally doesn't exist!). Python is also more complex than it needs to be, and you do not need to get a matching host Python for cibuildwheel to work.

Instead, I'd get rid of the arrays and try to use simple values. Then you can include: any extra arrangements you need.

[henryiii]

Tried to show what I was thinking in neurodata/treeple#60.

[adam2392]

Thanks @henryiii for the suggestions! I tried doing a fresh job for just apple M1 to see what wasn't working (meson vs some cibuildwheel config) and got this error:

However, I am using exactly the code snippet suggested in https://cibuildwheel.readthedocs.io/en/stable/faq/#apple-silicon. Do you happen to know if this Is a meson issue, or a cibuildhweel issue?

× Preparing metadata (pyproject.toml) did not run successfully.
[140](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:147)
    │ exit code: 1
[141](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:148)
    ╰─> [15 lines of output]
[142](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:149)
        The Meson build system
[143](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:150)
        Version: 1.0.1
[144](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:151)
        Source dir: /Users/runner/work/scikit-tree/scikit-tree
[145](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:152)
        Build dir: /Users/runner/work/scikit-tree/scikit-tree/.mesonpy-s10814de/build
[146](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:153)
        Build type: cross build
[147](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:154)
        Project name: scikit-tree
[148](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:155)
        Project version: 0.0.0.dev0
[149](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:156)
        C compiler for the host machine: cc -arch arm64 (clang 13.0.0 "Apple clang version 13.0.0 (clang-1300.0.29.30)")
[150](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:157)
        C linker for the host machine: cc -arch arm64 ld64 711
[151](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:158)
        
[152](https://github.com/neurodata/scikit-tree/actions/runs/4625707444/jobs/8181714261?pr=59#step:3:159)
        ../../meson.build:1:0: ERROR: Unknown compiler(s): [['cpp', '-arch', 'arm64']]