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[CI] Build Python wheels for MacOS (x86_64 and arm64) (#7621)

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* Build Python wheels for OSX (x86_64 and arm64)

* Use Conda's libomp when running Python tests

* fix

* Add comment to explain CIBW_TARGET_OSX_ARM64

* Update release script

* Add comments in build_python_wheels.sh

* Document wheel pipeline
This commit is contained in:
Philip Hyunsu Cho
2022-02-02 17:35:48 -08:00
committed by GitHub
parent 271a7c5d43
commit f6e6d0b2c0
8 changed files with 123 additions and 32 deletions
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doc/contrib/ci.rst
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@@ -25,3 +25,15 @@ requests and every update to branches. A few tests however require manual activa
details about noLD. This is a requirement for keeping XGBoost on CRAN (the R package index).
To invoke this test suite for a particular pull request, simply add a review comment
``/gha run r-nold-test``. (Ordinary comment won't work. It needs to be a review comment.)
GitHub Actions is also used to build Python wheels targeting MacOS Intel and Apple Silicon. See
`.github/workflows/python_wheels.yml
<https://github.com/dmlc/xgboost/tree/master/.github/workflows/python_wheels.yml>`_. The
``python_wheels`` pipeline sets up environment variables prefixed ``CIBW_*`` to indicate the target
OS and processor. The pipeline then invokes the script ``build_python_wheels.sh``, which in turns
calls ``cibuildwheel`` to build the wheel. The ``cibuildwheel`` is a library that sets up a
suitable Python environment for each OS and processor target. Since we don't have Apple Silion
machine in GitHub Actions, cross-compilation is needed; ``cibuildwheel`` takes care of the complex
task of cross-compiling a Python wheel. (Note that ``cibuildwheel`` will call
``setup.py bdist_wheel``. Since XGBoost has a native library component, ``setup.py`` contains
a glue code to call CMake and a C++ compiler to build the native library on the fly.)