Building and uploading numpy wheels

The wheel builds are currently done using Azure Pipelines and TravisCI, Appveyor is not used and is disabled at this time.

Build process pages

• Azure Pipelines at https://dev.azure.com/numpy/numpy/_build?definitionId=8&_a=summary&view=runs
• Travis CI at https://app.travis-ci.com/github/MacPython/numpy-wheels/builds
• The Appveyor at https://ci.appveyor.com/project/matthew-brett/numpy-wheels
• The driving github repository is https://github.com/MacPython/numpy-wheels

Uploaded file locations

• Release builds at https://anaconda.org/multibuild-wheels-staging/numpy/files
• Nightly builds at https://anaconda.org/scipy-wheels-nightly/numpy/files

How it works

The wheel-building repository:

• checks out either a known version of NumPy or master's HEAD
• downloads OpenBLAS using numpy/tools/openblas_support.py
• builds a numpy wheel, linking against the downloaded library and using the appropriate additional variables from env_vars.sh or env_vars32.sh
• processes the wheel using delocate (OSX) or auditwheel repair (manylinux). delocate and auditwheel copy the required dynamic libraries into the wheel and relinks the extension modules against the copied libraries;
• uploads the wheel to the appropriate release or nightly Anaconda repository.

The resulting wheels are self-contained and do not need any external dynamic libraries apart from those provided as standard by OSX / Linux as defined by the manylinux standard.

Triggering a build

You will likely want to edit the azure-pipelines.yml and .travis.yml files to specify the BUILD_COMMIT before triggering a build - see below.

You will need write permission to the github repository to trigger new builds. Contact us on the mailing list if you need this.

You can trigger a build by either of two methods:

• making a commit to the numpy-wheels repository (e.g. with git commit --allow-empty) followed by a push of the desired branch.
• merging a pull request to the master branch

Which numpy commit does the repository build?

PRs merged to this repo from a fork, and commits directly pushed to this repo will build the commit specified in the BUILD_COMMIT at the top of the azure-pipelines.yml file, the wheels will be uploaded to https://anaconda.org/multibuild-wheels-staging/numpy. The NIGHTLY_BUILD_COMMIT is built once a week (sorry for the misnomer), and uploaded to https://anaconda.org/scipy-wheels-nightly/. The value of BUILD_COMMIT can be any naming of a commit, including branch name, tag name or commit hash.

Uploading the built wheels to pypi

When the wheels are updated, you can download them using the download-wheels.py script and then upload them using twine. Things are done this way so that we can generate hashes and the README files needed for a release before putting the wheels up on PyPI. The download-wheels.py script is run as follows:

$ python3 tools/download-wheels.py 1.19.0 -w <path_to_wheelhouse>

Where 1.19.0 is the release version, The wheelhouse argument is optional and defaults to ./release/installers.

You will need beautifulsoup4 and urllib3 installed in order to run download-wheels.py and permissions in order to upload to PyPI.