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matplotlib: add build, test workflows for riscv64
We make use of uv to simplify the pipeline in several ways: - replace 'python -m pip' with 'uv pip' - set cache to match uv usage - use uv for CIBW_BUILD_FRONTEND - set UV_EXTRA_INDEX_URL to our GitLab registry, with UV_INDEX_STRATEGY=unsafe-best-match and UV_ONLY_BINARY=:all: so we pick whichever source has a binary wheel - drop 'allow-prereleases' from setup-uv since this only applies to the setup-python action Also make sure we explicitly skip musllinux builds, since upstream isn't building them either. Otherwise, we run into issues with uv setup: |Building cp314-musllinux_riscv64 wheel |CPython 3.14 musllinux riscv64 | |Setting up build environment... | | + mkdir -p / | + /opt/python/cp39-cp39/bin/python -c 'import sys, json, os; json.dump(os.environ.copy(), sys.stdout)' | + which python | + which uv | ✕ 4.07s |Error: cibuildwheel: Command ['which', 'uv'] failed with code 1. | |Error: Process completed with exit code 1. Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
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‎.github/workflows/build-matplotlib.yml‎

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---
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name: Build matplotlib wheels (riscv64)
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on:
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workflow_dispatch:
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inputs:
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version:
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description: 'matplotlib version to build (git tag without leading v, e.g. 3.11.0)'
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required: true
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default: '3.11.0'
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pull_request:
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paths:
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- '.github/workflows/build-matplotlib.yml'
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- '.github/workflows/test-matplotlib.yml'
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concurrency:
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group: ${{ github.workflow }}-${{ inputs.version || '3.11.0' }}-${{ github.head_ref || github.run_id }}
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cancel-in-progress: true
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permissions:
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contents: read # to fetch code (actions/checkout)
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env:
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# `inputs.version` is empty on pull_request events; default there.
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MPL_VERSION: ${{ inputs.version || '3.11.0' }}
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# Query PyPI + gitlab riscv64 mirror; pick best compatible wheel
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# (`unsafe-best-match` = pip-like). Refuse sdist for dependencies so uv
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# selects the gitlab riscv64 wheel when PyPI lacks one instead of falling
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# back to a source build.
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UV_EXTRA_INDEX_URL: https://gitlab.com/api/v4/projects/riseproject%2Fpython%2Fwheel_builder/packages/pypi/simple
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UV_INDEX_STRATEGY: unsafe-best-match
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UV_ONLY_BINARY: ':all:'
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jobs:
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build_sdist:
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name: Build matplotlib ${{ inputs.version || '3.11.0' }} sdist
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runs-on: ubuntu-24.04-riscv
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permissions:
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contents: read
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outputs:
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SDIST_NAME: ${{ steps.sdist.outputs.SDIST_NAME }}
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steps:
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- name: Checkout python-wheels
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uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
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with:
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path: python-wheels-repo
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persist-credentials: false
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- name: Checkout matplotlib v${{ env.MPL_VERSION }}
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uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
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with:
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repository: matplotlib/matplotlib
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ref: v${{ env.MPL_VERSION }}
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fetch-depth: 0
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persist-credentials: false
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- uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
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name: Install Python
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with:
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python-version: '3.12'
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activate-environment: true
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enable-cache: false
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# Something changed somewhere that prevents the downloaded-at-build-time
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# licenses from being included in built wheels, so pre-download them so
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# that they exist before the build and are included.
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- name: Pre-download bundled licenses
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run: >
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curl -Lo LICENSE/LICENSE_QHULL
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https://github.com/qhull/qhull/raw/2020.2/COPYING.txt
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- name: Install dependencies
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run: uv pip install build twine
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- name: Build sdist
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id: sdist
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run: |
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python -m build --sdist
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python ci/export_sdist_name.py
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- name: Check README rendering for PyPI
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run: twine check dist/*
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- name: Upload sdist result
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uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
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with:
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name: matplotlib-${{ env.MPL_VERSION }}-cibw-sdist
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path: dist/*.tar.gz
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if-no-files-found: error
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build_wheels:
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needs: build_sdist
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name: Build matplotlib ${{ inputs.version || '3.11.0' }} wheels for riscv64
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permissions:
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contents: read
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runs-on: ubuntu-24.04-riscv
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steps:
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- name: Checkout python-wheels
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uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
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with:
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path: python-wheels-repo
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persist-credentials: false
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- name: Download sdist
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uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
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with:
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name: matplotlib-${{ env.MPL_VERSION }}-cibw-sdist
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path: dist/
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- name: Build wheels for CPython 3.14
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uses: pypa/cibuildwheel@8d2b08b68458a16aeb24b64e68a09ab1c8e82084 # v3.4.1
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with:
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package-dir: dist/${{ needs.build_sdist.outputs.SDIST_NAME }}
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env:
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CIBW_BUILD: "cp314-* cp314t-*"
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CIBW_ARCHS: "riscv64"
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# Skip musllinux: upstream matplotlib isn't building it either
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CIBW_SKIP: "*-musllinux_*"
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CIBW_BUILD_FRONTEND: "build[uv]"
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CIBW_ENVIRONMENT: >-
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UV_EXTRA_INDEX_URL=https://gitlab.com/api/v4/projects/riseproject%2Fpython%2Fwheel_builder/packages/pypi/simple
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UV_INDEX_STRATEGY=unsafe-best-match
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UV_ONLY_BINARY=:all:
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- name: Build wheels for CPython 3.13
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uses: pypa/cibuildwheel@8d2b08b68458a16aeb24b64e68a09ab1c8e82084 # v3.4.1
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with:
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package-dir: dist/${{ needs.build_sdist.outputs.SDIST_NAME }}
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env:
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CIBW_BUILD: "cp313-*"
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CIBW_ARCHS: "riscv64"
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# Skip musllinux: upstream matplotlib isn't building it either
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CIBW_SKIP: "*-musllinux_*"
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CIBW_BUILD_FRONTEND: "build[uv]"
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CIBW_ENVIRONMENT: >-
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UV_EXTRA_INDEX_URL=https://gitlab.com/api/v4/projects/riseproject%2Fpython%2Fwheel_builder/packages/pypi/simple
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UV_INDEX_STRATEGY=unsafe-best-match
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UV_ONLY_BINARY=:all:
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- name: Build wheels for CPython 3.12
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uses: pypa/cibuildwheel@8d2b08b68458a16aeb24b64e68a09ab1c8e82084 # v3.4.1
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with:
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package-dir: dist/${{ needs.build_sdist.outputs.SDIST_NAME }}
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env:
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CIBW_BUILD: "cp312-*"
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CIBW_ARCHS: "riscv64"
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# Skip musllinux: upstream matplotlib isn't building it either
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CIBW_SKIP: "*-musllinux_*"
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CIBW_BUILD_FRONTEND: "build[uv]"
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CIBW_ENVIRONMENT: >-
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UV_EXTRA_INDEX_URL=https://gitlab.com/api/v4/projects/riseproject%2Fpython%2Fwheel_builder/packages/pypi/simple
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UV_INDEX_STRATEGY=unsafe-best-match
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UV_ONLY_BINARY=:all:
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- uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
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with:
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name: matplotlib-${{ env.MPL_VERSION }}-cibw-wheels-riscv64
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path: ./wheelhouse/*.whl
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if-no-files-found: error
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publish:
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name: Publish matplotlib ${{ inputs.version || '3.11.0' }} to GitLab
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needs: build_wheels
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# Only publish when the workflow was triggered from main with a specific
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# version. Manual trigger is the only entry point that reaches main;
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# PR runs sit on refs/pull/<n>/merge and skip this job.
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if: github.ref == 'refs/heads/main'
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runs-on: ubuntu-24.04-riscv
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permissions:
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contents: read
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steps:
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- name: Checkout python-wheels
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uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
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with:
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path: python-wheels-repo
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persist-credentials: false
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- name: Download wheels
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uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
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with:
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name: matplotlib-${{ env.MPL_VERSION }}-cibw-wheels-riscv64
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path: dist
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- name: Publish to GitLab PyPI registry
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uses: ./python-wheels-repo/actions/publish-to-gitlab
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with:
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gitlab-username: ${{ vars.GITLAB_DEPLOY_USER }}
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gitlab-token: ${{ secrets.GITLAB_DEPLOY_TOKEN }}
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gitlab-project-id: ${{ vars.GITLAB_PROJECT_ID }}
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files: |
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dist/*.whl

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