Add wheel building and deployment via GitHub Actions and cibuildwheel

.github/workflows/wheel_tests_and_release.yml

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+name: Build Wheels and Release
+on:
+  push:
+    branches:
+      - cibuildwheel
+    tags:
+      - 'v*'
+      - 'buildwheels*'
+env:
+  CIBW_BUILD_VERBOSITY: 2
+  # CIBW_BEFORE_BUILD: pip install cython
+  CIBW_TEST_REQUIRES: pytest
+  CIBW_TEST_COMMAND: pytest --pyargs pywt
+
+
+jobs:
+  build_linux_37_and_above_wheels:
+    name: Build python ${{ matrix.cibw_python }} wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-18.04]
+        cibw_python: [ "cp37-*", "cp38-*" ]
+        cibw_manylinux: [ manylinux1 ]
+        include:
+          - os: ubuntu-18.04
+            cibw_python: "cp39-*"
+            cibw_manylinux: manylinux2010
+          - os: ubuntu-18.04
+            cibw_python: "cp310-*"
+            cibw_manylinux: manylinux2014
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: '3.7'
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: arm64
+      - name: Install cibuildwheel
+        run: |
+          python -m pip install cibuildwheel
+      - name: Build the wheel
+        run: |
+          python -m cibuildwheel --output-dir dist
+        env:
+          CIBW_BUILD: ${{ matrix.cibw_python }}
+          CIBW_ARCHS_LINUX: auto aarch64
+          CIBW_MANYLINUX_X86_64_IMAGE: ${{ matrix.cibw_manylinux }}
+          CIBW_MANYLINUX_I686_IMAGE: ${{ matrix.cibw_manylinux }}
+      - uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: ./dist/*.whl
+
+  build_macos_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest]
+    env:
+      MACOSX_DEPLOYMENT_TARGET: "10.13"
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: '3.7'
+
+      - name: Install cibuildwheel
+        run: |
+          python -m pip install cibuildwheel
+      - name: Build wheels for CPython (MacOS)
+        run: |
+          python -m cibuildwheel --output-dir dist
+        env:
+          CIBW_BUILD: "cp3?-*"  #  cp310-*
+          CIBW_SKIP: "cp35-* cp36-*"
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
+          CIBW_MANYLINUX_I686_IMAGE: manylinux1
+          CC: /usr/bin/clang
+          CXX: /usr/bin/clang++
+          # CPPFLAGS: "-Xpreprocessor -fopenmp"
+          # CFLAGS: "-Wno-implicit-function-declaration -I/usr/local/opt/libomp/include"
+          # CXXFLAGS: "-I/usr/local/opt/libomp/include"
+          # LDFLAGS: "-Wl,-rpath,/usr/local/opt/libomp/lib -L/usr/local/opt/libomp/lib -lomp"
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: ./dist/*.whl
+
+  build_windows_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest]
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: '3.7'
+
+      - name: Install cibuildwheel
+        run: |
+          python -m pip install cibuildwheel
+      - name: Build Windows wheels for CPython
+        run: |
+          python -m cibuildwheel --output-dir dist
+        env:
+          CIBW_BUILD: "cp3?-*"  #  cp310-*
+          CIBW_SKIP: "cp35-* cp36-*"
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
+          CIBW_MANYLINUX_I686_IMAGE: manylinux1
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: ./dist/*.whl
+
+
+  deploy:
+    name: Release
+    needs: [build_linux_37_and_above_wheels, build_macos_wheels, build_windows_wheels]
+    if: github.repository_owner == 'PyWavelets' && startsWith(github.ref, 'refs/tags/v') && always()
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: '3.7'
+
+      - name: Install Twine
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements/build.txt
+          pip install twine
+
+      - uses: actions/download-artifact@v2
+        id: download
+        with:
+          name: wheels
+          path: ./dist
+
+      - name: Publish the source distribution on PyPI
+        run: |
+          PYWT_VERSION=$(git describe --tags)
+          python setup.py sdist
+          ls -la ${{ github.workspace }}/dist
+          # We prefer to release wheels before source because otherwise there is a
+          # small window during which users who pip install pywt will require compilation.
+          twine upload ${{ github.workspace }}/dist/*.whl
+          twine upload ${{ github.workspace }}/dist/pywt-${PYWT_VERSION:1}.tar.gz
+        env:
+          TWINE_USERNAME: ${{ secrets.TWINE_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
+
+      - name: Github release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}

pyproject.toml

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+# Note that in maintenance branches, all build dependencies should
+# have an upper bound equal to the most recent already-released version
+# of the dependency. This to prevent that a future backwards-incompatible
+# release will break the source build of a PyWavelets release.
+
+
+[build-system]
+requires = [
+    "wheel",
+    "setuptools",
+    "Cython>=0.29.18",
+
+    # NumPy dependencies - to update these, sync from
+    # https://github.com/scipy/oldest-supported-numpy/, and then
+    # update minimum version to match our install_requires min version
+    # ----------------------------------------------------------------
+
+    # numpy 1.19 was the first minor release to provide aarch64 wheels, but
+    # wheels require fixes contained in numpy 1.19.2
+    "numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'",
+    # aarch64 for py39 is covered by default requirement below
+
+    # arm64 on Darwin supports Python 3.8 and above requires numpy>=1.20.0
+    "numpy==1.20.0; python_version=='3.8' and platform_machine=='arm64' and platform_system=='Darwin'",
+    "numpy==1.20.0; python_version=='3.9' and platform_machine=='arm64' and platform_system=='Darwin'",
+
+    # default numpy requirements
+    "numpy==1.17.3; python_version=='3.8' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64' and platform_python_implementation != 'PyPy'",
+    "numpy==1.19.3; python_version=='3.9' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_python_implementation != 'PyPy'",
+
+    # For Python versions which aren't yet officially supported,
+    # we specify an unpinned NumPy which allows source distributions
+    # to be used and allows wheels to be used as soon as they
+    # become available.
+    "numpy; python_version>='3.10'",
+    "numpy; python_version>='3.8' and platform_python_implementation=='PyPy'",
+]