Build aarch64 wheels

cibuildwheel allows to build non-native architectures using CIBW_ARCHS.

Author: janaknat

.github/workflows/cibuildwheel.yml

@@ -15,8 +15,18 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-18.04, windows-latest, macos-latest]
+        cibw_archs: ["auto"]
+        include:
+          - os: ubuntu-18.04
+            cibw_archs: "aarch64"
 
     steps:
+      - name: Set up QEMU
+        if: matrix.cibw_archs == 'aarch64'
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: arm64
+
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
@@ -28,7 +38,7 @@ jobs:
 
       - name: Install cibuildwheel
         run: |
-          python -m pip install cibuildwheel==1.6.3
+          python -m pip install cibuildwheel==1.9.0
 
       - name: Copy setup.cfg to configure wheel
         run: |
@@ -43,17 +53,18 @@ jobs:
           CIBW_MANYLINUX_I686_IMAGE: manylinux1
           CIBW_BEFORE_BUILD: pip install certifi numpy==1.19.3
           MPL_DISABLE_FH4: "yes"
+          CIBW_ARCHS: ${{ matrix.cibw_archs }}
 
       - name: Build wheels for CPython
         run: |
           python -m cibuildwheel --output-dir dist
         env:
-          CIBW_BUILD: "cp3?-*"
-          CIBW_SKIP: "cp35-* cp36-* cp39-*"
+          CIBW_BUILD: "cp37-* cp38-*"
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
           CIBW_MANYLINUX_I686_IMAGE: manylinux1
-          CIBW_BEFORE_BUILD: pip install certifi numpy==1.16
+          CIBW_BEFORE_BUILD: pip install certifi oldest-supported-numpy
           MPL_DISABLE_FH4: "yes"
+          CIBW_ARCHS: ${{ matrix.cibw_archs }}
 
       - name: Build wheels for CPython 3.6
         run: |
@@ -62,8 +73,9 @@ jobs:
           CIBW_BUILD: "cp36-*"
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
           CIBW_MANYLINUX_I686_IMAGE: manylinux1
-          CIBW_BEFORE_BUILD: pip install certifi numpy==1.16
+          CIBW_BEFORE_BUILD: pip install certifi oldest-supported-numpy
           MPL_DISABLE_FH4: "yes"
+          CIBW_ARCHS: ${{ matrix.cibw_archs }}
         if: >
           startsWith(github.ref, 'refs/heads/v3.3') ||
           startsWith(github.ref, 'refs/tags/v3.3')
@@ -73,7 +85,8 @@ jobs:
           python -m cibuildwheel --output-dir dist
         env:
           CIBW_BUILD: "pp3?-*"
-          CIBW_BEFORE_BUILD: pip install certifi numpy==1.16
+          CIBW_BEFORE_BUILD: pip install certifi oldest-supported-numpy
+          CIBW_ARCHS: ${{ matrix.cibw_archs }}
         if: >
           runner.os != 'Windows' && (
           startsWith(github.ref, 'refs/heads/v3.3') ||