Build abi3 wheels with cibuildwheel

Author: asottile

.github/workflows/wheels.yml

@@ -6,26 +6,30 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-        python_version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9]
+        include:
+        - name: manylinux
+          os: ubuntu-latest
+        - name: macos
+          os: macos-latest
+        - name: win
+          os: windows-latest
 
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-        name: Install Python ${{ matrix.python_version }}
         with:
-          python-version: ${{ matrix.python_version }}
+          submodules: recursive
+      - uses: actions/setup-python@v2
 
       - name: Install cibuildwheel
-        run: |
-          python -m pip install cibuildwheel
+        run: python -m pip install cibuildwheel
       - name: Install Visual C++ for Python 2.7
         if: runner.os == 'Windows'
-        run: |
-          choco install vcpython27 -f -y
+        run: choco install vcpython27 -f -y
       - name: Build wheels
-        run: |
-          python -m cibuildwheel --output-dir wheelhouse
+        run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_BUILD: cp27-${{ matrix.name }}* cp35-${{ matrix.name }}* pp*-${{ matrix.name }}*
       - uses: actions/upload-artifact@v2
         with:
+          name: wheels-${{ matrix.name }}
           path: ./wheelhouse/*.whl

setup.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 import os
+import platform
+import sys
 from setuptools import find_packages, setup
 from setuptools.command.build_ext import build_ext
 
@@ -60,6 +62,19 @@ def run(self):
         }),
     ]
 
+cmdclass = {'build_ext': BuildClibBeforeExt}
+if sys.version_info > (3,) and platform.python_implementation() == "CPython":
+    try:
+        import wheel.bdist_wheel
+    except ImportError:
+        pass
+    else:
+        class BDistWheel(wheel.bdist_wheel.bdist_wheel):
+            def finalize_options(self):
+                self.py_limited_api = "cp3{}".format(sys.version_info[1])
+                wheel.bdist_wheel.bdist_wheel.finalize_options(self)
+        cmdclass['bdist_wheel'] = BDistWheel
+
 setup(
     name="brotlipy",
     version="0.7.0",
@@ -93,9 +108,7 @@ def run(self):
 
     zip_safe=False,
 
-    cmdclass={
-        'build_ext': BuildClibBeforeExt,
-    },
+    cmdclass=cmdclass,
 
     classifiers=[
         "Programming Language :: Python :: Implementation :: CPython",