BLD: enable ABI3 forward-compatible wheels for CPython

.github/workflows/build.yml

@@ -16,13 +16,10 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: actions/setup-python@v3
-
-      - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel==2.11.2
-
       - name: Build wheels
-        run: python -m cibuildwheel --output-dir dist
+        uses: pypa/[email protected]
+        with:
+          output-dir: dist
 
       - uses: actions/upload-artifact@v3
         with:
@@ -39,19 +36,34 @@ jobs:
       - uses: actions/setup-python@v3
 
       - name: Create source distribution
-        run: python ./setup.py sdist
+        run: pipx run build --sdist
 
       - uses: actions/upload-artifact@v3
         with:
           name: python-package-distributions
           path: ./dist/*.tar.gz
 
+  audit_abi3_wheels:
+    name: Audit ABI3 wheels
+    runs-on: ubuntu-latest
+    needs:
+      - build_wheels
+
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: python-package-distributions
+          path: ./dist/
+      - uses: actions/setup-python@v3
+      - run: pipx run abi3audit dist/*abi3*.whl
+
   publish:
     name: Publish to PyPI
     runs-on: ubuntu-latest
     needs:
       - build_wheels
       - build_sdist
+      - audit_abi3_wheels
 
     steps:
       - uses: actions/download-artifact@v3

setup.py

@@ -1,9 +1,40 @@
 __author__ = "Konstantin Weddige"
+import sysconfig
 from setuptools import setup, Extension
+from wheel.bdist_wheel import bdist_wheel
+
+
+MINIMAL_PYTHON_VERSION = (3, 6)
+
+# build with Py_LIMITED_API unless in freethreading build (which does not currently
+# support the limited API in py313t)
+USE_PY_LIMITED_API = not sysconfig.get_config_var("Py_GIL_DISABLED")
+define_macros = []
+if USE_PY_LIMITED_API:
+    define_macros.append(("Py_LIMITED_API", "0x030600f0"))
+
+def _get_python_requires():
+    return f">={'.'.join(str(_) for _ in MINIMAL_PYTHON_VERSION)}"
+
+def _get_cpython_tag():
+    return f"cp{''.join(str(_) for _ in MINIMAL_PYTHON_VERSION[:2])}"
 
 with open("README.rst", "r", encoding="utf-8") as fh:
     long_description = fh.read()
 
+class bdist_wheel_abi3(bdist_wheel):
+    def get_tag(self):
+        python, abi, plat = super().get_tag()
+
+        if python.startswith("cp") and USE_PY_LIMITED_API:
+            # on CPython, our wheels are abi3
+            # and compatible down to MINIMAL_PYTHON_VERSION
+            return _get_cpython_tag(), "abi3", plat
+
+        return python, abi, plat
+
+
+
 setup(
     name="MiniballCpp",
     version="0.2.3",
@@ -21,8 +52,11 @@
             ["src/miniballmodule.cpp"],
             include_dirs=["src"],
             language="c++",
+            define_macros=define_macros,
+            py_limited_api=USE_PY_LIMITED_API,
         ),
     ],
+    python_requires=_get_python_requires(),
     classifiers=[
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Programming Language :: Python",
@@ -31,4 +65,5 @@
         "Topic :: Software Development :: Libraries",
         "Topic :: Utilities",
     ],
+    cmdclass={"bdist_wheel": bdist_wheel_abi3},
 )