build abi3

setup.py

@@ -2,6 +2,17 @@
 # -*- coding: utf-8 -*-
 
 from setuptools import setup, find_packages, Extension
+from wheel.bdist_wheel import bdist_wheel
+
+class bdist_wheel_abi3(bdist_wheel):
+    def get_tag(self):
+        python, abi, plat = super().get_tag()
+
+        if python.startswith("cp"):
+            # on CPython, our wheels are abi3 and compatible back to 3.6
+            return "cp36", "abi3", plat
+
+        return python, abi, plat
 
 ext = Extension(
     name                = 'ruapu',
@@ -14,6 +25,7 @@
     packages        = find_packages(where="."),
     package_dir     = {"": "."},
     ext_modules     = [ext],
+    cmdclass        = {"bdist_wheel": bdist_wheel_abi3},
 )
 
 setup(**setup_args)