Port wrapt to heap types and stable ABI

.github/workflows/main.yml

@@ -8,18 +8,16 @@ jobs:
     name: Test (${{ matrix.os }}, ${{ matrix.python-version }})
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os:
           - ubuntu-latest
         python-version:
-          - 2.7
-          - 3.5
           - 3.6
           - 3.7
           - 3.8
           - 3.9
           - 3.10-dev
-          - pypy-2.7
           - pypy-3.6
           - pypy-3.7
     steps:
@@ -45,18 +43,16 @@ jobs:
     name: Test (${{ matrix.os }}, ${{ matrix.python-version }})
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os:
           - macos-latest
         python-version:
-          - 2.7
-          - 3.5
           - 3.6
           - 3.7
           - 3.8
           - 3.9
           - 3.10-dev
-          - pypy-2.7
           - pypy-3.6
           - pypy-3.7
     steps:
@@ -82,17 +78,16 @@ jobs:
     name: Test (${{ matrix.os }}, ${{ matrix.python-version }})
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os:
           - windows-latest
         python-version:
-          - 3.5
           - 3.6
           - 3.7
           - 3.8
           - 3.9
           - 3.10-dev
-          - pypy-2.7
           - pypy-3.6
           - pypy-3.7
     steps:
@@ -152,6 +147,8 @@ jobs:
         env:
             WRAPT_INSTALL_EXTENSIONS: true  # Require extensions.
             CIBW_SKIP: pp*                  # Skip wheels for PyPy.
+            # build on 3.6 to 3.9. cp39 provides stable abi cp39-abi3
+            CIBW_BUILD: cp36-* cp37-* cp38-* cp39-*
       - uses: actions/upload-artifact@v2
         with:
           name: dist

setup.cfg

@@ -16,10 +16,7 @@ keywords = wrapper, proxy, decorator
 classifiers =
     Development Status :: 5 - Production/Stable
     License :: OSI Approved :: BSD License
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
@@ -34,7 +31,7 @@ project_urls =
 
 [options]
 zip_safe = false
-python_requires = >= 2.7, != 3.0.*, != 3.1.*, != 3.2.*
+python_requires = >= 3.6
 packages = find:
 package_dir =
     =src
@@ -71,19 +68,16 @@ norecursedirs = .tox venv
 
 [tox:tox]
 envlist =
-  py{27,35,36,37,38,39,310}-{without,install,disable}-extensions,
+  py{36,37,38,39,310}-{without,install,disable}-extensions,
   pypy-without-extensions
 
 [gh-actions]
 python =
-    2.7: py27, py27-without-extensions, py27-install-extensions, py27-disable-extensions
-    3.5: py35, py35-without-extensions, py35-install-extensions, py35-disable-extensions
     3.6: py36, py36-without-extensions, py36-install-extensions, py36-disable-extensions
     3.7: py37, py37-without-extensions, py37-install-extensions, py37-disable-extensions
     3.8: py38, py38-without-extensions, py38-install-extensions, py38-disable-extensions
     3.9: py39, py39-without-extensions, py39-install-extensions, py39-disable-extensions
     3.10: py310, py310-without-extensions, py310-install-extensions, py310-disable-extensions
-    pypy-2.7: pypy-without-extensions
     pypy-3.6: pypy-without-extensions
     pypy-3.7: pypy-without-extensions
 

setup.py

@@ -1,7 +1,14 @@
 import os
 import platform
+
+import sys
 import setuptools
 
+try:
+    from wheel.bdist_wheel import bdist_wheel
+except ImportError:
+    bdist_wheel = None
+
 
 # # --- Detect if extensions should be disabled ------------------------------
 
@@ -17,19 +24,43 @@
 if platform.python_implementation() != "CPython":
     disable_extensions = True
 
+# # --- stable ABI / limited API hacks ---------------------------------------
+# Python < 3.9 is missing some features to build wheels with stable ABI
+
+define_macros = []
+cmdclass = {}
+
+if sys.version_info >= (3, 9, 0) and platform.python_implementation() == "CPython":
+    py_limited_api = True
+    define_macros.append(("Py_LIMITED_API", "0x03090000"))
+
+    if bdist_wheel is not None:
+        class LimitedAPIWheel(bdist_wheel):
+            def finalize_options(self):
+                self.py_limited_api = "cp39"
+                bdist_wheel.finalize_options(self)
+
+        cmdclass["bdist_wheel"] = LimitedAPIWheel
+else:
+    py_limited_api = False
+
+
 # --- C extension ------------------------------------------------------------
 
 extensions = [
     setuptools.Extension(
         "wrapt._wrappers",
         sources=["src/wrapt/_wrappers.c"],
         optional=not force_extensions,
+        py_limited_api=py_limited_api,
+        define_macros=define_macros,
     )
 ]
 
 
 # --- Setup ------------------------------------------------------------------
 
 setuptools.setup(
-    ext_modules=[] if disable_extensions else extensions
+    ext_modules=[] if disable_extensions else extensions,
+    cmdclass=cmdclass
 )