First attempt at abi3.

pyproject.toml

@@ -70,14 +70,28 @@ ignore_missing_imports = true
 disallow_any_unimported = false
 
 [tool.cibuildwheel]
-build = "{cp3{10..13}-*,pp310-*}"
+build = "{cp310-*,pp310-*}"
 build-frontend = "build"
 free-threaded-support = true
 before-test = "pip install -r {project}/requirements/tests.txt"
 test-command = "pytest --pyargs uarray"
 
+[tool.cibuildwheel.linux]
+repair-wheel-command = [
+  "auditwheel repair -w {dest_dir} {wheel}",
+  "pipx run abi3audit --strict --report {wheel}",
+]
 [tool.cibuildwheel.macos]
 archs = ["universal2"]
+repair-wheel-command = [
+  "delocate-wheel --require-archs {delocate_archs} -w {dest_dir} -v {wheel}",
+  "pipx run abi3audit --strict --report {wheel}",
+]
+[tool.cibuildwheel.windows]
+repair-wheel-command = [
+  "copy {wheel} {dest_dir}",
+  "pipx run abi3audit --strict --report {wheel}",
+]
 
 [[tool.cibuildwheel.overrides]]
 select = "*-macosx_*"

setup.py

@@ -1,3 +1,19 @@
-from setuptools import setup
+from setuptools import setup, Extension
+from wheel.bdist_wheel import bdist_wheel
 
-setup(cmake_source_dir="./src")
+
+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 3.10
+            return "cp310", "abi3", plat
+
+        return python, abi, plat
+
+
+setup(
+    cmake_source_dir="./src",
+    cmdclass={"bdist_wheel": bdist_wheel_abi3},
+)

src/CMakeLists.txt

@@ -2,13 +2,23 @@ cmake_minimum_required(VERSION 3.15...3.30)
 
 project(${SKBUILD_PROJECT_NAME} LANGUAGES CXX)
 
-find_package(Python COMPONENTS Interpreter Development.Module REQUIRED)
-
-Python_add_library(_uarray MODULE
-    small_dynamic_array.h
-    vectorcall.h
-    vectorcall.cxx
-    _uarray_dispatch.cxx
-WITH_SOABI)
+find_package(Python REQUIRED COMPONENTS Interpreter Development.Module ${SKBUILD_SABI_COMPONENT})
+
+if(NOT "${SKBUILD_SABI_VERSION}" STREQUAL "" AND Python_INTERPRETER_ID STREQUAL Python)
+    python_add_library(_uarray MODULE WITH_SOABI USE_SABI ${SKBUILD_SABI_VERSION}
+        small_dynamic_array.h
+        vectorcall.h
+        vectorcall.cxx
+        _uarray_dispatch.cxx
+    )
+else()
+    python_add_library(_uarray MODULE WITH_SOABI
+        small_dynamic_array.h
+        vectorcall.h
+        vectorcall.cxx
+        _uarray_dispatch.cxx
+    )
+endif()
+
 set_property(TARGET _uarray PROPERTY CXX_STANDARD 17)
 install(TARGETS _uarray LIBRARY DESTINATION uarray)