Allow bdist_wheel working without ctypes

src/wheel/bdist_wheel.py

@@ -24,7 +24,6 @@
 from setuptools import Command
 
 from . import __version__ as wheel_version
-from .macosx_libfile import calculate_macosx_platform_tag
 from .metadata import pkginfo_to_metadata
 from .util import log
 from .vendored.packaging import tags
@@ -68,6 +67,8 @@ def get_platform(archive_root):
     """Return our platform name 'win32', 'linux_x86_64'"""
     result = sysconfig.get_platform()
     if result.startswith("macosx") and archive_root is not None:
+        from .macosx_libfile import calculate_macosx_platform_tag
+
         result = calculate_macosx_platform_tag(archive_root, result)
     elif _is_32bit_interpreter():
         if result == "linux-x86_64":

tests/test_bdist_wheel.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import builtins
+import functools
 import os.path
 import platform
 import shutil
@@ -421,3 +423,39 @@ def test_platform_linux32(reported, expected, monkeypatch):
     cmd.root_is_pure = False
     _, _, actual = cmd.get_tag()
     assert actual == expected
+
+
+builtin_import = builtins.__import__
+
+
+def _fake_import(name: str, *args, **kwargs):
+    if name == "ctypes":
+        raise ModuleNotFoundError("No module named %s" % name)
+    return builtin_import(name, *args, **kwargs)
+
+
+def mock_import(func):
+    @functools.wraps(func)
+    def wrap() -> None:
+        wheel_module_items = [
+            item for item in sys.modules.items() if item[0].startswith("wheel")
+        ]
+        try:
+            builtins.__import__ = _fake_import
+            for name, _ in wheel_module_items:
+                del sys.modules[name]
+            return func()
+        finally:
+            # restore original modules
+            builtins.__import__ = builtin_import
+            for name, module in wheel_module_items:
+                sys.modules[name] = module
+
+    return wrap
+
+
+@mock_import
+def test_no_ctypes() -> None:
+    from wheel import bdist_wheel
+
+    assert bdist_wheel