Fix issue with absolute path with Python 3.13 on Windows

conftest.py

@@ -92,7 +92,7 @@ def monkeysession(request):
     mpatch.undo()
 
 
-@pytest.fixture(autouse=True, scope="session")
+@pytest.fixture(scope="module")
 def suppress_path_mangle(monkeysession):
     """
     Disable the path mangling in CCompiler. Workaround for #169.

distutils/ccompiler.py

@@ -4,6 +4,7 @@
 for the Distutils compiler abstraction model."""
 
 import os
+import pathlib
 import re
 import sys
 import types
@@ -969,27 +970,33 @@ def out_extensions(self):
         return dict.fromkeys(self.src_extensions, self.obj_extension)
 
     def _make_out_path(self, output_dir, strip_dir, src_name):
-        base, ext = os.path.splitext(src_name)
-        base = self._make_relative(base)
+        return self._make_out_path_exts(
+            output_dir, strip_dir, src_name, self.out_extensions
+        )
+
+    @classmethod
+    def _make_out_path_exts(cls, output_dir, strip_dir, src_name, extensions):
+        r"""
+        >>> exts = {'.c': '.o'}
+        >>> CCompiler._make_out_path_exts('.', False, '/foo/bar.c', exts).replace('\\', '/')
+        './foo/bar.o'
+        >>> CCompiler._make_out_path_exts('.', True, '/foo/bar.c', exts).replace('\\', '/')
+        './bar.o'
+        """
+        src = pathlib.PurePath(src_name)
+        # Ensure base is relative to honor output_dir (python/cpython#37775).
+        base = cls._make_relative(src)
         try:
-            new_ext = self.out_extensions[ext]
+            new_ext = extensions[src.suffix]
         except LookupError:
-            raise UnknownFileError(f"unknown file type '{ext}' (from '{src_name}')")
+            raise UnknownFileError(f"unknown file type '{src.suffix}' (from '{src}')")
         if strip_dir:
-            base = os.path.basename(base)
-        return os.path.join(output_dir, base + new_ext)
+            base = pathlib.PurePath(base.name)
+        return os.path.join(output_dir, base.with_suffix(new_ext))
 
     @staticmethod
-    def _make_relative(base):
-        """
-        In order to ensure that a filename always honors the
-        indicated output_dir, make sure it's relative.
-        Ref python/cpython#37775.
-        """
-        # Chop off the drive
-        no_drive = os.path.splitdrive(base)[1]
-        # If abs, chop off leading /
-        return no_drive[os.path.isabs(no_drive) :]
+    def _make_relative(base: pathlib.Path):
+        return base.relative_to(base.anchor)
 
     def shared_object_filename(self, basename, strip_dir=False, output_dir=''):
         assert output_dir is not None

distutils/tests/test_ccompiler.py

@@ -7,6 +7,8 @@
 
 import pytest
 
+pytestmark = pytest.mark.usefixtures('suppress_path_mangle')
+
 
 def _make_strs(paths):
     """