Remove deprecated fallback for 'distutils.commands.build.build.sub_co…

…mmands +='

setuptools/command/build.py

@@ -1,31 +1,13 @@
 from typing import Dict, List, Protocol
 from distutils.command.build import build as _build
 
-from ..warnings import SetuptoolsDeprecationWarning
-
 _ORIGINAL_SUBCOMMANDS = {"build_py", "build_clib", "build_ext", "build_scripts"}
 
 
 class build(_build):
     # copy to avoid sharing the object with parent class
     sub_commands = _build.sub_commands[:]
 
-    def get_sub_commands(self):
-        subcommands = {cmd[0] for cmd in _build.sub_commands}
-        if subcommands - _ORIGINAL_SUBCOMMANDS:
-            SetuptoolsDeprecationWarning.emit(
-                "Direct usage of `distutils` commands",
-                """
-                It seems that you are using `distutils.command.build` to add
-                new subcommands. Using `distutils` directly is considered deprecated,
-                please use `setuptools.command.build`.
-                """,
-                due_date=(2023, 12, 13),  # Warning introduced in 13 Jun 2022.
-                see_url="https://peps.python.org/pep-0632/",
-            )
-            self.sub_commands = _build.sub_commands
-        return super().get_sub_commands()
-
 
 class SubCommand(Protocol):
     """In order to support editable installations (see :pep:`660`) all

setuptools/tests/test_build.py

@@ -1,10 +1,6 @@
-from contextlib import contextmanager
-from setuptools import Command, SetuptoolsDeprecationWarning
+from setuptools import Command
 from setuptools.dist import Distribution
 from setuptools.command.build import build
-from distutils.command.build import build as distutils_build
-
-import pytest
 
 
 def test_distribution_gives_setuptools_build_obj(tmpdir_cwd):
@@ -24,15 +20,6 @@ def test_distribution_gives_setuptools_build_obj(tmpdir_cwd):
     assert isinstance(dist.get_command_obj("build"), build)
 
 
-@contextmanager
-def _restore_sub_commands():
-    orig = distutils_build.sub_commands[:]
-    try:
-        yield
-    finally:
-        distutils_build.sub_commands = orig
-
-
 class Subcommand(Command):
     """Dummy command to be used in tests"""
 
@@ -44,24 +31,3 @@ def finalize_options(self):
 
     def run(self):
         raise NotImplementedError("just to check if the command runs")
-
-
-@_restore_sub_commands()
-def test_subcommand_in_distutils(tmpdir_cwd):
-    """
-    Ensure that sub commands registered in ``distutils`` run,
-    after instructing the users to migrate to ``setuptools``.
-    """
-    dist = Distribution(
-        dict(
-            packages=[],
-            cmdclass={'subcommand': Subcommand},
-        )
-    )
-    distutils_build.sub_commands.append(('subcommand', None))
-
-    warning_msg = "please use .setuptools.command.build."
-    with pytest.warns(SetuptoolsDeprecationWarning, match=warning_msg):
-        # For backward compatibility, the subcommand should run anyway:
-        with pytest.raises(NotImplementedError, match="the command runs"):
-            dist.run_command("build")