Remove deprecation warning for config_settings --global-option

This interface is not super stable/usable yet, so it should be fine
to remove.

setuptools/build_meta.py

@@ -284,10 +284,9 @@ def _arbitrary_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
  ['foo']
  >>> list(fn({'--build-option': 'foo bar'}))
  ['foo', 'bar']
- >>> warnings.simplefilter('error', SetuptoolsDeprecationWarning)
  >>> list(fn({'--global-option': 'foo'})) # doctest: +IGNORE_EXCEPTION_DETAIL
  Traceback (most recent call last):
- SetuptoolsDeprecationWarning: ...arguments given via `--global-option`...
+ ValueError: Incompatible ...`foo`...
  """
  args = self._get_config("--global-option", config_settings)
  global_opts = self._valid_global_options()
@@ -301,15 +300,8 @@ def _arbitrary_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
  yield from self._get_config("--build-option", config_settings)
 
  if bad_args:
- SetuptoolsDeprecationWarning.emit(
- "Incompatible `config_settings` passed to build backend.",
- f"""
- The arguments {bad_args!r} were given via `--global-option`.
- Please use `--build-option` instead,
- `--global-option` is reserved for flags like `--verbose` or `--quiet`.
- """,
- due_date=(2023, 9, 26), # Warning introduced in v64.0.1, 11/Aug/2022.
- )
+ msg = f"Incompatible `config_settings`: {bad_args!r} ({config_settings!r})"
+ raise ValueError(msg)
 
 
 class _BuildMetaBackend(_ConfigSettingsTranslator):

setuptools/tests/test_build_meta.py

@@ -700,25 +700,6 @@ def _assert_link_tree(self, parent_dir):
  for file in files:
  assert file.is_symlink() or os.stat(file).st_nlink > 0
 
- @pytest.mark.filterwarnings("ignore::setuptools.SetuptoolsDeprecationWarning")
- # Since the backend is running via a process pool, in some operating systems
- # we may have problems to make assertions based on warnings/stdout/stderr...
- # So the best is to ignore them for the time being.
- def test_editable_with_global_option_still_works(self, tmpdir_cwd):
- """The usage of --global-option is now discouraged in favour of --build-option.
- This is required to make more sense of the provided scape hatch and align with
- previous pip behaviour. See pypa/setuptools#1928.
- """
- path.build({**self._simple_pyproject_example, '_meta': {}})
- build_backend = self.get_build_backend()
- assert not Path("build").exists()
-
- cfg = {"--global-option": ["--mode", "strict"]}
- build_backend.prepare_metadata_for_build_editable("_meta", cfg)
- build_backend.build_editable("temp", cfg, "_meta")
-
- self._assert_link_tree(next(Path("build").glob("__editable__.*")))
-
  def test_editable_without_config_settings(self, tmpdir_cwd):
  """
  Sanity check to ensure tests with --mode=strict are different from the ones