Merge with distutils@d7ffdb9c7

[jaraco]

• Distutils C++ support
• 👹 Feed the hobgoblins (delint).
• Adjust tests further to accommodate C++ support.
• 👹 Feed the hobgoblins (delint).
• Ignore sysconfig variables for LDCXXSHARED as it appears not to exist on PyPy.
• ENH: Extension should be able to accept PathLike sources objects
• Adjust expectation to match behavior.
• For consistency, ensure Extension.sources is always a pathlib.Path object and adjust expectations in tests.
• When computing input_opt, ensure src is a string (when it could be a pathlib Path).
• In filelist, allow for self.files to be pathlib objects.
• Revert "Disable cygwin tests for now. Ref test_cygwin job failing after adding ruff #3921"
• find_library_file: port from doctest to normal test and fix for cygwin
• test_customize_compiler_with_msvc_python: skip for cygwin
• Prefer f-strings
• Remove r string now that docstring is gone.
• 👹 Feed the hobgoblins (delint).
• 👹 Feed the hobgoblins (delint).
• Allow path objects
• Need to include 'three' in the input.
• Consolidate str and Path handling.
• Expand convert_path to also accept pathlib.Path objects.
• Prefer simply 'pathlib' for import.
• Extract a singledispatchmethod _copy for handling the copy of each data file.
• Use explicit registration for compatibility with older Pythons.
• Prefer os.PathLike in convert_path
• Simply accept pathlib objects and convert them early for compatibilty with upstream.
• Convert needs to accept None for Setuptools' sake.
• In test_convert_path, utilize posixpath.join and ntpath.join for maximum compatibility with other libraries.
• Wrap paths in PurePosixPath to ensure that any WindowsPaths don't get backslashes.
• convert_path no longer fails if passed a path with a trailing slash. Instead, trailing slashes are stripped just as they are with pathlib.Path.
• convert_path now converts to a platform-native path.Path, but then calls .as_posix() on it.
• Separate test_convert_path into two tests to avoid interactions in monkeypatching os.path.
• Remove expectation that a ValueError is raised for data_files being drive-relative absolute on Windows.
• Simplify convert_path by simply relying on the logic in PurePath.
• Harmonize convert_path tests across Unix and Windows.
• Consolidate convert_path tests and just generate the expected value in a platform-sensitive way. Should fix failures on mingw.
• Use simple import
• venv_install_options: add missing clear_argv fixture
• CI: add a job for running tests under MSVC CPython with GCC as the default compiler
• mingw: make get_msvcr() a noop
• Remove unused RangeMap
• Harmonize '-shared' parameter for C and C++ in Mingw32CCompiler
• In sysconfig.customize_compiler, initialize ldcxxshared from config vars.
• Refactored customize_compiler to reduce logical branches and extract _add_flags logic.
• Don't add flags when the value is None, such as when on PyPy, LDCXXSHARED is unset.
• Rely on monkeysession to monkeypatch.
• Apply isort. Ref Apply Scientific Python repo-review suggestions distutils#240

Summary of changes

Closes

Pull Request Checklist

• Changes have tests
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[jaraco]

After pypa/distutils#275, I'm going to open a new PR.