[Feature Request] Public interface for _msvccompiler._get_vc_env

pytorch's repository is using an import of setuptools / distutil.

https://github.com/pytorch/pytorch/blob/main/tools/build_pytorch_libs.py#L17-L25

def _get_vc_env(vc_arch: str) -> dict[str, str]:
    try:
        from setuptools import distutils  # type: ignore[import]

        return distutils._msvccompiler._get_vc_env(vc_arch)  # type: ignore[no-any-return]
    except AttributeError:
        from setuptools._distutils import _msvccompiler  # type: ignore[import]

        return _msvccompiler._get_vc_env(vc_arch)  # type: ignore[no-any-return]

However, its location/implementation is being changed and causing the errors as follows:

AttributeError: module 'distutils._msvccompiler' has no attribute '_get_vc_env'

Example issues:
https://github.com/pypa/setuptools/issues/4874
https://github.com/pytorch/pytorch/issues/148877
https://github.com/pytorch/pytorch/issues/141319

Could you please open a reliable public interface for _get_vc_env , so pytorch 's repository could be updated to use that import for the future versions?

Start by reviewing the _get_vc_env call in pytorch's tools/build_pytorch_libs.py and the reported AttributeError cases. Trace where _msvccompiler currently provides this functionality and determine the stable public interface needed for future callers. Done means callers can access the Visual C++ environment without relying on the private attribute.