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| """ | |
| Temporary shim module to indirect the bits of distutils we need from setuptools/distutils while providing useful | |
| error messages beyond `No module named 'distutils' on Python >= 3.12, or when setuptools' vendored distutils is broken. | |
| This is a compromise to avoid a hard-dep on setuptools for Python >= 3.12, since many users don't need runtime compilation support from CFFI. | |
| """ | |
| import sys | |
| try: | |
| # import setuptools first; this is the most robust way to ensure its embedded distutils is available | |
| # (the .pth shim should usually work, but this is even more robust) | |
| import setuptools | |
| except Exception as ex: | |
| if sys.version_info >= (3, 12): | |
| # Python 3.12 has no built-in distutils to fall back on, so any import problem is fatal | |
| raise Exception("This CFFI feature requires setuptools on Python >= 3.12. The setuptools module is missing or non-functional.") from ex | |
| # silently ignore on older Pythons (support fallback to stdlib distutils where available) | |
| else: | |
| del setuptools | |
| try: | |
| # bring in just the bits of distutils we need, whether they really came from setuptools or stdlib-embedded distutils | |
| from distutils import log, sysconfig | |
| from distutils.ccompiler import CCompiler | |
| from distutils.command.build_ext import build_ext | |
| from distutils.core import Distribution, Extension | |
| from distutils.dir_util import mkpath | |
| from distutils.errors import DistutilsSetupError, CompileError, LinkError | |
| from distutils.log import set_threshold, set_verbosity | |
| if sys.platform == 'win32': | |
| from distutils.msvc9compiler import MSVCCompiler | |
| except Exception as ex: | |
| if sys.version_info >= (3, 12): | |
| raise Exception("This CFFI feature requires setuptools on Python >= 3.12. Please install the setuptools package.") from ex | |
| # anything older, just let the underlying distutils import error fly | |
| raise Exception("This CFFI feature requires distutils. Please install the distutils or setuptools package.") from ex | |
| del sys | |