CCompiler self.include_dirs modified during each compile()

[mdavidsaver]

cf. 9f9a3e5

setuptools/setuptools/_distutils/ccompiler.py

Lines 390 to 398 in ba3995e

	if include_dirs is None:
	include_dirs = self.include_dirs
	elif isinstance(include_dirs, (list, tuple)):
	include_dirs = list(include_dirs) + (self.include_dirs or [])
	else:
	raise TypeError("'include_dirs' (if supplied) must be a list of strings")
	# add include dirs for class
	include_dirs += self.__class__.include_dirs

setuptools/setuptools/_distutils/_msvccompiler.py

Lines 228 to 233 in ba3995e

	def _configure(cls, vc_env):
	"""
	Set class-level include/lib dirs.
	"""
	cls.include_dirs = cls._parse_path(vc_env.get('include', ''))
	cls.library_dirs = cls._parse_path(vc_env.get('lib', ''))

With msvc, the class include_dirs is not empty, and will be appended to the instance include_dirs for each compile(..., include_dirs=None) (which is the default). With enough calls, an impressively long argument list accumulates, resulting in an error:

FileNotFoundError: [WinError 206] The filename or extension is too long

I think that one simple fix would be:

 if include_dirs is None: 
     include_dirs = self.include_dirs[:] # make a copy

[mrbean-bremen]

This also broke our NumPy builds with Python 3.11 under Windows. The above-mentioned change fixes this. Would it help to make a PR with the fix?