[issue12801] C realpath not used by os.path.realpath

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

i12801.patch is not correct: on Windows, you should never encode a filename to bytes. Use PyUnicode_Decode() + _Py_wrealpath(), or a #ifdef (as many other posixmodule functions).

I prefer to reuse _Py_wrealpath because we will have to add special cases: realpath(NULL) and also maybe canonicalize_file_name().

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<http://bugs.python.org/issue12801>
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