[issue6011] python doesn't build if prefix contains non-ascii characters

[STINNER Victor]

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

> Fatal Python error: Py_Initialize: Unable to get the locale encoding
> SystemError: NULL result without error in PyObject_Call

Gotcha! r86341 fixes PyUnicode_EncodeFS(): raise an error if _Py_char2wchar_() fails.

The real problem is that PREFIX is not decoded using _Py_charw2char(), but using a C hack: >L"" PREFIX<. It should use _Py_charw2char() as I did for VPATH in r85800.

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<http://bugs.python.org/issue6011>
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