STINNER Victor added the comment:

I'm surprised by the test_codecencodings_iso2022 failures. Example:

======================================================================
FAIL: test_incrementaldecoder (test.test_codecencodings_iso2022.Test_ISO2022_KR)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\GitHub\cpython\lib\test\multibytecodec_support.py", line 208, in 
test_incrementaldecoder
    self.assertEqual(ostream.getvalue(), self.tstring[1])
AssertionError: b'\xe[334 
chars]\x80\n\xed\x9a\xa8\xec\x9c\xa8\xec\xa0\x81\xec[1668 chars]4.\n' != 
b'\xe[334 chars]\x80\r\n\xed\x9a\xa8\xec\x9c\xa8\xec\xa0\x81\x[1682 chars]\r\n'



It looks like Python uses the wrong encoding to decode stdout of child 
processes:

======================================================================
ERROR: test_build_ext (distutils.tests.test_build_ext.BuildExtTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\GitHub\cpython\lib\distutils\tests\test_build_ext.py", line 61, in 
test_build_ext
    cmd.run()
  File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 338, in run
    self.build_extensions()
  File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 447, in 
build_extensions
    self._build_extensions_serial()
  File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 472, in 
_build_extensions_serial
    self.build_extension(ext)
  File "E:\GitHub\cpython\lib\distutils\command\build_ext.py", line 532, in 
build_extension
    depends=ext.depends)
  File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 306, in compile
    self.initialize()
  File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 199, in 
initialize
    vc_env = _get_vc_env(plat_spec)
  File "E:\GitHub\cpython\lib\distutils\_msvccompiler.py", line 92, in 
_get_vc_env
    universal_newlines=True,
  File "E:\GitHub\cpython\lib\subprocess.py", line 636, in check_output
    **kwargs).stdout
  File "E:\GitHub\cpython\lib\subprocess.py", line 705, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
  File "E:\GitHub\cpython\lib\subprocess.py", line 1062, in communicate
    stdout = self.stdout.read()
  File "E:\GitHub\cpython\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 49: 
character maps to <undefined>

It would help to add a print() to lib\distutils\_msvccompiler.py:92 to get the 
executed command, then run manually the command, and see non-ASCII characters 
in the output.

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26226>
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