Building on Windows fails with a UnicodeDecodeError

I tried to build this example on Windows, but ran into an error.

Versions:

• Windows 10 Pro 64bit
• Python 3.6.1 32 bit
• CMake 3.9.1

D:\github>pip install .\cmake_example
Processing o:\github\cmake_example
Installing collected packages: cmake-example
  Running setup.py install for cmake-example ... error
Exception:
Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 73, in console_to_str
    return s.decode(sys.__stdout__.encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x81 in position 48: invalid start byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\commands\install.py", line 342, in run
    prefix=options.prefix_path,
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_set.py", line 784, in install
    **kwargs
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install.py", line 878, in install
    spinner=spinner,
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 676, in call_subprocess
    line = console_to_str(proc.stdout.readline())
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 75, in console_to_str
    return s.decode('utf_8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x81 in position 48: invalid start byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\commands\install.py", line 385, in run
    requirement_set.cleanup_files()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_set.py", line 729, in cleanup_files
    req.remove_temporary_source()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install.py", line 977, in remove_temporary_source
    rmtree(self.source_dir)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 49, in wrapped_f
    return Retrying(*dargs, **dkw).call(f, *args, **kw)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 212, in call
    raise attempt.get()
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 247, in get
    six.reraise(self.value[0], self.value[1], self.value[2])
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\six.py", line 686, in reraise
    raise value
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\_vendor\retrying.py", line 200, in call
    attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 102, in rmtree
    onerror=rmtree_errorhandler)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 494, in rmtree
    return _rmtree_unsafe(path, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "c:\program files (x86)\python36-32\lib\shutil.py", line 393, in _rmtree_unsafe
    onerror(os.rmdir, path, sys.exc_info())
  File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 114, in rmtree_errorhandler
    func(path)
PermissionError: [WinError 32] Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird: 'C:\\Users\\Sysadmin\\AppData\\Local\\Temp\\pip-r3e3669_-build\\build\\temp.win32-3.6\\Release'

No project file or test is named; start by reproducing pip install .\cmake_example on Windows with the reported Python and CMake versions, then trace whether the failure comes from build output decoding or cleanup. Done means the example builds successfully without the UnicodeDecodeError and subsequent permission failure.