cpython to pyd binary - "long" converted to "int" badly before shift / division operator

cython 0.29 python 3.6.6 compiler mingw-w64 os windows 7

command used: python setup.py build_ext --inplace

setup.py:

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize
extensions = [Extension("shiftoperator", ['shiftoperator.py']]
setup(
    ext_modules=cythonize(extensions)
)

shiftoperator.py:

#!python
#cython: language_level=3
def longtoint():
    value = 80082 # int using more than 2 bytes == long
    print(value)
    shiftedby3 = value>>3
    dividedby8 = value//8
    print(shiftedby3)
    print(dividedby8)
    shiftedby3 = 80082>>3
    dividedby8 = 80082//8
    print(shiftedby3)
    print(dividedby8)

test_shift.py

import shiftoperator
shiftoperator.longtoint()

with cpython shiftoperator.py library used:

C:\scripts\tests>python test_shift.py
80082
10010
10010
10010
10010

with binary shiftoperator.cp36-win_amd64.pyd used:

C:\scripts\tests>python test_shift.py
80082
1818
1818
10010
10010

it seems the higher bit (65536 before shifting / 8192 after shifting) is dropped before the shifting process is done in case original long is saved on a variable

Can you check? Thks

[ducminh-phan]

@gui36 I have a similar issue with my code and had a discussion in the cython-users Google group. The problem is in the header pyport.h, in which SIZEOF_VOID_P is defined based on whether MS_WIN64 is defined or not. The solution is to pass -DMS_WIN64 when compiling with MinGW.

[filips123]

Is there any other possibility for building Cython packages with MinGW? Or maybe official Python team needs to support something?

As MinGW is the only lightweight compiler, in comparison to VS Build Tools, it would be very useful to support it.