python-cython C++ support patch

[Marco Atzeri]

On 29.01.2021 15:18, Marco Atzeri wrote:
> On 29.01.2021 11:31, Masamichi Hosoda wrote:
>> Hi,
>>
>> I've found that modules built by python-cython with C++ could not be 
>> loaded.
>> If I understand correctly, the following patch fixes it.
>> Would you like to apply this patch to the package?
>>
>> ```
>> --- a/Cython-0.29.21/Cython/Utility/ModuleSetupCode.c
>> +++ b/Cython-0.29.21/Cython/Utility/ModuleSetupCode.c
>> @@ -709,7 +709,11 @@
>>   /////////////// PyModInitFuncType.proto ///////////////
>>   #ifndef CYTHON_NO_PYINIT_EXPORT
>> +#ifdef __cplusplus
>> +#define __Pyx_PyMODINIT_FUNC  extern "C" PyObject *
>> +#else
>>   #define __Pyx_PyMODINIT_FUNC  PyObject *
>> +#endif
>>   #elif PY_MAJOR_VERSION < 3
>>   // Py2: define this to void manually because PyMODINIT_FUNC adds 
>> __declspec(dllexport) to it's definition.
>> ```
>>

have you considered that you just need to define
CYTHON_NO_PYINIT_EXPORT ?

the portion of the code below your change has already the
ifdef __cplusplus semantic

Have you proposed it upstream ? It does not seem
a change restricted to Cygwin

Any way I see no "wrongness" to add it on the Cython rebuild

Regards
Marco