Windows: exporting a tuple leads to "A dynamic link library (DLL) initialization routine failed." about pythran

[paugier]

Additional information about this bug:

• I cannot reproduce on Linux with conda-forge.
• transonic 0.6.4 avoids this bug for most cases 🙂
• this bug can also be triggered by exporting a dictionary 🙁 , which is much more annoying because it is used for some extensions by Transonic and it cannot be simply avoided. I'm going to give a minimum example next week when I have access to a Windows machine.

[serge-sans-paille]

It's difficult for me to debug that one as I don't have access to a windows machine. I confirm I can't reproduce on windows. Could you try the following:

pythran -E a.py
sed -i -e 's/PyModule_AddObject/PyModule_AddObjectRef/g' a.cpp
pythran a.cpp
python -c 'import a; print(a.my_tuple)'

I don't see why this would change the behavior (it should actually introduce a leak), just trying.

[paugier]

Replacing PyModule_AddObject by PyModule_AddObjectRef changes nothing.

If I comment PyModule_AddObject(theModule, "my_tuple", my_tuple);, same thing.

If I comment static PyObject* my_tuple = to_python(__pythran_simple::my_tuple()());, the extension can be imported (but of course without my_tuple).

Then, I tried to replace this line with

Py_ssize_t size = 2;
PyObject* my_tuple = PyTuple_New(size);

I again get the same error.

Then, I tried to manually write a minimal cpp file exporting one tuple and I again get the same error, but I really don't know if it is correct.

#include <Python.h>

Py_ssize_t size = 2;
PyObject* my_tuple = PyTuple_New(size);

static PyMethodDef methods[] = {
    {NULL, NULL, 0, NULL}  /* Sentinel */
};

static struct PyModuleDef mod_def = {
    PyModuleDef_HEAD_INIT,
    "my_mod",
    "",
    -1,
    methods,
    NULL,
    NULL,
    NULL,
    NULL
};

PyObject *PyInit_my_mod(void)
{
    PyObject* theModule = PyModule_Create(&mod_def);
    PyModule_AddObject(theModule, "my_tuple", my_tuple);
    return theModule;
}

I tried to check on Linux but using pythran to compile such minimal cpp file does not work on Linux ("ImportError: dynamic module does not define module export function (PyInit_my_mod)").