how do you init your custom c module at app startup?

[tcaduser]

Versions

• Python : 3.9
• MacOS version : Ventura
• XCode Version :
• Cython version : 0.29

Describe the bug

My custom recipe successfully builds an archive. In addition copying the archive file into the recipes of my environment gets it installed into the image. However, the only way to get the module loaded is for me to add it to the command table in main.m

    NSLog(@"Initializing python");
    PyImport_AppendInittab("devsim_py3", PyInit_devsim_py3);
    Py_Initialize();

where I forward declare my init outside of the main function:

PyObject *PyInit_devsim_py3(void);

To Reproduce

build your own custom recipe which compiles a static archive creating a new module

Expected behavior

Document or make it easy

Logs

// REPLACE ME: Paste the build output containing the error

Screenshots

Additional context
Add any other context about the problem here.

[tcaduser]

to clarify what I am asking for. I have a custom recipe which can build my python module. It has the entry point function:

PyInit_devsim_py3

I am trying to understand how to get this imported in my application. Should I explicitly be using PyImport_AppendInittab in main.m? Should I be using a different naming convention for my PyInit function?

[tcaduser]

It looks like that python is patched to override the dlopen on an external shared library with the internal dlsym on the python executable.
https://groups.google.com/g/kivy-users/c/poh12uJ5DCM
https://discord.com/channels/423249981340778496/713442856190083094/989210942581669929

[tcaduser]

I now understand the last piece of the puzzle. What is needed is to create an empty .so file with the same name as your module. Then, the CustomBuiltinImporter.find_module method defined in main.m will be able to see the module, and call the appropriate PyInit function using dlsym on the application.

[github-actions]

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