hai shi <shihai1...@126.com> added the comment:

> It would be great to have a tool to check that all symbols exported on Unix 
> are also exported on Windows.

I write a demo in PR 24639(compare the stable_abi.dat to python3dll.c).
And the output result:
```
Some symbols from the limited API on windows are missing:
PyMarshal_WriteObjectToFile, PyThread_allocate_lock, PyObject_GC_IsFinalized, 
PyThread_ReInitTLS, PyThread_acquire_lock, PyThread_GetInfo, 
PyDictRevIterValue_Type, PyThread_get_thread_native_id, 
PyThread_start_new_thread, PyThread_set_stacksize, PyDictRevIterKey_Type, 
PyOS_AfterFork_Child, PyThread_create_key, PyThread_get_thread_ident, 
PyOS_BeforeFork, Py_BytesMain, PyThread_get_key_value, PyCodec_Unregister, 
PyInterpreterState_Get, PyMember_GetOne, PyThread_init_thread, 
PyInterpreterState_GetDict, PyThread_set_key_value, PyThread_delete_key, 
PyMarshal_WriteObjectToString, PyOS_AfterFork_Parent, 
PyThread_delete_key_value, PyObject_GC_IsTracked, 
PyMarshal_ReadObjectFromString, PyMarshal_WriteLongToFile, 
PyThread_exit_thread, PyThread_acquire_lock_timed, PyThread_get_stacksize, 
PyMember_SetOne, PyDictRevIterItem_Type, PyThread_free_lock, 
PyThread_release_lock

This error normally means that there are some missing symbols on windows.

Check if this was a mistake and if not, update the file containing the limited
API symbols. This file is located at:

PC/python3dll.c

You can read more about the limited API and its contracts at:

https://docs.python.org/3/c-api/stable.html

And in PEP 384:

https://www.python.org/dev/peps/pep-0384/

```

----------

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<https://bugs.python.org/issue43235>
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