[BUG] A simple C++ SWIG example fails when built through setuptools

[yurivict]

setuptools version

63.1.0

Python version

Python3.11

OS

FreeBSD

Additional environment information

No response

Description

Testcase: swig-testcase-method-is-missing.shar

This testcase builds a python module that is missing the xadd function that is present in the C++ class.

How to run:
make && python my.py

This fails:

Traceback (most recent call last):
  File "/usr/home/yuri/python/minimal-swig-demo-testcase/my.py", line 10, in <module>
    print(f'xadd->{c.xadd(1,4)}')
                   ^^^^^^
AttributeError: 'SwigPyObject' object has no attribute 'xadd'
swig/python detected a memory leak of type 'cls *', no destructor found.

This simplified example below succeeds when it is compiled using pure swig and build commands.

Simplified testcase that succeeds: swig-testcase-method-is-missing-simplified.shar

Expected behavior

n/a

How to Reproduce

See above.

Output

See above