[Swig-devel] Leak when using vtable in Python wrapper code

[Johan H. <ha...@si...>]

Hello!

I have found a leak when using vtables for director methods in wrapper code 
for Python.

Please consider the following minimal example that reproduce the leak 
(Need to be run on linux/unix system to be able to print memory usage...)

  make withoutleak
  python runleaktest.py

  make withleak
  python runleaktest.py

It seems that the leak is caused by a self reference by the PyObject returned 
by PyObject_GetAttr in the generated swig_get_method() in leaktest_wrap.h. So 
when the Bar instance get out of scope the ref count is reduced. But due to 
the reference hold by the cached method the instance is not destroyed.

I do not know if there are an easy fix, other than compiling without vtable?

Best regards,

Johan