[Pyfltk-user] Mystery swig error when exiting pyfltk program

[Dima K. <di...@se...>]

Hello!

Can one of you help debugging a mystery error please? I have this
script, that does more-or-less nothing:

  import Fl_Gl_Image_Widget
  from fltk import *

  def func():
      5

  window = Fl_Window(100,200,"xxx")
  window.end()
  window.show()

  Fl.run()

I run it, the window pops up, I press Escape, the application exits.
This is right. But as it exits it prints to the console:

  swig/python detected a memory leak of type 'Fl_Window *', no destructor found.

Does this mean something to any of you? I can make this message go away
by doing unrelated-looking things. I can remove the definition of func()
above (which doesn't do anything anyway). Or I can remove the "import
Fl_Gl_Image_Widget" (which also doesn't do anything). Doing any of these
silences the error.

This is on a very recent Debian, running everything from packages:

  dima@shorty:~/projects/mrcam$ dpkg -l python3-fltk python3-gl-image-display libfltk1.4
  ii  python3-fltk:amd64       1.4.2.0-2    amd64        Python wrapper for the Fast Light Toolkit
  ii  python3-gl-image-display 0.23-1       amd64        OpenGL-based image visualizer
  ii  libfltk1.4:amd64 1.4.3-1      amd64        Fast Light Toolkit - main shared library

I just upgraded libfltk1.4 from 1.4.2-7; it made no difference.

python3-gl-image-display is mine:

  https://github.com/dkogan/GL_image_display

It also uses swig. Note that here I'm just doing the import; I'm NOT
actually using it.

Suggestions? Since unrelated-looking things make the problem disappear
for me, I wouldn't be surprised if yall have trouble reproducing.

Suggestions?

Thanks!