External library is copied twice into the wheel

[delarosatrevin]

I'm not sure if this problem is related to issue #136.

I have been struggling to create a wheel for my package that has the following structure:

_emcore.so (python extension, install also some binaries) -> depends on ->
libemcore.so (using cmake, installed as "external library once" and install some binaries)

When calling auditwheel repair, it seems that the copylib function is called twice somehow for libemcore.so, so it creates two copies inside the wheel. One of the copies is later patched with other deps (e.g libtiff, libpng, etc) but the other not.

I have made a simple change that worked for me, checking if the soname was already in the dict before calling copylib. But I don't understand completely the whole process and I might be missing something. I also include the main change in PR #139 , but not sure if it helped in my case.

Please let me know if it can be useful that I create a PR with my changes.

[lkollar]

Do you have a reproducer for this? It would be great if you PR had a test case for this.