GC/destruction segfault

[iamed2]

Something is segfaulting when the gc runs and things are destroyed in Cxx.destruct. I'm not sure what, and it may be my fault, so I reduced to a small test file and put that in a gist.

I may be doing something wrong with the C++ code, but I made a similar example in C++ and it did not segfault. I am probably very bad at C++ though (AWSCxx is the most C++ I've ever written).

https://gist.github.com/iamed2/e32162dda0ddb6a0ac3746acaabbe68f

[Keno]

Sometimes C++ code has assumptions on destruction time that are not obeyed by julia code. I'll take a look at your code later and see if that's what's happening here.

[iamed2]

Thank you very much!

[iamed2]

@keno Had a chance to look at this yet?

[iamed2]

A discovery: if I change this line:

cpp_key = icxx"$iterator->first;"

to this line:

cpp_key = icxx"""auto key_item = $iterator->first;
    key_item;"""

the problem goes away.