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I've done some work with golang. Do not know if the libraries I used were bad, but they did some nasty things before main. Some even saw it as okay to call panic

I think the C++ version of the zeromq library could initialize a context in a static initializer, and zmq contexts involve creating a thread.

https://zeromq.org/get-started/?language=cpp#

there's 5 listed for c++ which one creates threads before main()?

It's been a long time, so I might be wrong, but with zmqpp[1] make a global zmqpp::context and I believe it will create threads before main().

1: https://github.com/zeromq/zmqpp

Windows will have a few threads for doing IO at program startup.