Signals not received when building with link time optimization enabled and using asio as static library

[ni-tschuett]

We are using asio as a static library instead of header only, boost version 1.78. We instantiate a boost::asio::signal_set in the main thread of our application but do not receive any signals when building with link time optimization enabled (using gcc9/10). With making get_signal_state() (signal_set_service.ipp) BOOST_NOINLINE the issue does not occur and signals are again received properly.

[timblechmann]

the NOINLINE is a compiler barrier here. makes me wonder if there's any missing volatile (especially when meditating about https://stackoverflow.com/a/57679370)