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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/55394] Using call_once without -lpthread compiles
 without warning
Date: Tue, 20 Oct 2020 08:29:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55394

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's not plausible because it doesn't work for non-pthreads targets where
gthr-default.h is not gthr-posix.h

We can't use pthread_once anyway, see PR 66146, so I'm rewriting it entirel=
y in
terms of either futexes or condition variables.=