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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/66146] call_once not C++11-compliant on ppc64le
Date: Mon, 15 Feb 2021 15:00:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66146

--- Comment #43 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Rich Felker from comment #42)
> I'm confused why this is an ABI boundary at all. Was the old implementati=
on
> of std::call_once being inlined into callers?

Yes, it's a function template:

https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dblob;f=3Dlibstdc%2B%2B-v3/include/=
std/mutex;h=3D12b7e548d179c3a2cb0ed65b6e113031f11293f6;hb=3Dee5c3db6c5b2c33=
32912fb4c9cfa2864569ebd9a#l710

The call to __gthread_once (which is a weak alias for pthread_once) is on l=
ine
729.=