[Bug libstdc++/66146] call_once not C++11-compliant on ppc64le

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> Thanks, Martin. So maybe something like this:

This happens on almost all non-x86 machines.  I tested it on aarch64 and we had
the same failure as powerpc.