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

[pmitchell.adbe at gmail dot com]

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

--- Comment #26 from Paul Adobe <pmitchell.adbe at gmail dot com> ---
It may be interesting to note that we recently ended up tracking a change in
glibc to making this a problem on x86_64 architectures. Apparently when they
refactored pthread_once in glibc patch 2.17.288 it changed the problem from an
arm/powerpc only problem to an all-architecture problem. (cent7.7 had recently
updated to .292, which made this quite evident)