AIX libstdc++ breakage after libgcc changes

[Jonathan Wakely]

On 4 November 2011 17:47, David Edelsohn wrote:
> Rainer and I greatly would appreciate some libstdc++ help debugging
> the AIX failure after the libgcc and gthr changes.  Please see PR
> 50982.
>
> The changes to gthr have caused differences when compiling atomic.cc,
> leading to a C++ error referring to pthread_once_t.

Is that an emutls platform?

Are the failures related to PR 50598?