On Aug 8, 2013, at 13:53, Jeremy Huddleston Sequoia <jerem...@macports.org> 
wrote:

> 
> On Aug 8, 2013, at 12:58, David Barto <dba...@visionpro.com> wrote:
> 
>> It appears that the following is missing from the configuration for 
>> libstdc++.
>> 
>> --enable-libstdcxx-threads
>> Enable C++11 threads support. If not explicitly specified, the configure 
>> process enables it if possible. It defaults to 'off' on Solaris 9, where it 
>> would break symbol versioning. This option can change the library ABI.
>> 
>> Yes, it changes the ABI, however for std::call_once to work, I think it is 
>> required. I don't think that the configuration process is setting it by 
>> default.
> 
> What makes you say that?  It looks like it is to me:

...

> Is your _GLIBCXX_HAS_GTHREADS undefined for some reason?  That doesn't make 
> sense...


Yeah, it looks fine to me:

libstdc++-v3/config.log:#define _GLIBCXX_HAS_GTHREADS 1

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