[Bug libstdc++/54847] --enable-libstdcxx-time=yes non-functional on darwin

[jeremyhu at macports dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847

--- Comment #4 from Jeremy Huddleston Sequoia <jeremyhu at macports dot org> 2012-10-07 18:35:24 UTC ---
(In reply to comment #3)
> As far as Darwin is concerned, simply, somebody knowing the target well has to
> work out the details. So far, we only made sure that things work reasonably
> well on GNU/Linux machines. Patches are welcome, as usual.

I know the target, and I'm willing to answer any questions you may have. 
Unfortunately as gcc is GPL3, I can't look at the code or offer services beyond
that.

Is there a particular reason why the check for nanosleep and sched_yield check
for _POSIX_TIMERS > 0?  That seems peculiar to me.