http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50196

Jack Howarth <howarth at nitro dot med.uc.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |howarth at nitro dot
                   |                            |med.uc.edu

--- Comment #10 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-01-28 
18:56:03 UTC ---
(In reply to comment #8)
> Should be fixed for 4.7 - std::timed_mutex and std::recursive_mutex are still
> not available, because they require a library function which darwin doesn't
> provide
> 

Are you sure this is true of Lion? If you look at 3.ii.diff attached to
PR51906, you will see that even when targeting the 10.6 API on Lion, the
__GTHREAD_RECURSIVE_MUTEX_INIT is defined (unlike Snow Leopard).

 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906#c12

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