[PATCH] fix PR target/54407

[Jack Howarth]

On Tue, Oct 16, 2012 at 12:26:39PM -0700, Mike Stump wrote:
> On Oct 16, 2012, at 10:28 AM, Dominique Dhumieres <dominiq@lps.ens.fr> wrote:
> >> I'm not a big fan of just hiding the bug; why not just xfail it of darwin10 and darwin[5-9]?
> > 
> > I am viewing xfail for bugs that have a chance to be fixed some day.
> > Since the bug is fixed for darwin11 and 12, I doubt that Apple will backport it.
> > I would prefer a dg-skip-if may be with a comment about the bug.
> 
> Not a huge fan of skip either, but, if you guys really want to, that's ok by me.  Please do include a comment and a pointer to the Apple bug report number if available else a pointer to the gcc PR number where we talk about why we are skipping it.  Something like: OS bug, see gcc PR/x.  Short, easy to understand and one can read the PR for details, if one is really, really bored.

Mike,
   I can't absolutely swear that the pthread issue fixed in radr://7905357. "testcase 20_util/shared_ptr/thread/default_weaktoshared.cc thread handling bug",
is the same bug. Certainly Apple gave pthreads in libSystem some TLC in Lion which will never be backported to earlier OS releases.
     Jack