[Bug bootstrap/43170] gcc 4.5 20100218 bootstrap compare fails on os x 10.6

["rwild at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #39 from rwild at gcc dot gnu dot org  2010-06-02 17:04 -------
Can you (someone with darwin) just take the configure test from comment #13,
build it, and run it under various load on your system, to see whether it
produces unstable results with a compiler from the previous stage?  Thanks.

Just to be sure, this is not just about the a_in_other_thread pointer lacking a
volatile qualifier, or use of proper exclusion primitive?

Here's the source again, for reference:

#include <pthread.h>
             __thread int a; 
             static int *a_in_other_thread;
             static void *
             thread_func (void *arg)
             {
               a_in_other_thread = &a;
               return (void *)0;
             }
int
main ()
{
pthread_t thread;
             void *thread_retval;
             int *a_in_main_thread;
             if (pthread_create (&thread, (pthread_attr_t *)0,
                                 thread_func, (void *)0))
               return 0;
             a_in_main_thread = &a;
             if (pthread_join (thread, &thread_retval))
               return 0;
             return (a_in_other_thread == a_in_main_thread);
  ;
  return 0;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43170