Rainer Orth <ro at gcc dot> changed:

           What    |Removed                     |Added
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.09.27 18:12:02
               date|                            |
                 CC|                            |iains at gcc dot
     Ever Confirmed|0                           |1

--- Comment #1 from Rainer Orth <ro at gcc dot> 2010-09-27 18:12:02 UTC 
A reghunt revealed that this patch

2010-06-09  Iain Sandoe  <>

       PR bootstrap/43170
       * tls.m4 (GCC_CHECK_TLS): Add volatile qualifier to the test 
       references.  Move the main () test reference ahead of 
       pthread_create().  Add a comment to explain the requirements
       of the test.

is the culprit.  After it, libstdc++-v3/configure incorrectly concludes that
alpha-dec-osf5.1 has TLS support.

I've yet to determine how the change could have this effect.

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