[Bug target/45693] [4.6 regression] All Tru64 UNIX EH tests fail

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45693

--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> 2010-09-27 18:34:46 UTC ---
(In reply to comment #4)
> (In reply to comment #3)
> > But that support was present before, and still GCC_CHECK_TLS didn't
> > detect it before Iain's patch.  Something is certainly fishy here...
> 
> His patch was explicitly to fix checking for TLS when emulated TLS was used. 
> Sometimes it would detect it as working and other times it would not.

As I recall, the patch was to circumvent a race condition - which manifest most
frequently in the decision as to whether libgomp used TLS or not.

It's odd that after this time a problem should show in libstdc++ (which was
never, AFAIR flagged up in the original problem series).

As for a platform with TLS  - Darwin is regularly testing libstdc++ on powepc,
and x86 .. so there must be some corner case at work.