[Bug libstdc++/52839] double free or corruption running tr1/.../default_weaktoshared.exe

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52839

--- Comment #26 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-12 08:30:17 UTC ---
(In reply to comment #25)
> If we make an ABI switch at some point, should we move over to relying just on
> atomics and the libatomic fallbacks (assuming/hoping libatomic exists by then)?

Yes, unfortunately neither an ABI switch nor libatomic is not going to happen
in the short term, the priority right now is to fix this regression in 4.7.0

I hope to get time in the next few days to partially revert the acinclude.m4
changes that cause _GLIBCXX_ATOMIC_BUILTINS to rely on 8-byte CAS, but I'd like
to hear from Benjamin first.

> Also, refcounting in basic_string has bugs too.  Do you see other areas of
> libstdc++ that could use a review of the synchronization bits?

std::locale also uses atomics for refcounting.