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

[amodra at gmail dot com]

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

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
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   Target Milestone|4.7.1                       |---

--- Comment #22 from Alan Modra <amodra at gmail dot com> 2012-04-10 23:53:16 UTC ---
Regarding the ABI change, would I be correct to say that the ABI was broken for
powerpc by
2012-02-10  Benjamin Kosnik  <bkoz@redhat.com>
            Jonathan Wakely  <jwakely.gcc@gmail.com>
since that particular patch introduced the dependency on having long long
atomics?  If I understand correctly, before that change code would use sync
builtins on powerpc throughout.  So code compiled before that date won't behave
correctly using a current libstdc++.so, which now uses mutexes.

I'm not trying to apportion blame, just pointing out that making libstdc++ use
atomics on powerpc *fixes* an ABI breakage for the great majority of cases.