[Patch, RFA] libstdc++/24975: aliasing rules violations in set/multiset

[Paolo Carlini]

Gabriel Dos Reis wrote:

>| Richard confirmed that my fix below cures the problem - indeed is pretty
>| much straightforward and safe from the binary compatibility point of
>| view - but I'm still wondering whether we can do better (e.g., less
>| redundancy in stl_tree.h), still paying the highest attention to those
>| general requirements. Otherwise, I mean to apply it soon.
>
>I thought we had more than that -- funny though, I
>came across a year ago but said "hum, who cares?" :-(
>  
>
Eh, same here, more or less :-( :-(

Anyway, a quich audit didn't reveal more, but we are certainly going to
pay more attention to such issues.

Thanks for your feedback,
Paolo.