[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should

["mark at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #38 from mark at codesourcery dot com  2007-05-04 03:47 -------
Subject: Re:  [4.0/4.1/4.2/4.3 Regression] placement
 new does not change the dynamic type as it should

rguenth at gcc dot gnu dot org wrote:
> ------- Comment #36 from rguenth at gcc dot gnu dot org  2007-05-03 21:59 -------
> Well, the patch in comment #33 really does what I did with the patch to
> libstdc++.

I think that Ian's second patch (the heavy hammer of a memory clobber,
generated by the front end) is also reasonable.  It's more heavy-handed
than Ian's earlier solution, but certainly less intrusive and easier to
get right.

I think that either of these solutions will make user code work as
expected, which is the most important consideration.  I guess my
inclination would be to go with the heavy hammer, until/unless we start
finding real code that's seriously impacted.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286