Re: [gcc 4.5 patch] Permit smaller hash tables for hash_map and hash_set

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

> > I have a few patches to make them better in some circumstances.   
> > These
> > ideas are incorporated in different from in the newer unordered_set
> > and unordered_map.  However, existing code still uses hash_map and
> > hash_set, so it may be useful to update them if we think that is OK.
>
> I believe there was a previous attempt to fix up this stuff. It was  
> not
> well-received, although I don't especially remember the details. At  
> this
> point, I think this kind of stuff should just be checked in.

Well, probably I'm the one not receiving well that kind of change in  
the past ;) Really, I'm still of the same opinion, that code should be  
just frozen by now, we do *not* want to deal with regressions, at  
least, certainly not me. In the case at issue, I have also some small  
concerns from the point of view of binary compatibility: are we really  
sure that two different binaries built before and after this change  
can interoperate smoothly?

Thanks,
Paolo.