[v3] define string::pop_back()

[Eric Botcazou]

> Won't that fail to match string::max_size?

No, if it doesn't appear in the list, then it isn't matched by the regexp.

> For GNU I added a regex for that explicitly:
>
> +    _ZNKSs8max_size*;
> +    _ZNKSbIwSt11char_traitsIwESaIwEE8max_size*;

What is GNU here?  The Solaris version file is a massaged version of gnu.ver.
You patched gnu.ver incorrectly so symbols are now matched twice; you need to 
fix that by avoiding the double matching.

-- 
Eric Botcazou