RFC: ldconfig speedup

[Roland McGrath]

> This gives a larger cache.  Using 32-bit might be faster - and I don't
> see a collision probable.

It's possible, and that's enough.  Why are you worried about adding 25k to
ldconfig's RSS?

> Why ctime and not mtime?  Do you think that any modification will not
> touch cached information?

I don't quite understand the second question.  ctime is the true change
time that cannot be reset by normal OS action.  mtime can be changed to
anything.

> I'm using a separate file now (currently hardcoded to
> /etc/ld.so.cache.aux).  What is the right configure variable to get
> /var/cache ?

localstatedir is /var.


Thanks,
Roland