Large file support available

Large file support is now compiled by default if available.  (Use
--disable-largefile to turn it off.  That's what Autoconf gives us.)

But:

The zlib library uses unsigned ints and unsigned longs for file positions
and offsets.  Depending on how that is used in detail and depending on how
zlib itself is compiled, this may or may not work.

The tar file format (POSIX and traditional) has an inherent limitation on
the size of the member files of 2^33 bytes (pg_dump currently only handles
2^30).  The result in that case continues to be a broken archive.  The GNU
tar format has an extension that would handle 2^89 bytes.  This may be
something interesting to work on.

-- 
Peter Eisentraut   peter_e@gmx.net