2009-01-04  Richard Guenther  <rguenther@suse.de>

	PR libstdc++/38720
	* include/ext/pointer.h (_Relative_pointer_impl): Use an unsigned
	integer type for storage, arithmetic and comparisons.
	* testsuite/ext/ext_pointer/1_neg.cc: Adjust line numbers.

From-SVN: r143058