2011-09-15  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/tuple (make_tuple, forward_as_tuple): Declare constexpr.
	(_Tuple_impl<>::_Tuple_impl(_Tuple_impl<>&&)): Likewise.
	* testsuite/20_util/tuple/creation_functions/constexpr.cc: Enable
	make_tuple test.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust dg-warning
	line number.

From-SVN: r178904