I think this is from after 4.4 branched:
----------------------
template <typename TT> struct InputIterator
{
InputIterator ()
{
TT i;
(void)*i; // require dereference operator
}
};
InputIterator<int *> i;
---------------------
> c++ -c deal.II/source/dofs/dof_renumbering.cc -W -Wall
deal.II/source/dofs/dof_renumbering.cc: In constructor
'InputIterator<TT>::InputIterator() [with TT = int*]':
deal.II/source/dofs/dof_renumbering.cc:10: instantiated from here
deal.II/source/dofs/dof_renumbering.cc:6: warning: value computed is not used
That's obviously bogus, the compiler warns about a statement that is
explicitly cast to 'void' so there is no computed value any more.
The code is culled from boost's concepts checks, so this is going to hit
quite a number of people.
W.
--
Summary: [4.5 regression] Wrong "value computed is not used"
warning
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bangerth at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39875
