I think this is a recent regression:
-----------------------------
int memory_consumption(const int &t) { return sizeof(t); }
int s;
int g() { return memory_consumption(s); }
-----------------------------
deal.II> c++ -c -W -Wunused ../x.cc
../x.cc:1:5: warning: unused parameter 't'
Quite formally, it is probably correct to say that the parameter is unused
because we don't read or write from/to it. But I think it's still a kind of
use to determine its size and the warning should be suppressed in my
opinion.
In the meantime, the warning can of course be trivially suppressed by
saying
sizeof(int)
instead.
W.
--
Summary: [4.5 regression] Argument flagged as unused despite use
in sizeof()
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=41109
