https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90428
Bug ID: 90428
Summary: -Wredundant-move could warn for more cases
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
CC: mpolacek at gcc dot gnu.org
Target Milestone: ---
G++ gives no warnings for this:
#include <utility>
struct T { };
T f(const T& t)
{
return std::move(t);
}
T g()
{
return std::move(f());
}
The std::move in f does nothing, because the argument is const (and T does not
have a T(const T&&) constructor, so the conversion to an rvalue is useless).
The std::move in g also does nothing, because the argument is already an rvalue
(this might actually be a candidate for -Wpessimizing-move instead, since it
prevents elision).
