https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106276
Bug ID: 106276
Summary: Missing -Wpessimizing-move warning
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
Looks like we're missing a warning on the std::move line here:
namespace std {
template <typename _Tp> _Tp &&move(_Tp &&);
}
char take_buffer;
struct label_text {
label_text take() { return std::move(label_text(&take_buffer)); }
label_text(char *);
};
$ xclang++ -c -Wall -W line-map.ii
line-map.ii:6:30: warning: moving a temporary object prevents copy elision
[-Wpessimizing-move]
label_text take() { return std::move(label_text(&take_buffer)); }
^
line-map.ii:6:30: note: remove std::move call here
label_text take() { return std::move(label_text(&take_buffer)); }
^~~~~~~~~~ ~
$ xg++ -c -Wall -W line-map.ii
$
