[Bug c++/87300] -Wredundant-move gives false positives in C++11 mode

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87300

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes 

The first published standard to include the change was C++14 but it's a DR
against the previous standard. That means it's fixing a bug in the previous
standard.

The -std=c++11 flag is documented to mean C++11 *plus amendments*.

Also, the point of the warning is to alert you to pessimised code, which is
definitely the case here. Without the std::move the code compiles and can elide
the move construction. With the std::move a new object must be constructed.