[Bug libstdc++/85671] Lack of `std::move()` inside `operator/` for `std::filesystem::path`.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85671

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon May  7 17:26:28 2018
New Revision: 260009

URL: https://gcc.gnu.org/viewcvs?rev=260009&root=gcc&view=rev
Log:
PR libstdc++/85671 allow copy elision in path concatenation

By performing the /= operation on a named local variable instead of a
temporary the copy made for the return value can be elided.

        PR libstdc++/85671
        * include/bits/fs_path.h (operator/): Permit copy elision.
        * include/experimental/bits/fs_path.h (operator/): Likewise.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/fs_path.h
    trunk/libstdc++-v3/include/experimental/bits/fs_path.h