[Bug c++/58487] Missed return value optimization

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58487

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:2ae5384d457b9c67586de012816dfc71a6943164

commit r14-1594-g2ae5384d457b9c67586de012816dfc71a6943164
Author: Jason Merrill <ja...@redhat.com>
Date:   Tue Jun 6 12:46:26 2023 -0400

    c++: Add -Wnrvo

    While looking at PRs about cases where we don't perform the named return
    value optimization, it occurred to me that it might be useful to have a
    warning for that.

    This does not fix PR58487, but might be interesting to people watching it.

            PR c++/58487

    gcc/c-family/ChangeLog:

            * c.opt: Add -Wnrvo.

    gcc/ChangeLog:

            * doc/invoke.texi: Document it.

    gcc/cp/ChangeLog:

            * typeck.cc (want_nrvo_p): New.
            (check_return_expr): Handle -Wnrvo.

    gcc/testsuite/ChangeLog:

            * g++.dg/opt/nrv25.C: New test.