https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87029

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Sun Aug 26 16:45:51 2018
New Revision: 263863

URL: https://gcc.gnu.org/viewcvs?rev=263863&root=gcc&view=rev
Log:
        PR c++/87029, Implement -Wredundant-move.
        * c.opt (Wredundant-move): New option.

        * typeck.c (treat_lvalue_as_rvalue_p): New function.
        (maybe_warn_pessimizing_move): Call convert_from_reference.
        Warn about redundant moves.

        * doc/invoke.texi: Document -Wredundant-move.

        * g++.dg/cpp0x/Wredundant-move1.C: New test.
        * g++.dg/cpp0x/Wredundant-move2.C: New test.
        * g++.dg/cpp0x/Wredundant-move3.C: New test.
        * g++.dg/cpp0x/Wredundant-move4.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/Wredundant-move1.C
    trunk/gcc/testsuite/g++.dg/cpp0x/Wredundant-move2.C
    trunk/gcc/testsuite/g++.dg/cpp0x/Wredundant-move3.C
    trunk/gcc/testsuite/g++.dg/cpp0x/Wredundant-move4.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c.opt
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog

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