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About 5 years ago we got a request to implement -Wself-move, which warns about useless moves like this: int x; x = std::move (x); This patch implements that warning. PR c++/81159 gcc/c-family/ChangeLog: * c.opt (Wself-move): New option. gcc/cp/ChangeLog: * typeck.cc (maybe_warn_self_move): New. (cp_build_modify_expr): Call maybe_warn_self_move. gcc/ChangeLog: * doc/invoke.texi: Document -Wself-move. gcc/testsuite/ChangeLog: * g++.dg/warn/Wself-move1.C: New test.
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