https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89660
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Untested patch:
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -9433,10 +9433,12 @@ maybe_warn_pessimizing_move (tree retval, tree
functype)
}
/* Warn if the move is redundant. It is redundant when we would
do maybe-rvalue overload resolution even without std::move. */
- else if (treat_lvalue_as_rvalue_p (arg, /*parm_ok*/true))
+ else if (warn_redundant_move
+ && treat_lvalue_as_rvalue_p (arg, /*parm_ok*/true))
{
/* Make sure that the overload resolution would actually succeed
if we removed the std::move call. */
+ cp_unevaluated e;
tree t = convert_for_initialization (NULL_TREE, functype,
move (arg),
(LOOKUP_NORMAL
