[Bug c++/85043] -Wuseless-cast false positive for temporary objects; add separate -Wcast-to-the-same-type to cover that case instead

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85043

--- Comment #18 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The casts that are still warned about should really be useless so I don't plan
to add another warning.