[Bug c++/65509] [C++11] GCC rejects operator== with two distinct pointers as not constexpr

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65509

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started I think with r218462.