[Bug libstdc++/87020] comparison operator isn't called for stateless allocator without is_always_equal for C++11/14

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87020

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The is_always_equal trait was invented in libstdc++ before it got into the
standard, and if we didn't give the same behaviour for C++11 and C++14 there
would be ODR violations. So this is not going to change.

The trait was added to resolve a defect report about missing 'noexcept' on
container member functions, so arguably it's needed to fix defects in C++11 and
C++14 anyway.