[Bug libstdc++/78991] std::sort and std::unique can not use std::function with clang++ -std=c++14

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78991

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |5.5

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've added a workaround to the libstdc++ code, which will be included in the
gcc 5.5, 6.4 and 7.1 releases.

You'll need the updated libstdc++ headers to be able to compile this code with
clang, e.g. by requesting the Ubuntu GCC maintainers to include this patch in
their gcc builds.