[Bug c++/55039] New: std::addressof vs. constexpr

["bkoz at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55039

             Bug #: 55039
           Summary: std::addressof vs. constexpr
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bkoz@gcc.gnu.org


If std::addressof can be made constexpr, then the iterator member functions of
std::array should be able to be made constexpr as well (begin/end, etc.)

As it stands, std::addressof calls into std::__addressof, which has a
reinterpret_cast, killing constexpr. 

If some variation of

http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html

could be extended to support this, then the new intrinsic could be used to
implement std::addressof.