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[Bug libstdc++/33896] New: std::tr1::array has too-conservative alignment on _M_instance


std::tr1::array's only data member, _M_instance, has
__attribute__((__aligned__)) which means that it potentially takes more space
in memory than is required by the size and alignment of type _Tp.  This makes
tr1::array somewhat less attractive than C-style arrays, especially on
low-memory systems, since there's an unnecessary hidden cost.

Paolo mentioned that this was originally done to play it safe with some
extensions, but that those extensions could be fixed.  I don't know which
extensions he was referring to.


-- 
           Summary: std::tr1::array has too-conservative alignment on
                    _M_instance
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: atgraham at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33896


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