[Bug lto/51663] New: LTO does not reclaim comdat-local statics

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51663

             Bug #: 51663
           Summary: LTO does not reclaim comdat-local statics
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rguenth@gcc.gnu.org
                CC: hubicka@gcc.gnu.org


struct T;
struct C
{
    typedef ::T T;
    virtual void E();
    static T *m ()
      {
        static T *d;
        return d;
      }
};
int
fn ()
{
  C::m ();
}
int main() {}

The C++ frontend with -fwhole-program reclaims C::m::d, but LTO using
the linker plugin does not.  See PR51650 comment #15 and #16 for some
analysis.