[Bug c++/49568] New: [4.7 regression] g++.dg/torture/pr41257-2.C FAILs to link on Tru64 UNIX

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49568

           Summary: [4.7 regression] g++.dg/torture/pr41257-2.C FAILs to
                    link on Tru64 UNIX
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: link-failure
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ro@gcc.gnu.org
              Host: alpha-dec-osf5.1b
            Target: alpha-dec-osf5.1b
             Build: alpha-dec-osf5.1b


Between 20110502 and 20110518, g++.dg/torture/pr41257-2.C started to FAIL
on Tru64 UNIX:

A::~A()
typeinfo for A
collect2: error: ld returned 1 exit status

which is a link error (undefined symbols).  This is a regression from the 4.6
branch.  While the input file is identical, the generated code is far longer on
mainline, and contains a call to an undefined function _ZN1AD2Ev (A::~A()).

This may be related to the fact that Tru64 UNIX doesn't support weak
definitions,
but the code is plain wrong.

I'm attaching assembler output from 4.6 and 4.7.