[Bug fortran/20938] New: Dependency checking fails for equivalences

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

program fc106

! Submitted by Walt Brainerd, The Fortran Company
! GNU Fortran 95 (GCC 4.1.0 20050322 (experimental))
! Windows XP

! Output is
!  1 2 3
!  1 1 1
!  1 1 1

! Output should be
!  1 2 3
!  1 1 2
!  1 2 3

real, dimension (3) :: a, b
equivalence (a(2), b)
a = (/ (i, i=1,3) /)
print *, a
b = a;
print *, a
print *, b
end program fc106

I think this means that we don't see that in the assignment b = a the RHS and
the LHS are dependent, and therefore don't copy via a temporary, but I haven't
checked.

-- 
           Summary: Dependency checking fails for equivalences
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tobi at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20938