[Bug fortran/35810] New: [F2003] Automatic reallocation on assignment to allocatable variables

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

The following is invalid Fortran 95 but valid Fortran 2003 as the variable is
reallocated:

integer, allocatable :: a(:)
allocate(a(1))
print *, size(a)
a = [1,2,3]  ! Implicit reallocation.
! Wrong: a(:) = [1,2,3] ! Out of bounds 1 vs. 3
print *, size(a)
end

The Intel compiler already supports this option. It provides the option -assume
[no]realloc_lhs to switch the support on/off. "Off" is useful for bound checks
and makes the program faster as the bounds do not need to be checked in that
case.

See also the comp.lang.fortran post at:
http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/7d5d1e7f4a48071c/7c63fef65ba5ea70?lnk=gst&q=realloc_lhs


-- 
           Summary: [F2003] Automatic reallocation on assignment to
                    allocatable variables
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org
OtherBugsDependingO 20585
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35810