[Bug fortran/31447] New: set intent(out) arguments to uninitialized

["vivekrao4 at yahoo dot com" <gcc-bugzilla at gcc dot gnu dot org>]

It would be nice if gfortran had an option to set intent(out) arguments to NaN
or some random values, so that code mistakenly relying on intent(out) arguments
starting with the same value as in the caller would be detected. This is
related to the question of detecting on uninitialized variables.

For example, the code

subroutine unset(i)
integer, intent(out) :: i
i = i*2
end subroutine unset

program xunset
integer :: i
i = 1
call unset(i)
print*,"i=",i
end program xunset

gives "i = 2" but the standard does not require that it do so, since argument i
has intent(out).

Vivek Rao


-- 
           Summary: set intent(out) arguments to uninitialized
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vivekrao4 at yahoo dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31447