When the mask is all false, F95 leaves it to the processor what
to return for maxloc, minloc etc.  F2003 specifies 0.  We currently
use 1, but changing this to 0 would make sense.

$ cat m.f90
program main
  real, dimension(2) :: a
  logical, dimension(2) :: fa
  fa = .false.
  print *,maxloc(a,fa)
end program main
$ gfortran m.f90
$ ./a.out
           1


-- 
           Summary: [Fortran 2003] maxloc for all-false mask
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libfortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tkoenig at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25378

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