The following program is rightly rejected. But the problem is not really that
the ranks are different (as the example shows for "i", which is valid). The
issue is that "j" is a scalar. -- A user might also not be that familiar the
concept that a rank-0 array is equivalent to a scalar.
gfortran shows:
Error: Rank mismatch in argument 'i' at (1) (1 and 0)
other compiles have, e.g.
Error: Cannot pass scalar to array argument 'i' at (1)
Error: Scalar supplied for array argument I (no. 1) of SUB
Illegal association of a scalar actual argument with array dummy argument
"I".
error #7836: If the actual argument is scalar, the corresponding dummy
argument shall be scalar unless the actual argument is an element of an array
that is not an assumed-shape or pointer array, or a substring of such an
element. [I]
Though I'm not sure whether one needs to be as long as ifort.
Cool stuff: If one changes the "contains" into "end" and removes the last line,
gfortran -fwhole-file still detects the violated constraint, while ifort, g95,
openf95 miss it. NAG f95 also detects it.
implicit none
integer :: i(4,5),j
i = 0
call sub(i)
call sub(j) ! Wrong scalar passed to array
print '(5i0)', i
contains
subroutine sub(i)
integer :: i(*)
i(1) = 2
end subroutine sub
end
--
Summary: Misleading error message for passing a scalar to an
array
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40158
