[patch, fortran] PR 30146, errors for INTENT(OUT) and INTENT(INOUT) for DO loop variables

[Thomas Koenig]

Hi Tobias,

>
> Hi Thomas,
>
> there are already lots of places that check for do variables,
> gfc_check_do_variable() does the hard work.

gfc_check_do_uses gfc_state_stack, which is built up (and
destroyed) during parsing.  This is too early because we
need to have the formal arglists resolved before we can
do the checks.

> Couldn't the same result be
> achieved in a much simpler way during resolution?

We would have to do the same work, building up a stack
of DO loops, during resolution.  I don't think there is
an advantage in simplicity doing this in resolution;
we would also have to make sure that the subroutine calls
within the DO loops and the loop variables are  resolved before
doing the check on the INTENT.

Regards

	Thomas