------- Comment #2 from burnus at gcc dot gnu dot org  2010-09-21 06:54 -------
(In reply to comment #1)
> Here is a case where we do have to evaluate at run time.  So maybe we can not
> do what is proposed above.

Well, I understood the request such that one passes a boolean for the 'YES' /
'NO' items. If it cannot be simplified at compile time, one adds (in trans*c)
code like:
   advance = _gfortran_compare_string (3, &"YES", len, &str) == 0;

Possibly, one should add a new function like
  advance = _gfortran_io_yes_no (len, &str, "ADVANCE");
which takes then also into account invalid values.



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