g77

[Bud Davis]

g77 does not have a compiler option similar to -i8 -r8.

INTEGER*8 and DOUBLE PRECISION are implemented, however.

Here are some compiler options that may have some bearing on your problem:

(copied from info g77)

`-fno-automatic'
     Treat each program unit as if the `SAVE' statement was specified
     for every local variable and array referenced in it.  Does not
     affect common blocks.  (Some Fortran compilers provide this option
     under the name `-static'.)

`-finit-local-zero'
     Specify that variables and arrays that are local to a program unit
     (not in a common block and not passed as an argument) are to be
     initialized to binary zeros.

     Since there is a run-time penalty for initialization of variables
     that are not given the `SAVE' attribute, it might be a good idea
     to also use `-fno-automatic' with `-finit-local-zero'.



Lot's of time the "nan" problem is caused by un-initialized variables, 
and the two options above are done by default in some fortran compilers.


regards,
bud davis