Re: g77

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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





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