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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98701] I compiled a program with gfortran on Mac (Big
 Sur, version 11.1) and g77 on Windows 10.  I get two very different results
 for identical input files with the results from the one compiled by gfortran
 being wrong.
Date: Sun, 17 Jan 2021 00:08:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98701

--- Comment #12 from Steve Kargl <sgk at troutmask dot apl.washington.edu> =
---
On Sat, Jan 16, 2021 at 11:20:20PM +0000, Bahram.shahrooz at uc dot edu wro=
te:
>=20
> Do you've any suggestions for how to trace the source
> of error so I can fix the code?
>=20

Not really.  I suppose  old fashion debugging is needed
where you put 'print' statements into the code to check
intermediate results. As far as I can tell, you simply
are using undefined variables in the code.  This isn't
a gfortran bug, so the bug report will be closed.=