HP Fortran Programmer's Guide (March 2010)

Migrating to HP Fortran
Migration issues
Chapter 10240
If you find object-code incompatibilities, you should change the source code and recompile
with the f90 command.
Data file issues
In general, data files are the easiest files to migrate because the data files produced by the
two Fortrans are compatible. However, problems can occur because of misaligned data and
data types that are not supported under HP Fortran. For example, HP FORTRAN 77 permits
misaligned data, especially when working with the structure extension. Also,
HP FORTRAN 77 accepts nonstandard representations of logicals. Both examples can result
in data files that are incompatible with HP Fortran.
To resolve problems with incompatible data files, examine the source file of the program that
generated the data file as well as the command line that was used to compile the source file,
following the suggestions discussed in “Object code issues” on page 239.