HP Fortran Programmer's Guide (March 2010)

Migrating to HP Fortran
Incompatibilities with HP FORTRAN 77
Chapter 10 229
Incompatibilities with HP FORTRAN 77
The following sections describe known incompatibilities between HP Fortran and
HP FORTRAN 77. These incompatibilities include both source-level and object-code
incompatibilities. A subset of these are detected by the HP fid tool, which is described in
“Fortran incompatibilities detector” on page 242.
Compiler limits
HP Fortran supports format field widths up to 32767. HP FORTRAN 77 allows format field
widths up to 2147483639, which is close to 2*31.
Command-line options not supported
The HP Fortran compiler does not accept the f77 command-line options listed in Table 10-1,
and the f77 options listed in Table 10-2 have been renamed for f90. In addition,
HP Fortran code may not link correctly with HP FORTRAN 77 object files that were compiled
with these options; see “Object code issues” on page 239.
Table 10-1 f77 options not supported by f90
+800 +e +N
+A +I[2|4] +R
+A3 +L8 +U
+A8 +LA -w66
+apollo -lisam
+E +mr
Table 10-2 f77 options replaced by f90 options
f77 option f90 replacement
-A
+langlvl
a
-a
+langlvl
a
+autodblpad
+autodbl
a