HP Pascal/HP-UX Release Notes Version A.10.08

Chapter 1 43

New and Changed Features

Porting HP Pascal/HP-UX Programs

If you plan to run your programs only on HP computers, the effort to port

your programs between HP computers is minimal and the extra features

that HP Pascal/HP-UX provides will make your programming much

easier. However, if you plan to port your programs to another vendor's

computer, the effort to do so will be proportional to your use of

nonstandard HP Pascal/HP-UX extensions. Even if the system you are

porting to has extensions, it is doubtful that the extensions on that

system have the same form as extensions on HP Pascal/HP-UX.

To determine which features are nonstandard in an HP Pascal/HP-UX

source ﬁle, include the $ANSI ON$ compiler option at the start of your

source ﬁle or use the -A command-line option.

When you compile the source ﬁle using the -L command-line option, the

compiler generates a listing ﬁle that shows where nonstandard features

are used. Combined, the ANSI compiler option and the -L command-line

option assure you that you are using only ANSI Standard Pascal features

or that you are aware of where you are using nonstandard features.

Porting Between Series 300/400 and Series

700/800

This section summarizes some of the HP Pascal/HP-UX language

features, both standard and nonstandard, that may cause problems

when porting Pascal programs between Series 300/400 and Series

700/800 as well as to or from other systems.

Data Type Sizes and Alignments

Table 1-6 shows the sizes and alignments of the Pascal data types on

HP-UX architectures. Packing signiﬁcantly affects data type alignments

and sizes. For more speciﬁc information, refer to HP Pascal/HP-UX

Reference Manual; and HP Pascal/HP-UX Programmer's Guide.

On the Series 300/400, if the +A command-line option is speciﬁed, any

data types larger than two bytes are aligned on a 2-byte boundary.