HP SunSoft Pascal 4.0 - Manual (Page 269)

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Pascal Preprocessor A
This appendix describes the preprocessors, cpp (1) and cppas .
cpp
cpp (1) is the C language preprocessor. Pascal runs your source program
through cpp (1) when you compile it without the –xl option. For a complete
description of cpp (1), see the Solaris documentation.
cppas
The cppas preprocessor handles the Pascal conditional variables and compiler
directives. You call cppas using the –xl option.
Conditional Variables
A conditional variable is defined when it appears in a %var directive;
otherwise, it is undefined. In addition, we predefine:
These variables are not predefined when you use -s0 , -s1 , -V0 , or -V1 .
__sun __SVR4 sparc
__sparc __SUNPRO_PC=0x400 unix
__unix sun