HP SunSoft Pascal 4.0 Language Preprocessor

3

Figure 3-1 shows the sequence of events when you invoke pc.

Compiler

pc

Symbol con- flict checking

pc3

	Compiler		Compiler		Code		Link	Executable
Source and
	preprocessor		frontend		generator		editor
include files								a.out
	cpp or cppas		pc0			cg	ld
		Optimize with		Optimizer
		-O[level]option
				iropt
							Libraries

Figure 3-1Organization of Pascal Compilation

Language Preprocessor

The cpp(1) program is the C language preprocessor. The compiler driver pc normally calls cpp(1) during the first pass of a Pascal compilation. If you use the –xlswitch, pc calls the alternate preprocessor cppas. Then cpp(1) and cppas operate on files that contain the extension .p or .pas.

You can give directives to cpp(1) or cppas to define constants, conditionally compile parts of your program, include external files, and take other actions. For example, the following program shows the use of an include directive, which asks cpp(1) to copy the named file into the program before compilation.

The Pascal Compiler 19