Kenwood HP 9000 Example of Creating an Archive Library, Length.c Routine to Convert Length Units

Creating and Using Libraries

Creating Archive Libraries

cosh.o

Object modules are displayed.

erf.o

fabs.o

floor.o

. . . .

This indicates that the library was built from object files named cosh.o, erf.o, fabs.o, floor.o, and so forth. In other words, module names are the same as the names of the object files from which they were created.

Example of Creating an Archive Library

Suppose you are working on a program that does several conversions between English and Metric units. The routines that do the conversions are contained in three C-language files shown:

length.c - Routine to Convert Length Units

float	in_to_cm(float in)	/* convert inches to centimeters */
{
return (in * 2.54);
}
volume.c - Routine to Convert Volume Units
float	gal_to_l(float gal)	/* convert gallons to liters */
{
return (gal * 3.79);
}
mass.c - Routine to Convert Mass Units
float	oz_to_g(float oz)	/* convert ounces to grams */
{	return (oz * 28.35);
}

During development, each routine is stored in a separate file. To make the routines easily accessible to other programmers, they should be stored in an archive library. To do this, first compile the source files, either separately or together on the same command line:

$ cc -Aa -c length.c volume.c mass.c			Compile them together.
length.c:
volume.c:
mass.c:			List the .o files.
$ ls *.o
length.o	mass.o	volume.o

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