Miscellaneous shortcuts

Although the examples we have shown do not explicitly say so, you can put more than one file in the target section of the dependency rules. If a file appears as a target more than once in a dependency, all of its source files are included as sources for that target.

Here is our sample Makefile again:

CFLAGS = -Aa -D_HPUX_SOURCE
OBJECTS = data.o main.o io.o
project1: $(OBJECTS)
        cc $(OBJECTS) -o project1
data.o main.o: data.h
io.o main.o: io.h

This Makefile shows main.o appearing in two places. Make knows by looking at all the dependencies that main.o depends on both data.h and io.h.

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