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Recall that the executable file, analyze_train, described
in Chapter 45, depends on three object files. This
dependency is reflected in a makefile line in which
analyze_train appears, followed by a colon, followed by a
list of the depended-on files:
analyze_train: trains.o containers.o cars.o
A similar line asserts that the trains.o file
depends on the trains.cxx file and two
included header files:
trains.o: trains.cxx containers.h cars.h
Finally, the following lines assert that the object files containing member functions depend on both source code files and header files:
containers.o: containers.cxx containers.h cars.o: cars.cxx cars.h containers.h
Note that dependency lines must begin in the first column—no spaces or tabs are permitted.