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The following is a complete makefile for the analyze_train program;
note that the make utility interprets as comments lines beginning
with # characters:
# makefile for analyze_train program
analyze_train: trains.o containers.o cars.o
CC -o analyze_train trains.o containers.o cars.o
trains.o: trains.cxx containers.h cars.h
CC -c trains.cxx
containers.o: containers.cxx containers.h
CC -c containers.cxx
cars.o: cars.cxx cars.h containers.h
CC -c cars.cxx
The make utility is smart enough to propagate changes properly
through the dependencies. For example, noting a change to the
cars.cxx file, make produces a new cars.o
object-code file. Then, noting a change to the cars.o file,
make produces a new analyze_train executable file.