|GNU Make Manual||www.imodulo.com · 2003-04-05|
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Here is an example of a rule:
foo.o : foo.c defs.h # module for twiddling the frobs cc -c -g foo.c
Its target is
foo.o and its prerequisites are
defs.h. It has one command, which is
cc -c -g foo.c. The command line starts with a tab to identify it as a command.
This rule says two things:
How to decide whether
foo.o is out of date: it is out of date if it does not exist, or if either
defs.h is more recent than it.
How to update the file
foo.o: by running
cc as stated. The command does not explicitly mention
defs.h, but we presume that
foo.c includes it, and that that is why
defs.h was added to the prerequisites.
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