(make.info.gz) Rule Example

 
 4.1 Rule Example
 ================
 
 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 `foo.c' and
 `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    * How to decide whether `foo.o' is out of date: it is out of date if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 `foo.c' or `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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