Next: Rule Syntax Up: Rules
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 dependencies 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* How to decide whether `foo.o' is out of date: it is out of date if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
* 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
automatically generated by info2www