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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 in the recipe: ‘cc -c -g foo.c’. The recipe starts with a tab to identify it as a recipe.
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- How to decide whether ‘foo.o’ is out of date: it is out of date if it does not exist, or if either ‘foo.c’ or ‘defs.h’ is more recent than it.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 recipe 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.
This document was generated on October 10, 2013 using texi2html 5.0.