make: Rules
4 Writing Rules
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A "rule" appears in the makefile and says when and how to remake certain
files, called the rule's "targets" (most often only one per rule). It
lists the other files that are the "prerequisites" of the target, and
the "recipe" to use to create or update the target.
The order of rules is not significant, except for determining the
"default goal": the target for 'make' to consider, if you do not
otherwise specify one. The default goal is the target of the first rule
in the first makefile. If the first rule has multiple targets, only the
first target is taken as the default. There are two exceptions: a
target starting with a period is not a default unless it contains one or
more slashes, '/', as well; and, a target that defines a pattern rule
has no effect on the default goal. (Defining and Redefining
Pattern Rules Pattern Rules.)
Therefore, we usually write the makefile so that the first rule is
the one for compiling the entire program or all the programs described
by the makefile (often with a target called 'all'). Arguments to
Specify the Goals Goals.
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