(make.info)Empty Commands

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Using Empty Commands

   It is sometimes useful to define commands which do nothing.  This is
done simply by giving a command that consists of nothing but
whitespace.  For example:

     target: ;

defines an empty command string for `target'.  You could also use a
line beginning with a tab character to define an empty command string,
but this would be confusing because such a line looks empty.

   You may be wondering why you would want to define a command string
that does nothing.  The only reason this is useful is to prevent a
target from getting implicit commands (from implicit rules or the
`.DEFAULT' special target; Note: Implicit Rules. and Note: Defining
Last-Resort Default Rules.).

   You may be inclined to define empty command strings for targets that
are not actual files, but only exist so that their dependencies can be
remade.  However, this is not the best way to do that, because the
dependencies may not be remade properly if the target file actually
does exist.  Note: Phony Targets, for a better way to do

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