Special dependencies

Usually, make uses the same command to create or update a target, regardless of which file changes. Some other files, such as libraries allow users to replace a portion of its code. For this kind of different behavior, make allows a special form of the dependency, where the action specified can differ, depending on which file has changed. Here is an example for this rule:

target :: source1: command1
target :: source2: command2

As we have described, if source1 changes, target is created or updated using command1; command2 is used if source2 is modified instead.

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