How to add generatedBy to sourceset in plugin

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1

The following code doesn’t appear to do anything:

binary.tasks.findAll({it.name == "${taskName}"}).each { task ->
    binary.inputs.withType(CppSourceSet) { sourceset ->
        sourceset.generatedBy(task)
    }
}

How can I add generated sources to a sourceset such that the task is run before compilation?