Adding a dependency to compileReleaseSources or compileDebugSources

Simply adding a dependency to compileReleaseSources causes a gradle error.

compileReleaseSources.dependsOn 'someTask'

Could not get unknown property 'compileReleaseSources' for project 

The dependency need to be added in whenTaskAdded closure:

tasks.whenTaskAdded { t ->
    if (t.name in ['compileReleaseSources', 'compileDebugSources']) {
        t.shouldRunAfter 'someTask'
        t.dependsOn 'someTask'
    }
}

Note that you need both t. shouldRunAfter (or t.mustRunAfter) and t.dependsOn.