task unregistered {
    println "configuring unregistered"
    doLast {
        println 'unregistered'
    }
}

tasks.register("pb") {
    println "configuring pb"
    doLast {
        println 'preBuild'
    }
}
tasks.register("generateJni") {
    println "configuring generateJni"
    doLast {
        println 'jni'
    }
}
tasks.register("copyA") {
    dependsOn generateJni
    println "configuring copyA"
    doLast {
        println 'copyA'
    }
}
tasks.register("copyB") {
    dependsOn generateJni
    println "configuring copyB"
    doLast {
        println 'copyB'
    }
}
tasks.register("copyC") {
    dependsOn generateJni
    println "configuring copyC"
    doLast {
        println 'copyC'
    }
}

task copyAll {
    dependsOn copyA, copyB, copyC
}

pb.dependsOn copyAll