class FFI::Compiler::MultiFileTask

def self.scope_name(scope, task_name)
    task_name
end

def invoke_with_call_chain(task_args, invocation_chain)
  return unless needed?
  super
end

def needed?
    begin
        @application.options.build_all || out_of_date?(File.mtime(name))
    rescue Errno::ENOENT
        true
    end
end

def out_of_date?(timestamp)
    all_prerequisite_tasks.any? do |prereq|
        prereq_task = application[prereq, @scope]
        if prereq_task.instance_of?(Rake::FileTask)
            File.exist?(prereq_task.name) && prereq_task.timestamp > timestamp
        else
            prereq_task.needed?
        end
    end
end

def timestamp
    begin
        File.mtime(name)
    rescue Errno::ENOENT
        Rake::LATE
    end
end