def _task_gen_factory(self, name, target, sources, env):
sources = self.to_nodes(sources)
task_gen = TaskGen(name, self.ctx, sources, target)
task_gen.env = _merge_env(self.env, env)
tasks = task_gen.process()
for t in tasks:
t.env = task_gen.env
self.ctx.tasks.extend(tasks)
outputs = tasks[0].outputs[:]
return outputs
