问题：
What does .PHONY mean in a Makefile? .PHONY在Makefile中是什么意思？ I have gone through this , but it is too complicated. 我已经经历过了 ，但是它太复杂了。
Can somebody explain it to me in simple terms? 有人可以简单地向我解释吗？
解决方案：
参考一： https://stackoom.com/question/90AI/Makefile中-PHONY的作用是什么
参考二： https://oldbug.net/q/90AI/What-is-the-purpose-of-PHONY-in-a-makefile
