Makefile如何知道文件已更改（然后重新编译）？ [英] How does Makefile know that a file changed (and then recompile it)?
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问题描述
只是出于好奇，Makefile如何知道一个文件改变了（然后重新编译它）？是否 make ？是由编译器吗？如果是，是否依赖于语言？
Just out of curiosity, how does Makefile know that a file changed (and then recompile it)? Is it up to make? Is it up to the compiler? If so, is it language dependent?
推荐答案
它查看文件时间戳 - 如果依赖关系比目标更新，则重建目标。
It looks at the file time-stamp - simple as that. If a dependency is newer that the target, the target is rebuilt.
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