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如何知道文件已更改(然后重新编译)?是否达到make?由编译器决定吗?如果是这样，它是否取决于语言?
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-如此简单.如果依赖关系比目标更新，则将重建目标.
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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