Makefile中的:=和=有什么区别? [英] What's the difference between := and = in Makefile?
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问题描述
对于Make中的变量赋值，我看到:=和=运算符.它们之间有什么区别?
For variable assignment in Make, I see := and = operator. What's the difference between them?
推荐答案
This is described in the GNU Make documentation, in the section titled 6.2 The Two Flavors of Variables .
简而言之，用:= 定义的变量被扩展一次，但是用 = 定义的变量在每次使用时都被扩展.
In short, variables defined with := are expanded once, but variables defined with = are expanded whenever they are used.
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