Makefile is not Make love.(http://blog.csdn.net/fudan_abc/archive/2007/06/19/1657883.aspx)
We usually make a positive definition like: What is something.
But now we use negative definition because of.....
However, Makefile is so important for Linux!
Abridged:
有几个地方值得解释一下的。首先,我在定义大部分变量的时候使 用的是 := 而不是 = 符号。它的作用是立即把定义中参考到的函 数和变量都展开了。如果使用 = 的话,函数和变量参考会留在那 儿,就是说改变一个变量的值会导致其它变量的值也被改变。例 如:
A = foo
B = $(A)
# 现在 B 是 $(A) ,而 $(A) 是 'foo' 。
A = bar
# 现在 B 仍然是 $(A) ,但它的值已随着变成 'bar' 了。
B := $(A)
# 现在 B 的值是 'bar' 。
A = foo
# B 的值仍然是 'bar' 。
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