如何理解这里出现的come

1)I am waiting for the day to come

2)For many migrants, this new life is far from a dream come true

麻烦老师解说一下上面出现的2个come, 不懂。

1) I am waiting for the day to come

for the day to come为不定式复合结构，作wait的目的状语。

2) For many migrants, this new life is far froma dream come true

a dream come true 中，come true为过去分词短语作dream的后置定语。