Undefined symbols for architecture i386: "_crc32", referenced from:

IOS编译时有时出现这样的错误,要注意,错误不在Undefined for architecture i386,而是下面下划线开头的变量没定义,此时需要导入libz到项目即可。

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文章来自:http://www.cnblogs.com/dzut/p/4265017.html
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