我用高德地图的sample都没有问题，然后新建一个工程，出现了以下错误，希望大家帮我看看是什么问题。谢谢。
Undefined symbols for architecture i386:
"std::string::find_first_of(char const*, unsigned long, unsigned long) const", referenced from:
google::protobuf::SplitStringUsing(std::string const&, char const*, std::vector<std::string, std::allocator<std::string> >*) in libMASearchKit.a(strutil.o)
"std::string::find_first_not_of(char const*, unsigned long, unsigned long) const", referenced from:
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------解决方案--------------------
http://blog.csdn.net/ashqal/article/details/8995874