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_dns_free_resource_r_dns_free环信SDK集成EaseMobSDK
"_dns_free_resource_record", referenced from: -[XMPPSRVResolver processRecord:length:] in libEaseMobClientSDKLite.a(XMPPSRVResolver.o)
这样的错误，是由于缺少库：
添加libresolv.dylib库，就可以了