极光推送添加必要库 报错JPUSHSRVResolver processRecord:length:

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Undefined symbols for architecture x86_64:
  "_dns_free_resource_record", referenced from:
      -[JPUSHSRVResolver processRecord:length:] in jcore-ios-1.0.0.a(JPUSHSRVResolver.o)
  "_dns_parse_resource_record", referenced from:
      -[JPUSHSRVResolver processRecord:length:] in jcore-ios-1.0.0.a(JPUSHSRVResolver.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

公司需要搞推送，用原生的嫌麻烦，就用了极光推送，在添加完必要的库后，编译报错，以上，解决办法添加这个库 libresolv，搞定