ld: -pie can only be used when targeting iOS 4.2 or later

ld: -pie can only be used when targeting iOS 4.2 or later

clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决方法：

把target设置高一点project->target->general->Deployment info-->Deployment Target

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原文地址：https://www.cnblogs.com/jasontec/p/9601604.html