警告：在某些路径上创建 LLDB 目标时出错

Question

我正在 Xcode 6.1 和 iPhone (iOS 8.1) 模拟器上运行一个应用程序。在运行时，我在控制台窗口登录以下：

Warning: Error creating LLDB target at path '/Users/macbook/Library/Developer/Xcode/DerivedData/..Project.app'- 
using an empty LLDB target which can cause slow memory reads from remote devices.

如果我在 Xcode 5.x 和 iPhone (iOS 7.x) 模拟器中运行应用程序，那么控制台上就没有这样的日志。可能是什么原因？如果我将应用程序上传到应用程序商店会不会有问题。

Answer 1

This warning is primarily intended for iOS device debugging. In that environment, Xcode copies the device's libraries and frameworks up to the Mac and saves them in a directory for lldb. When you start the debug session and lldb sees that the Foundation framework is being used by your app, it can read the copy on the Mac -- otherwise it would have to read the copy out of memory from the iOS debug session which is slow.

Why you're seeing this with some of your simulator debug configurations, I can't say; it's not expected. But for a Mac native process debug session (like you're doing with iOS Simulator debugging), it is harmless - the performance cost of lldb reading it out of local mac memory is very small.

上传到商店时，它绝对不会对您的应用产生任何影响。这完全是 Xcode/lldb 缓存问题，与您的应用程序无关。