求经验人士科普一下。
当编译静态库，设备选模拟器 (iPhoneSimulator)，未设置任何 Build Settings 参数时，默认的基础路径：
/Users/xxx/Library/Developer/Xcode/DerivedData/xxxWorkspace-caepeadwrerdcrftijaolkkagbjf
其中 caepeadwrerdcrftijaolkkagbjf 这个目录命名实际上是怎么生成的？有什么因素会影响到它生成不一样的字符串？
A unique subfolder inside the derived data folder. The subfolder name is based on your project or workspace name and location. This is the recommended choice and the default setting.
https://developer.apple.com/library/ios/recipes/xcode_help-locations_preferences/Build/Build.html
#1 楼 @lihuazhang 三克油