Xcode7.2版本carthage包管理器兼容问题解决

      昨天尝试新的swift ios项目， 基于swift2.1， 运行时发现缺少一些swift开源库，项目是基于carthage构建的，于是使用carthage update 命令下载开源库，结果下载完运行Xcode发现报CPU架构方面的错误，错误如下:

/Users/Documents/iOS/iOS-/Carthage/Checkouts/Alamofire/Source/Alamofire.h:23:9: error: could not build module 'Foundation'
<unknown>:0: error: could not build Objective-C module 'Alamofire'
A shell task failed with exit code 65:
** BUILD FAILED **

The following build commands failed:
    CompileSwift normal arm64 /Users/Documents/iOS/iOS-/Carthage/Checkouts/Alamofire/Source/Upload.swift
    CompileSwift normal arm64 /Users/Documents/iOS/iOS-/Carthage/Checkouts/Alamofire/Source/ParameterEncoding.swift
    CompileSwift normal arm64 /Users/Documents/iOS/iOS-/Carthage/Checkouts/Alamofire/Source/Request.swift
    CompileSwift normal arm64 /Users/Documents/iOS/iOS-/Carthage/Checkouts/Alamofire/Source/ResponseSerialization.swift
    CompileSwiftSources normal arm64 com.apple.xcode.tools.swift.compiler
(5 failures)

分析了原因，发现是carthage版本的问题，于是开始升级cartage，直接通过brew update carthage竟然不行，查看了官网的文档后，通过下面的升级步骤解决了问题，swift坑还是不少啊。

 carthage verison
 0.8

 brew update
 brew remove carthage
 sudo rm -rf /Library/Frameworks/CarthageKit.framework
 brew install  carthage
 carthage verison
 0.11.0