接了个广告的sdk，tradplus广告，构建过程中发现pod install 一直失败，
找了好久好久，纠结了好几天，没用过ios打包。
报错信息如下：

-- Crash Report log information --------------------------------------------

   See Crash Report log file under the one of following:                    

     * ~/Library/Logs/DiagnosticReports                                     

     * /Library/Logs/DiagnosticReports                                      

   for more details.                                                        

Don't forget to include the above Crash Report log file in bug reports.     

解决方法：
原因可能是Ruby的FFI库是一个gem，用于以编程方式加载动态链接的本地库，在其中绑定函数，并从 Ruby 代码调用这些函数。（原文：Ruby-FFI is a gem for programmatically loading dynamically-linked native libraries, binding functions within them, and calling those functions from Ruby code.）

sudo arch -x86_64 gem install ffi
arch -x86_64 pod install