Undefined symbols for architecture armv7的处理

问题描述：

1. 使用iphone6p真机调试，编译正常
2. 换成iPhone5真机调试，编译出现一堆错误：

   ld: warning: ld: warning: ignoring file /Users/lynn/Library/Developer/Xcode/DerivedData/Homecare-bcfxxolnwbuzthdgksefvehktwzf/Build/Products/Debug-iphoneos/libAFNetworking.a, file was built for archive which is not the architecture being linked (armv7): /Users/lynn/Library/Developer/Xcode/DerivedData/Homecare-bcfxxolnwbuzthdgksefvehktwzf/Build/Products/Debug-iphoneos/libAFNetworking.aignoring file /Users/lynn/Library/Developer/Xcode/DerivedData/Homecare-bcfxxolnwbuzthdgksefvehktwzf/Build/Products/Debug-iphoneos/libCocoaAsyncSocket.a, file was built for archive which is not the architecture being linked (armv7): /Users/lynn/Library/Developer/Xcode/DerivedData/Homecare-bcfxxolnwbuzthdgksefvehktwzf/Build/Products/Debug-iphoneos/libCocoaAsyncSocket.a
   ......
   Undefined symbols for architecture armv7:
     "_OBJC_CLASS_$_JTHorizontalCalendarView", referenced from:
         type metadata accessor for __ObjC.JTHorizontalCalendarView in CalendarViewController.o
     "_OBJC_CLASS_$_JTCalendarDayView", referenced from:
         ZTE.CalendarViewController.calendar (__ObjC.JTCalendarManager!, prepareDayView : __ObjC.UIView!) -> () in CalendarViewController.o
         ZTE.CalendarViewController.calendar (__ObjC.JTCalendarManager!, didTouchDayView : __ObjC.UIView!) -> () in CalendarViewController.o
     "_OBJC_CLASS_$_MGSwipeTableCell", referenced from:
         _OBJC_CLASS_$__TtC3ZTE15MessageItemView in MessageItemView.o
     "_OBJC_CLASS_$_QNZone", referenced from:
         type metadata accessor for __ObjC.QNZone in HCUploadManager.o
     "_OBJC_CLASS_$_QNConfiguration", referenced from:
         type metadata accessor for __ObjC.QNConfiguration in HCUploadManager.o
     "_OBJC_CLASS_$_MJRefreshHeader", referenced from:
         _OBJC_CLASS_$_HCRefresh in HCRefresh.o
     "_OBJC_METACLASS_$_MJRefreshHeader", referenced from:
         _OBJC_METACLASS_$_HCRefresh in HCRefresh.o
     "_OBJC_CLASS_$_AFNetworkReachabilityManager", referenced from:
     ......

问题分析：
从日志上看，出问题的都是实用cocoapods安装的第三方库；从日志看，应该是没有编译armv7对应的内容，修改pods工程的配置：
buildsettings->build active architecture only属性，debug－>NO, release->NO

我这样改后，还是报同样的错误；折腾了好久，最后进入pods编译出的静态库存在的目录，把所有第三方静态库全删了，重编一下就好了。