今天在写iOS项目时，需要用到微信登陆模块，所以引入了微信官方的iOS SDK，但是编译时一直出Mach-O的错误，怀疑是SDK本身的问题。于是建了个新的空项目，导入WeChatSDK，依旧报错，报错内容一致：

Undefined symbols for architecture x86_64:
“operator delete[](void*)”, referenced from:
+[WeChatApiUtil EncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil NsDataEncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeWithBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
“operator new[](unsigned long)”, referenced from:
+[WeChatApiUtil EncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil NsDataEncodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeWithBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
+[WeChatApiUtil DecodeBase64:] in libWeChatSDK.a(WeChatApiUtil.o)
“___gxx_personality_v0”, referenced from:
Dwarf Exception Unwind Info (__eh_frame) in AppDelegate.o
Dwarf Exception Unwind Info (__eh_frame) in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

经研究，加入libc++.dylib可解决问题。

具体方法是：打开工程的属性窗口，在Build Phases的Link Binary With Libraries里面添加libc++.dylib

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