引入微信支付Undefined symbols for arch

引入了微信官方的iOS SDK 后 出现下面的错误
Undefined symbols for architecture x86_64:
“operator delete”, 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)

在Build Phases的Link Binary With Libraries里面加入libc++.dylib可解决问题。