微信iOS SDK 1.5 出错 Undefined symbols for architecture xx

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今天测试最新的微信iOS SDK, 仅仅是建了一个空的工程，把sdk加进去运行，就报了以下错误:

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.old: symbol(s) not found for architecture x86_64clang: error: linker command failed with exit code 1 (use -v to see invocation)

开始是怀疑微信sdk不支持xx架构，于是lipo(方法见xCode6制作动态及静态Framework的最后部分)了一下，发现是支持的。以前使用其他第三方的sdk时，也遇到过类似的问题，果断加上libc++.dylib，问题解决。

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