转自：http://becomingindiedev.blogspot.com.es/2014/12/cocos2d-x-v3x-and-xcode-6x-with-arm-64.html
Hi!
When I upgraded to Xcode 6, I noticed that there were lots of linking problems in Cocos2d-x projects that used to work fine with previous versions of Xcode. The problems are related to the ARM 64 architecture. After searching a while, I found hints to the solution, although I was missing a more step-by-step solution. So here it is how I solved it.
1) Add linker flags for ARM 64 architecture. In your target, select Build Settings > Linking > Other Linker Flags and set the following flags for Debug and Release for arm64 architecture:
-ljpeg_arm64
-lcurl_arm64
-lpng_arm64
-ltiff_arm64
-lwebp_arm64
-lwebsockets_arm64
-lfreetype_arm64
EDIT: this is no longer required from Cocos2d-x v3.4.
2) Add library paths. In your target, select Build Settings > Search Paths > Library Search Paths, and write the following directory for Debug and Release.
YourProjectPath/cocos2d/external
And don't forget to set "recursive".
Hope it's useful. See you!
FM