In my Xcode 5 project I use RestKit for REST communication. Everything works fine with the simulators, but generating the ipa file, I get the following error:
ld: warning: ignoring file /Users/joseph/Library/Developer/Xcode/DerivedData/XXXXXXXXXX-gdwdekevxtdfivfpsnmyykeqhulk/Build/Products/Debug-iphoneos/libRestKit.a, missing required architecture arm64 in file /Users/joseph/Library/Developer/Xcode/DerivedData/XXXXXXXXXXXXX-gdwdekevxtdfivfpsnmyykeqhulk/Build/Products/Debug-iphoneos/libRestKit.a (2 slices)
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_RKRelationshipMapping", referenced from:
objc-class-ref in classname-xxx.o
"_OBJC_CLASS_$_RKObjectMapping", referenced from:
objc-class-ref in classname-xxx.o
"_OBJC_CLASS_$_RKRequestDescriptor", referenced from:
objc-class-ref in classname-xxx.o
"_OBJC_CLASS_$_RKObjectManager", referenced from:
objc-class-ref in classname-xxx.o
"_OBJC_CLASS_$_RKResponseDescriptor", referenced from:
objc-class-ref in classname-xxx.o
"_RKStatusCodeIndexSetForClass", referenced from:
-[classname-xxx classname-Method] in classname-xxx.o
-[classname-xxx classname-Method] in classname-xxx.o
-[classname-xxx classname-Method] in classname-xxx.o
-[classname-xxx classname-Method] in classname-xxx.o
-[classname-xxx classname-Method] in classname-xxx.o
"_RKMIMETypeJSON", referenced from:
-[classname-xxxinitWithURLBase:timeOut:] in classname-xxx.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation).
If in RestKit project, I change in "Build Settings" -> "Architectures" the "Standard architectures (ARMv7, armv7s)" by Standard architectures (including 64-bit) (ARMv7, armv7s, arm64) option, everything compiles fine . Is this correct?, Does not bring any result, I have to change some other settings.
It just means you are building your project also for 64bit (iPhone 5s) and nothing to worry about, see this link for some more explanations: Xcode 5 and iOS 7: Architecture and Valid architectures