Frustrating iPhone Build Error

I've been fighting this for a few hours now and I'm getting fed up. My project builds fine with a debug simulator build , release simulator build and a debug device build, but for some reason it won't build with a release device build. I have a static library containing my cocos2d code, and another static library containing a game engine I wrote.

Because the game engine contains categories, I had to use the all_load linker flag to get it to run. Without this flag, the code builds fine. However, I get an unrecognized selector sent to instance exception when I try to run the game.

Here's the first build error:

ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)

Ld build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless normal armv6
cd /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -F/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -filelist /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless.LinkFileList -dead_strip -ObjC -all_load -miphoneos-version-min=4.0 /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libChipmunk.a /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a /Users/helixed/Dropbox/Documents/Development/iPhone/BlackHawk/build/Release-iphoneos/libBlackHawk.a -framework Foundation -framework UIKit -framework CoreGraphics -framework QuartzCore -framework OpenGLES -framework OpenAL -framework AVFoundation -framework AudioToolbox -lz -framework iAd -o /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless

ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1

And here's the second:

Ld build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless normal armv7
cd /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 -arch 开发者_开发知识库armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -F/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -filelist /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless.LinkFileList -dead_strip -ObjC -all_load -miphoneos-version-min=4.0 /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libChipmunk.a /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a /Users/helixed/Dropbox/Documents/Development/iPhone/BlackHawk/build/Release-iphoneos/libBlackHawk.a -framework Foundation -framework UIKit -framework CoreGraphics -framework QuartzCore -framework OpenGLES -framework OpenAL -framework AVFoundation -framework AudioToolbox -lz -framework iAd -o /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless

ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1

This is the only think keeping me from releasing, so I really appreciate the help.

Thanks.

I faced a similar problem, I had accidentally included (#import) the implementation file instead of the header file

When the compiler throws an error that 2 object files contain a duplicate symbol, check for how you have included (#import) the that duplicate symbol's class in the 2 implementation files.

I had this problem with adding both Facebook sdk and Dropbox sdk. The problem was both of the SDks are using having JSON lib so I removed one of them ans it works now.

Do you have it twice in your project structure? Check the left side of XCode and look through all the folders and make sure you don't have it in there multiple times.

Do you have a different set of device architectures (armv6, armv7, etc.) in your Release build than in your Debug build settings (either project, or target which overrides project settings)?

I think the solution to your problem lies in the unrecognized selector issue that you tried to solve using the -all_load flag. I use cocos2d-iphone in a static library and didn't need that flag. If you read up what it does, it should tell you that it's unlikely to be related to your problem:

What does the -all_load linker flag do?

It fixes linking to static libraries containing ONLY categories and NO classes. That certainly isn't true for cocos2d-iphone.

I recommend to figure out why you get unrecognized selector warnings without this flag. If necessary ask another question here.

You should also turn on the "Unrecognized Selector" build warning in the project's Build Settings, so that you get this warning while compiling as opposed to when it crashes while running the game (then it's too late and you wasted a lot of time). It's one of the settings I always turn on in an Xcode project.