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POLinker error when compiling iOS 5 app for Simulator - Undefined symbols: _objc_assign_global, _objc_assign_ivar, and _objc_assign_strongCast
 

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  1. POLinker error when compiling iOS 5 app for Simulator - Undefined symbols: _objc_assign_global, _objc_assign_ivar, and _objc_assign_strongCast
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    <p>My project no longer compiles for the iOS 5.0 Simulator after upgrading to automatic ref counting. It still compiles flawlessly for any iOS device.</p> <p>Also, after upgrading to iOS 5, but before upgrading to automatic ref counting, my project would compile flawlessly for both device and simulator.</p> <p>The linker says it can't find the following symbols:</p> <ul> <li> _objc_assign_global</li> <li> _objc_assign_ivar</li> <li> _objc_assign_strongCast</li> </ul> <p>I thought at first I might be missing a Simulator specific framework, but after adding every available framework I still get the same errors.</p> <h3>Other Info</h3> <ul> <li>iOS deployment target is: 4.0.</li> <li>OS is Snow Leopard OSX 10.6.8 64bit</li> </ul> <pre> Undefined symbols for architecture i386: "_objc_assign_global", referenced from: +[InAppPurchaseManager sharedInAppPurchaseManager] in InAppPurchaseManager.o +[ThemeManager sharedThemeManager] in ThemeManager.o +[DownloadUpdatesManager sharedDownloadUpdatesManager] in DownloadUpdatesManager.o +[AudioManager sharedAudioManager] in AudioManager.o +[IOHelper sharedIOHelper] in IOHelper.o -[CKBezierPath svgStringPath] in CKBezierPath.o +[PreferencesManager defaultLineWidth] in PreferencesManager.o ... "_objc_assign_ivar", referenced from: -[InAppPurchaseManager init] in InAppPurchaseManager.o -[InAppPurchaseManager addTransactionObserver:] in InAppPurchaseManager.o -[InAppPurchaseManager removePurchaseTransactionObserver:] in InAppPurchaseManager.o -[InAppPurchaseManager purchaseProduct:forThemeIDType:] in InAppPurchaseManager.o -[InAppPurchaseManager productsRequest:didReceiveResponse:] in InAppPurchaseManager.o -[ThemeEditVC viewDidLoad] in ThemeEditVC.o -[ThemeEditVC setDelegate:] in ThemeEditVC.o ... "_objc_assign_strongCast", referenced from: +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o __replacePlaceholdersWithValues in Utility.o -[LocationManager checkForNewLocation:] in LocationManager.o -[LocationManager getNewLocationInStringFormat] in LocationManager.o ___52-[LocationManager getNewLocationInStringFormat]_block_invoke_0 in LocationManager.o ... ld: symbol(s) not found for architecture i386</pre> <h3>Edit:</h3> <p>Objective-C Garbage Collection was set to "Supported" rather than "Required". After setting it to "Required", I got the error:</p> <p>ld: /Users/teacher/drawingapp/FlurryLib/libFlurryAnalytics.a(FlurryAnalytics.o) built with incompatible Garbage Collection settings to link with previous .o files for architecture i386 Command /Developer_4_2_ios5/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang failed with exit code 1</p> <p>After removing the Flurry library, the the previous error messages started appearing again.</p> <h3>Edit 2:</h3> <p>Well it looks like Garbage Collection is only supported for OS X and not for iOS. I still don't understand why it would allow me to compile and run the app on the device with Garbage Collection turned on, yet not on the simulator.</p> <p>Anyway I've just set Garbage Collection to "Unsupported" but now it will no longer compile and run on the device.</p> <p>I'm now getting this error:</p> <pre> /Users/teacher/drawingapp/Main/Source/PurchaseThemeOptionVC.m 1. /Users/teacher/drawingapp/Main/Source/PurchaseThemeOptionVC.m:52:1: current parser token '-' 2. /Users/teacher/drawingapp/Main/Source/PurchaseThemeOptionVC.m:39:1: LLVM IR generation of declaration 'PurchaseThemeOptionVC::viewDidLoad' 3. /Users/teacher/drawingapp/Main/Source/PurchaseThemeOptionVC.m:39:21: LLVM IR generation of compound statement ('{}') clang: error: unable to execute command: Segmentation fault clang: error: clang frontend command failed due to signal 2 (use -v to see invocation) </pre>
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