crash on iOS 4.x (arc problem)

[orenmeiri]

Project is not using ARC and base IOS 4.0

Added to project as described (including -fobj-arc for OpenUDID.m).
Runtime crash on iOS 4.3.3 on:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

dyld: Symbol not found: _objc_retainAutoreleasedReturnValue

[ylechelle]

Please take a look at the following:
http://stackoverflow.com/questions/7747783/is-arc-really-supported-in-ios-4-the-ios-4-2-sdk-is-missing-arc-related-symbols

Excerpt:
"ARC is supported on iOS 4.0 and above. You need to use the iOS 5.x SDK but can select iOS 4.3 for the Deployment Target. The one thing that is not supported in 4.x is automatic weak reference zeroing.
Oh, Xcode 4.2 is now out of NDA and can be used to submit apps."

[Gavtron]

Also refer to the other issue "Compile error in iOS 4.3", because there's a linker flag that needs to be added that I'm not sure if that stackoverflow thread mentions or not. Because without that linker flag, you get exactly the error you pasted above.

[sshahidaslamm]

Hi,

I am runing iOS 5 sdk. when i choose iPhone 5 simulator it works fine and when i choose iPhone 4.3 or 4.0 it crashes on

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

the stackoverflow link not worked for me, Here is the error log :

Current language: auto; currently objective-c
dyld: lazy symbol binding failed: Symbol not found: _objc_retainAutoreleasedReturnValue
Referenced from: /Users/mbpro/Library/Application Support/iPhone Simulator/4.3.2/Applications/36937277-9D1C-41C0-AD19-DA009B5C6A41/IBFS.app/IBFS
Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/System/Library/Frameworks/Foundation.framework/Foundation

dyld: Symbol not found: _objc_retainAutoreleasedReturnValue
Referenced from: /Users/mbpro/Library/Application Support/iPhone Simulator/4.3.2/Applications/36937277-9D1C-41C0-AD19-DA009B5C6A41/IBFS.app/IBFS
Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/System/Library/Frameworks/Foundation.framework/Foundation

(gdb)

[sshahidaslamm]

Solved by this and yes it should be added to the "tutorial" part that explains how to enable arc for the file.

#21

Thanks