iOS 4 app crashes at startup on iOS 3.1.3: Symbol not found: __NSConcreteStackBlock

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Ben Gottlieb pointed out yesterday that if you use blocks anywhere in your application, you’ll see a crash similar to this on a pre-4.0 OS while building with the LLVM compiler. To work around this, you can specify the linker flag -weak-lSystem in your Xcode build settings.

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