I have a EXC_BAD_ACCESS when I call objc_setAssociatedObject with the linker flags : -weak_library /usr/lib/libSystem.B.dylib linker flags.
I absolutely need the linker flag because of this, do somebody know a workaround?
(I also have a crash on dispatch_async but I can work around that... Also, I'm building a iOS 4 only feature on my app that is iOS 3 compatible)
EDIT: With more research, I found this and this question but no more answer...
The problem is simply a bug in the iOS Simulator. The codes works fine on the device.
I've filled a radar on Apple's bug reporter (radar://9470793)
EDIT: Just found out : -weak_library /usr/lib/libSystem.B.dylib breaks the iOS Simulator. Use -weak-lSystem instead.
来源：https://stackoverflow.com/questions/5999238/exc-bad-access-on-objc-setassociatedobject-with-weak-library-usr-lib-libsystem