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I have an Xcode 4.3.2 iOS 5.1 project that compiles and runs fine when my build configuration uses a GCC_OPTIMIZATION_LEVEL of None [-O0], but fails with a EXC_BAD_ACCESS error when using any other optimization level. My project has GCC_VERSION set to Apple LLVM 3.1 (the default). Does this indicate a problem with my code?
Most often it indicates problem with your code. Like:
In rare cases it happens that such kind of crash turns out to be a compiler bug. But that is rare. More often that is problem with your code.
Try to pinpoint code that crashes and try to see how variables are used nearby that code. Check if everything is used/allocated/initialized/freed correctly there.