Building with LLVM and any optimization causes app to crash on startup

Question

When I try to build my app with LLVM 2.0 in XCode 4.0.1 and any level or optimization that is not none (anything but -O0), the app crashes after i launch it on the device (s

Answer 1

Upgrade to Xcode 4.0.2.

It fixed this issue (crash on launch for ARMv6 but not ARMv7 with optimization turned on) for us.