Similarly, found a bug in clang around 2010 that would only happen with max optimization. Actually did manage to track down the root cause; an array access woul

Similarly, found a bug in clang around 2010 that would only happen with max optimization. Actually did manage to track down the root cause; an array access would fail if the index > 255. It went something like this: on ARM (this was building for iPhone) the LDA (Load Accumulator) instruction can store the memory offset (array index) within the instruction itself if it would fit within 1 byte, otherwise the offset would have to get loaded from a memory location pointed to by a given register. One of the two cases was faulty. Was just about to report this, but my Mac got upgraded to the next version of OS X, which magically solved the problem. What does the OS upgrade have to do with compiling? In the world of Macs, Xcode was also upgraded along with the OS, and in the newer version it was already fixed. Dangit!