Yes, self-checksumming becomes impossible [1]. If you are concerned about anyone reversing your code (Apple or otherwise), you must obfuscate it. Either you wo

Yes, self-checksumming becomes impossible [1]. If you are concerned about anyone reversing your code (Apple or otherwise), you must obfuscate it. Either you work at the ARM level or the bitcode level (watchOS for now), but the basic techniques are the same. Or, you can avoid changing tools by doing source-level transformation. One of the companies probably impacted by this change is Arxan or other obfuscators. They have to change both front and backend to be LLVM -> LLVM. [1] Except for the case I mentioned before, where you predict the generated code for known architectures and use that to generate your constants. This still breaks if Apple generates code for a new architecture without your help.