My guess is that the attribute interacts weirdly with optimizations spanning function calls, like inlining. It might be safe for TUs that define a single functi

My guess is that the attribute interacts weirdly with optimizations spanning function calls, like inlining. It might be safe for TUs that define a single function, like with memmove above. Having said that applying the option to the TU itself would be equivalent, and not discouraged by GCC docs.