Adam Dickmeiss <adam@xxxxxxxxxxxx> writes: > The program below prints 1 or 0 depending on GCC version and > -O2/-fstrict-aliasing being present or not. With proper optimizations > enabled, 0 is printed. Otherwise, 1 is printed. > > So just to understand: strict aliases also take effect for > signed/unsigned char pointers? Aliasing does not apply to char pointers. That is, a pointer of type char* is permitted to alias any other pointer, and likewise for unsigned char* and signed char*. > static void decode_ptr(const unsigned char **src) But you aren't using a char* pointer, you are using a char** pointer. And aliasing certainly does apply to char** pointers. Ian
