On Thu, Aug 11, 2011 at 1:58 PM, Joseph S. Myers <jos...@codesourcery.com> wrote: > -ftrapv and -fwrapv should have no effect on pointer subtraction.
Gaby writes: > Yes! Wouldn't it suffice to convert the pointers to unsigned, do an unsigned subtraction, and then convert the result to signed? This would then guarantee that gcc uses two's complement semantics, independent of -ftrapv.
