On Thu, Aug 11, 2011 at 10:36 PM, Joe Buck <joe.b...@synopsys.com> wrote: > 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.
Of course, I think that is what is being proposed. Richard.
