On Nov 24, 2013, at 2:21 PM, Guy Harris <guy@xxxxxxxxxxxx> wrote:
> However, the Sun^WOracle C compiler might also accept some of those flags, and it might generate code that causes a SIGABRT on SPARC:
That might be -ftrapv, which appears to me to be mutually-exclusive with -fwrapv; -ftrapv says "trap on signed integer overflow" and -fwrapv means "wrap around on signed integer overflow", and I don't think you can do both, other than "trap and, if somebody returns from the trap handler, wrap around".
I suspect most code we're using expects wraparound, either explicitly or implicitly.
I don't think the MIT CSAIL paper was saying "use all the GCC flags we mentioned", especially given that using both -ftrapv and -fwrapv doesn't seem to make sense.
I've removed -ftrapv; we'll see what that does.
