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Please implement http://gcc.gnu.org/ml/gcc-patches/2006-06/msg01047.html
This is useful because previously, gcc-4.0.1 didn't warn about this case:
void f(void *last, ...) __attribute__((sentinel(0,1)));
but gcc-4.2 does. We have APIs that make use of the null being in the first argument and they used the sentinel check, but now clients get lots of warnings due to the `new' behavior.
We've added this to our compiler, just 49 lines...
And why don't you submit it????
If you have added it to (*cough*) "your compiler", why don't you just submit it?
Oh wait. Apple. Right...