jamieschmeiser added inline comments.
================
Comment at: clang/test/Sema/pointer-addition.c:34
+ f = (char*)(f - (char*)0); // expected-warning {{performing pointer
arithmetic on a null pointer has undefined behavior}}
+ f = (char*)((char*)0 - (char*)0); // expected-warning {{performing pointer
arithmetic on a null pointer has undefined behavior}} expected-warning
{{performing pointer arithmetic on a null pointer has undefined behavior}}
}
----------------
efriedma wrote:
> This is what I was afraid would happen.
>
> C++ has a specific carveout in the standard that "null-null" isn't undefined.
> C doesn't, but I'm not sure warning is practically useful there.
>
> In any case, printing the same warning twice isn't useful.
Yes, I see that [expr.add] p 7 says nullptr-nullptr is defined to be 0. I will
suppress the warning for this.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D98798/new/
https://reviews.llvm.org/D98798
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