rsmith added a comment.

In https://reviews.llvm.org/D40144#927866, @hfinkel wrote:

> In https://reviews.llvm.org/D40144#927828, @tcanens wrote:
>
> > At least for GCC, it should use `__builtin_launder`.
>
>
> I presume we'll need to add something similar for Clang as well.


Yes, we agreed to use the same builtin name for this in Clang and GCC quite a 
while back, but haven't actually got around to implementing it in Clang yet. 
You should use `__has_builtin` to detect the existence of this builtin in 
Clang. In GCC, I believe this is available iff `__GNUC__` is 7 or greater.


https://reviews.llvm.org/D40144



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