EricWF added inline comments.
================
Comment at: include/clang/Basic/Builtins.def:480
BUILTIN(__builtin_thread_pointer, "v*", "nc")
+BUILTIN(__builtin_launder, "v*v*", "nt")
----------------
jroelofs wrote:
> GCC's is type-generic:
>
> ```
> #include <type_traits>
>
> bool is_type_generic() {
> int v;
> return std::is_same<decltype(__builtin_launder(&v)),
> decltype(&v)>::value;
> }
> ```
>
> However this `BUILTIN` line says that this one is not (yeah, I see it's being
> fixed up in Sema later in this patch). I think you need to use custom type
> checking here via `t`.
The `t` is specified. It's in the third argument.
https://reviews.llvm.org/D40218
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