jroelofs added inline comments.
================
Comment at: include/clang/Basic/Builtins.def:480
BUILTIN(__builtin_thread_pointer, "v*", "nc")
+BUILTIN(__builtin_launder, "v*v*", "nt")
----------------
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`.
https://reviews.llvm.org/D40218
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