[cfe-dev] Where is __builtin_launder?

[Stephan T. Lavavej via cfe-dev]

[STL]
> Am I doing something wrong, or is the builtin actually missing?

[John McCall]
> The patch implementing it literally hasn't been committed to Clang trunk yet.
> I'm not sure how you got the impression it was available for use.

Aha, thanks! I was confused because libc++ marked std::launder() as "Complete, 6.0" at https://libcxx.llvm.org/cxx1z_status.html .

STL