> On Nov 29, 2016, at 8:48 AM, Ryan Lovelett via swift-dev <swift-dev at swift.org> wrote: > > Is it known/expected that Swift will not build with Clang 3.9.0? Yes. LLVM and Clang's interfaces are not stable. You must build Swift against the 'stable' branch of the 'swift-llvm' and 'swift-clang' forks. -Joe