> On Jan 17, 2017, at 1:41 PM, Bob Wilson via swift-dev <swift-dev@swift.org> 
> wrote:
> 
> As I mentioned yesterday, once the last swift-3.1 merge is done, we are 
> planning to update the stable branches for Clang/LLVM to use the new 
> swift-4.0 branches that are aligned with LLVM 4.0. I was expecting we would 
> do that today, but we’re going to wait until tomorrow (Wednesday) morning 
> instead. That will give us time to get all the master-next bots passing and 
> should also be less disruptive than making the switch in the middle of the 
> day.

This is done now. You will need to rebuild Clang and LLVM.

I am also about to push a new swift-4.0-branch in the Swift repo. Please do not 
make changes there. All development for Swift 4 should continue on the master 
branch. The point of this new branch is to have a version of Swift that is 
aligned with Swift 3.1 but builds against the newer version of Clang/LLVM 
(i.e., the swift-4.0-branch version). As in the past, for the Swift repos we’ll 
rebranch swift-4.0-branch repeatedly over the course of Swift 4 development, 
but for the clang, llvm, and compiler-rt repos, we will only be cherry-picking 
individual commits to swift-4.0-branch.

If you need to make changes to Clang/LLVM for Swift, please make pull requests 
to get those changes into swift-4.0-branch. If the changes are appropriate for 
upstream Clang/LLVM, please get the changes there first; otherwise, they should 
first go to the upstream-with-swift branch on our GitHub repos.
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