Hello,

I recently asked about building a particular Swift release and couldn’t find 
the correct tag. It turns out there are two issues with this:

1. Somehow "git checkout swift-4.0.2-RELEASE” doesn’t work. In fact, the commit 
that tag references 
(https://github.com/apple/swift/commit/efb12f4d7a6aa7575333c13fbcdb7782426b130a 
<https://github.com/apple/swift/commit/efb12f4d7a6aa7575333c13fbcdb7782426b130a>)
 doesn’t seem to exist locally even after running “git fetch”, so I can’t even 
check out that commit’s parent and cherry-pick the release commit.

This is spooky enough to make me think I’m doing something wrong: can someone 
confirm or deny that this release tag really exists outside of GitHub?


2. The “stable” branch of llvm (which is automatically referenced when I run 
utils/update-checkout) isn’t compatible with that tag (its parent commit at 
least). Frustratingly, checking out "swift-4.0-branch” in both apple/swift and 
apple/swift-llvm does not build on linux either. This appears to be due to a 
rename/move of Dwarf.h somewhere along the line.

Any ideas?


Thanks,
Geordie

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