[peppermint_gum]

Swift's LLVM fork is open-source, just not upstreamed. No Free Software license requires forks to upstream their changes.

https://github.com/swiftlang/llvm-project

[Zambyte]

Referring to their fork as "private" seems quite misleading then.

[pjmlp]

Yet you're complaining that they are using the licence exactly as they feel like.

[nequo]

Parent was not complaining. Parent was asking what the rationale is behind maintaining a separate LLVM fork instead of upstreaming and reducing the maintenance burden on Apple engineers.