Some mac libraries published in the Xcode SDK are now arm64e only, and catalyst applications should be able to link against these even if building for arm64. This matches ld-prime behavior. https://reviews.llvm.org/D124336 allows linking against MacOS libraries, but only if the architecture matches exactly. https://reviews.llvm.org/D130683 allows linking against tbds with ABI compatibility architectures, but the logic isn't used for this particular case. [Assisted-by](https://t.ly/Dkjjk): [Claude Opus 4.6](https://www.anthropic.com/news/claude-opus-4-6) --------- Co-authored-by: Nuri Amari <nuriamari@fb.com>