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When determining the install prefix in LLVMConfig.cmake etc resolve symlinks in CMAKE_CURRENT_LIST_FILE first. The motivation for this is to support symlinks like `/usr/lib64/cmake/llvm` to `/usr/lib64/llvm19/lib/cmake/llvm`. This only works correctly if the paths are relative to the resolved symlink. It's worth noting that this *mostly* already works out of the box, because cmake automatically does the symlink resolution when the library is found via CMAKE_PREFIX_PATH. It just doesn't happen when it's found via the default prefix path.