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On Apple platforms the builtins may be built for both arm64 and arm64e. With Makefile generators separate targets are built using Make sub-invocations. This causes a race when creating the symlink which may sometimes fail. Work around this by using a custom target that the builtin targets depend on. This causes any sub-invocations to depend on the symlinks having been created before. Mailing list thread: https://lists.llvm.org/pipermail/llvm-dev/2021-July/151822.html Reviewed By: thakis, steven_wu Differential Revision: https://reviews.llvm.org/D106305