; RUN: rm -rf %t
; RUN: mkdir -p %t
; RUN: not llvm-readtapi -stubify %t/objc.dylib %t/flat_namespace.dylib %t/thread_local.dylib %t/fat.dylib --o %t/tmp.tbd 2>&1 | FileCheck %s --allow-empty --check-prefix OUT
; RUN: not llvm-readtapi -stubify --o %t/tmp.tbd 2>&1 | FileCheck %s --allow-empty --check-prefix IN

; OUT: error: cannot write multiple inputs into single output file
; IN: error: stubify requires at least one input file