Index: cmake/modules/SingleMultiSource.cmake
===================================================================
--- cmake/modules/SingleMultiSource.cmake
+++ cmake/modules/SingleMultiSource.cmake
@@ -34,16 +34,9 @@
   get_filename_component(name ${path} NAME )
   set(name "${TARGET_PREFIX}${name}")
 
-  list(FIND registered_executables ${name} name_idx)
+  set(${new_name} ${name} PARENT_SCOPE)
+  set_property(GLOBAL APPEND PROPERTY registered_executables ${name})
 
-  if(${name_idx} EQUAL -1)
-    set(${new_name} ${name} PARENT_SCOPE)
-    set_property(GLOBAL APPEND PROPERTY registered_executables ${name})
-    return()
-  endif()
-
-  message(FATAL_ERROR "Duplicate executable name!"
-    "Please set unique prefix with llvm_target_prefix().")
 endfunction()
 
 # Add flags to a cmake target property.