Index: cmake/modules/LLVMProcessSources.cmake
===================================================================
--- cmake/modules/LLVMProcessSources.cmake
+++ cmake/modules/LLVMProcessSources.cmake
@@ -41,7 +41,6 @@
 function(llvm_process_sources OUT_VAR)
   cmake_parse_arguments(ARG "" "" "ADDITIONAL_HEADERS" ${ARGN})
   set(sources ${ARG_UNPARSED_ARGUMENTS})
-  llvm_check_source_file_list( ${sources} )
   if( MSVC_IDE OR XCODE )
     # This adds .td and .h files to the Visual Studio solution:
     add_td_sources(sources)
@@ -52,20 +51,3 @@
 
   set( ${OUT_VAR} ${sources} PARENT_SCOPE )
 endfunction(llvm_process_sources)
-
-
-function(llvm_check_source_file_list)
-  set(listed ${ARGN})
-  file(GLOB globbed *.c *.cpp)
-  foreach(g ${globbed})
-    get_filename_component(fn ${g} NAME)
-    list(FIND LLVM_OPTIONAL_SOURCES ${fn} idx)
-    if( idx LESS 0 )
-      list(FIND listed ${fn} idx)
-      if( idx LESS 0 )
-        message(SEND_ERROR "Found unknown source file ${g}
-Please update ${CMAKE_CURRENT_LIST_FILE}\n")
-      endif()
-    endif()
-  endforeach()
-endfunction(llvm_check_source_file_list)