diff --git a/llvm/cmake/modules/LLVMProcessSources.cmake b/llvm/cmake/modules/LLVMProcessSources.cmake
--- a/llvm/cmake/modules/LLVMProcessSources.cmake
+++ b/llvm/cmake/modules/LLVMProcessSources.cmake
@@ -59,9 +59,7 @@
 function(llvm_process_sources OUT_VAR)
   cmake_parse_arguments(ARG "PARTIAL_SOURCES_INTENDED" "" "ADDITIONAL_HEADERS;ADDITIONAL_HEADER_DIRS" ${ARGN})
   set(sources ${ARG_UNPARSED_ARGUMENTS})
-  if (NOT ARG_PARTIAL_SOURCES_INTENDED)
-    llvm_check_source_file_list(${sources})
-  endif()
+  llvm_check_source_file_list(${sources})
 
   # This adds .td and .h files to the Visual Studio solution:
   add_td_sources(sources)
@@ -90,6 +88,12 @@
     file(GLOB globbed *.c *.cpp)
   endif()
 
+  set_property(DIRECTORY APPEND PROPERTY LLVM_SOURCE_FILES ${listed})
+  if (ARG_PARTIAL_SOURCES_INTENDED) # llvm_process_source's scope
+    return()
+  endif()
+  get_directory_property(listed LLVM_SOURCE_FILES)
+
   foreach(g ${globbed})
     get_filename_component(fn ${g} NAME)
     if(ARG_SOURCE_DIR)