diff --git a/llvm/runtimes/CMakeLists.txt b/llvm/runtimes/CMakeLists.txt
index 139f6034e13f..4d0747680a4d 100644
--- a/llvm/runtimes/CMakeLists.txt
+++ b/llvm/runtimes/CMakeLists.txt
@@ -90,25 +90,27 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
   endif()
 
   get_property(SUB_COMPONENTS GLOBAL PROPERTY SUB_COMPONENTS)
-  list(REMOVE_DUPLICATES SUB_COMPONENTS)
-  foreach(component ${SUB_COMPONENTS})
-    if(NOT TARGET ${component})
-      message(SEND_ERROR "Missing target for runtime component ${component}!")
-      continue()
-    endif()
-    if(LLVM_INCLUDE_TESTS AND NOT TARGET check-${component})
-      message(SEND_ERROR "Missing check target for runtime component ${component}!")
-      continue()
-    endif()
+  if(SUB_COMPONENTS)
+    list(REMOVE_DUPLICATES SUB_COMPONENTS)
+    foreach(component ${SUB_COMPONENTS})
+      if(NOT TARGET ${component})
+        message(SEND_ERROR "Missing target for runtime component ${component}!")
+        continue()
+      endif()
+      if(LLVM_INCLUDE_TESTS AND NOT TARGET check-${component})
+        message(SEND_ERROR "Missing check target for runtime component ${component}!")
+        continue()
+      endif()
 
-    if(TARGET install-${component})
-      list(APPEND SUB_INSTALL_TARGETS install-${component})
-    endif()
-  endforeach()
+      if(TARGET install-${component})
+        list(APPEND SUB_INSTALL_TARGETS install-${component})
+      endif()
+    endforeach()
 
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/Components.cmake.in
-    ${LLVM_BINARY_DIR}/runtimes/Components.cmake)
+    configure_file(
+      ${CMAKE_CURRENT_SOURCE_DIR}/Components.cmake.in
+      ${LLVM_BINARY_DIR}/runtimes/Components.cmake)
+  endif()
 
 else() # if this is included from LLVM's CMake
   include(${LLVM_BINARY_DIR}/runtimes/Components.cmake OPTIONAL)