diff --git a/llvm/runtimes/CMakeLists.txt b/llvm/runtimes/CMakeLists.txt
--- a/llvm/runtimes/CMakeLists.txt
+++ b/llvm/runtimes/CMakeLists.txt
@@ -220,13 +220,15 @@
   endforeach()
 
   if(LLVM_INCLUDE_TESTS)
-    include(${LLVM_BINARY_DIR}/runtimes/Tests.cmake OPTIONAL RESULT_VARIABLE have_tests)
-    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
-    if(have_tests)
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${RUNTIMES_LIT_TESTSUITES})
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${RUNTIMES_LIT_PARAMS})
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${RUNTIMES_LIT_EXTRA_ARGS})
+    if (NOT EXISTS ${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
+      # This file will be later replaced by the runtimes subbuild.
+      file(TOUCH ${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
     endif()
+    include(${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${RUNTIMES_LIT_TESTSUITES})
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${RUNTIMES_LIT_PARAMS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${RUNTIMES_LIT_EXTRA_ARGS})
     list(APPEND test_targets runtimes-test-depends check-runtimes)
   endif()
 
@@ -303,13 +305,15 @@
   endforeach()
 
   if(LLVM_INCLUDE_TESTS)
-    include(${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake OPTIONAL RESULT_VARIABLE have_tests)
-    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
-    if(have_tests)
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${RUNTIMES_LIT_TESTSUITES})
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${RUNTIMES_LIT_PARAMS})
-      set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${RUNTIMES_LIT_EXTRA_ARGS})
+    if (NOT EXISTS ${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
+      # This file will be later replaced by the runtimes subbuild.
+      file(TOUCH ${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
     endif()
+    include(${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
+    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${RUNTIMES_LIT_TESTSUITES})
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${RUNTIMES_LIT_PARAMS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${RUNTIMES_LIT_EXTRA_ARGS})
     set(runtimes-test-depends-${name} runtimes-test-depends)
     set(check-runtimes-${name} check-runtimes)
     list(APPEND ${name}_test_targets runtimes-test-depends-${name} check-runtimes-${name})