diff --git a/clang/tools/driver/CMakeLists.txt b/clang/tools/driver/CMakeLists.txt
--- a/clang/tools/driver/CMakeLists.txt
+++ b/clang/tools/driver/CMakeLists.txt
@@ -58,7 +58,7 @@
 
 add_dependencies(clang clang-resource-headers)
 
-if(NOT CLANG_LINKS_TO_CREATE)
+if(NOT DEFINED CLANG_LINKS_TO_CREATE)
   set(CLANG_LINKS_TO_CREATE clang++ clang-cl clang-cpp)
 endif()