Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -609,6 +609,7 @@
     CLANG_REPOSITORY_STRING
     CMAKE_MAKE_PROGRAM
     CMAKE_OSX_ARCHITECTURES
+    CMAKE_BUILD_TYPE
     LLVM_ENABLE_PROJECTS
     LLVM_ENABLE_RUNTIMES)