Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -11,6 +11,10 @@
   cmake_policy(SET CMP0075 NEW)
 endif()

+if(POLICY CMP0077)
+  cmake_policy(SET CMP0077 NEW)
+endif()
+
 if(NOT DEFINED LLVM_VERSION_MAJOR)
   set(LLVM_VERSION_MAJOR 8)
 endif()