Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -6,12 +6,7 @@
 
 cmake_policy(SET CMP0048 NEW)
 
-# CMake 3.1 and higher include generator expressions of the form
-# $<TARGETLIB:obj> in the SOURCES property.  These need to be
-# stripped everywhere that access the SOURCES property, so we just
-# defer to the OLD behavior of not including generator expressions
-# in the output for now.
-cmake_policy(SET CMP0051 OLD)
+cmake_policy(SET CMP0051 NEW)
 
 cmake_policy(SET CMP0056 NEW)