Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -7,6 +7,15 @@
   set(CMAKE_BUILD_TYPE "Debug")
 endif()
 
+if (POLICY CMP0051)
+  # 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)
+endif()
+
 if(POLICY CMP0022)
   cmake_policy(SET CMP0022 NEW) # automatic when 2.8.12 is required
 endif()