+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()
+