This will ensure that the value of USE_SYSTEMC is consistent throughout the build. It also has the side effect that USE_SYSTEMC can be forced to a particular value if you're confident you know what you're doing and want to override these checks. Change-Id: I0f2d1153245ff17ce4a828c6b7496cb9ded6bd5b Reviewed-on: https://gem5-review.googlesource.com/c/16810 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>