This imports various environment variables into the scons environment, and sets some general properties on it. These are basically just copied directly from the SConstruct and have the same behavior here. gem5_tool_list will be used later on to add scons "tools" which should be automatically added to new Environment objects. Change-Id: Ib255955090c7b1e1cb80c703c18a9c867fcf1c9e Reviewed-on: https://gem5-review.googlesource.com/5562 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>