Defaults to true. When set to false Iris and various tools can be built without ELK support. In both cases this means supporting only Gfx9+. This option must be true to build Crocus or Hasvk. This allows skipping re-building ELK when developing for newer platforms with tools/tests enabled. Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11575 Reviewed-by: Daniel Stone <daniels@collabora.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Acked-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33054>