How backfilling works.
DISTRO_FEATURES[doc] = "The features enabled for the distribution." DISTRO_FEATURES_BACKFILL[doc] = "Features to be added to DISTRO_FEATURES if not also present in DISTRO_FEATURES_BACKFILL_CONSIDERED. This variable is set in the meta/conf/bitbake.conf file and it is not intended to be user-configurable." DISTRO_FEATURES_BACKFILL_CONSIDERED[doc] = "Features from DISTRO_FEATURES_BACKFILL that should not be backfilled (i.e. added to DISTRO_FEATURES) during the build." MACHINE_FEATURES[doc] = "Specifies the list of hardware features the MACHINE supports." MACHINE_FEATURES_BACKFILL[doc] = "Features to be added to MACHINE_FEATURES if not also present in MACHINE_FEATURES_BACKFILL_CONSIDERED. This variable is set in the meta/conf/bitbake.conf file and is not intended to be user-configurable." MACHINE_FEATURES_BACKFILL_CONSIDERED[doc] = "Features from MACHINE_FEATURES_BACKFILL that should not be backfilled (i.e. added to MACHINE_FEATURES) during the build."
DISTRO_FEATURES_BACKFILL = "pulseaudio sysvinit gobject-introspection-data ldconfig" MACHINE_FEATURES_BACKFILL = "rtc qemu-usermode"
def features_backfill(var,d): # This construct allows the addition of new features to variable specified # as var # Example for var = "DISTRO_FEATURES" # This construct allows the addition of new features to DISTRO_FEATURES # that if not present would disable existing functionality, without # disturbing distributions that have already set DISTRO_FEATURES. # Distributions wanting to elide a value in DISTRO_FEATURES_BACKFILL should # add the feature to DISTRO_FEATURES_BACKFILL_CONSIDERED features = (d.getVar(var) or "").split() backfill = (d.getVar(var+"_BACKFILL") or "").split() considered = (d.getVar(var+"_BACKFILL_CONSIDERED") or "").split() addfeatures =  for feature in backfill: if feature not in features and feature not in considered: addfeatures.append(feature) if addfeatures: d.appendVar(var, " " + " ".join(addfeatures))
You can prevent the SysVinit distribution feature from being automatically enabled with one of:
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit" DISTRO_FEATURES_BACKFILL_CONSIDERED_append = " sysvinit"