base.bbclass: don't backfill features that already exist

It's too easy to cause rebuilds because the DISTRO_FEATURES have changed in
meaningless ways (such as re-ordering or duplicate items).  Help stop this by
checking if the feature to be back-filled is already present.

(From OE-Core rev: 63c7192119d54b92d908441109ed4e4fff761cba)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index 4d69cafbcd..4ec1eda6bc 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -292,8 +292,8 @@ python base_eventhandler() {
         e.data.setVar('BB_VERSION', bb.__version__)
         pkgarch_mapping(e.data)
         preferred_ml_updates(e.data)
-        e.data.appendVar('DISTRO_FEATURES', oe.utils.features_backfill("DISTRO_FEATURES", e.data))
-        e.data.appendVar('MACHINE_FEATURES', oe.utils.features_backfill("MACHINE_FEATURES", e.data))
+        oe.utils.features_backfill("DISTRO_FEATURES", e.data)
+        oe.utils.features_backfill("MACHINE_FEATURES", e.data)
 
     if isinstance(e, bb.event.BuildStarted):
         statuslines = []