bitbake/cooker, bitbake-layers: show the .bbappend files that matches no existing .bb recipe

index 6b5ad5a..9266eb5 100755
@@ -54,7 +54,7 @@ class Commands(cmd.Cmd):
 
     def prepare_cooker(self):
         sys.stderr.write("Parsing recipes..")
-        logger.setLevel(logging.ERROR)
+        logger.setLevel(logging.WARNING)
 
         try:
             while self.cooker.state in (state.initial, state.parsing):

@@ -85,8 +85,6 @@ class Commands(cmd.Cmd):
 
         self.show_appends_for_skipped()
 
-        self.show_appends_with_no_recipes()
-
     def show_appends_for_pn(self, pn):
         filenames = self.cooker_data.pkg_pn[pn]
 

@@ -133,23 +131,6 @@ class Commands(cmd.Cmd):
                 notappended.add(basename)
         return appended, notappended
 
-    def show_appends_with_no_recipes(self):
-        recipes = set(os.path.basename(f)
-                      for f in self.cooker_data.pkg_fn.iterkeys())
-        recipes |= set(os.path.basename(f)
-                      for f in self.cooker.skiplist.iterkeys())
-        appended_recipes = self.cooker_data.appends.iterkeys()
-        appends_without_recipes = [self.cooker_data.appends[recipe]
-                                   for recipe in appended_recipes
-                                   if recipe not in recipes]
-        if appends_without_recipes:
-            appendlines = ('  %s' % append
-                           for appends in appends_without_recipes
-                           for append in appends)
-            logger.warn('No recipes available for:\n%s',
-                        '\n'.join(appendlines))
-            self.returncode |= 4
-
     def do_EOF(self, line):
         return True
 

index ebf963d..3aca8c6 100644
@@ -471,6 +471,27 @@ class BBCooker:
                 return pri
         return 0
 
+    def show_appends_with_no_recipes( self ):
+        recipes = set(os.path.basename(f)
+                      for f in self.status.pkg_fn.iterkeys())
+        recipes |= set(os.path.basename(f)
+                      for f in self.skiplist.iterkeys())
+        appended_recipes = self.appendlist.iterkeys()
+        appends_without_recipes = [self.appendlist[recipe]
+                                   for recipe in appended_recipes
+                                   if recipe not in recipes]
+        if appends_without_recipes:
+            appendlines = ('  %s' % append
+                           for appends in appends_without_recipes
+                           for append in appends)
+            msg = 'No recipes available for:\n%s' % '\n'.join(appendlines)
+            warn_only = data.getVar("BB_DANGLINGAPPENDS_WARNONLY", \
+                 self.configuration.data, False) or "no"
+            if warn_only.lower() in ("1", "yes", "true"):
+                bb.warn(msg)
+            else:
+                bb.fatal(msg)
+
     def buildDepgraph( self ):
         all_depends = self.status.all_depends
         pn_provides = self.status.pn_provides

@@ -940,6 +961,7 @@ class BBCooker:
 
         if not self.parser.parse_next():
             collectlog.debug(1, "parsing complete")
+            self.show_appends_with_no_recipes()
             self.buildDepgraph()
             self.state = state.running
             return None