diff --git a/bitbake/lib/bb/codeparser.py b/bitbake/lib/bb/codeparser.py
index 116481559a..6e34eff999 100644
--- a/bitbake/lib/bb/codeparser.py
+++ b/bitbake/lib/bb/codeparser.py
@@ -1,6 +1,7 @@
 import ast
 import codegen
 import logging
+import collections
 import os.path
 import bb.utils, bb.data
 from itertools import chain
@@ -35,7 +36,7 @@ def check_indent(codestr):
 
 class CodeParserCache(MultiProcessCache):
     cache_file_name = "bb_codeparser.dat"
-    CACHE_VERSION = 3
+    CACHE_VERSION = 4
 
     def __init__(self):
         MultiProcessCache.__init__(self)
@@ -122,7 +123,11 @@ class PythonParser():
         name = self.called_node_name(node.func)
         if name in self.getvars or name in self.containsfuncs:
             if isinstance(node.args[0], ast.Str):
-                self.references.add(node.args[0].s)
+                varname = node.args[0].s
+                if name in self.containsfuncs and isinstance(node.args[1], ast.Str):
+                    self.contains[varname].add(node.args[1].s)
+                else:                      
+                    self.references.add(node.args[0].s)
             else:
                 self.warn(node.func, node.args[0])
         elif name in self.execfuncs:
@@ -148,6 +153,7 @@ class PythonParser():
 
     def __init__(self, name, log):
         self.var_execs = set()
+        self.contains = collections.defaultdict(set)
         self.execs = set()
         self.references = set()
         self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
@@ -161,14 +167,15 @@ class PythonParser():
         if h in codeparsercache.pythoncache:
             self.references = codeparsercache.pythoncache[h]["refs"]
             self.execs = codeparsercache.pythoncache[h]["execs"]
+            self.contains = codeparsercache.pythoncache[h]["contains"]
             return
 
         if h in codeparsercache.pythoncacheextras:
             self.references = codeparsercache.pythoncacheextras[h]["refs"]
             self.execs = codeparsercache.pythoncacheextras[h]["execs"]
+            self.contains = codeparsercache.pythoncacheextras[h]["contains"]
             return
 
-
         code = compile(check_indent(str(node)), "<string>", "exec",
                        ast.PyCF_ONLY_AST)
 
@@ -181,6 +188,7 @@ class PythonParser():
         codeparsercache.pythoncacheextras[h] = {}
         codeparsercache.pythoncacheextras[h]["refs"] = self.references
         codeparsercache.pythoncacheextras[h]["execs"] = self.execs
+        codeparsercache.pythoncacheextras[h]["contains"] = self.contains
 
 class ShellParser():
     def __init__(self, name, log):
diff --git a/bitbake/lib/bb/data.py b/bitbake/lib/bb/data.py
index bdd1e79e24..3d2c6a4975 100644
--- a/bitbake/lib/bb/data.py
+++ b/bitbake/lib/bb/data.py
@@ -299,6 +299,21 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
         vardeps = varflags.get("vardeps")
         value = d.getVar(key, False)
 
+        def handle_contains(value, contains, d):
+            newvalue = ""
+            for k in contains:
+                l = (d.getVar(k, True) or "").split()
+                for word in contains[k]:
+                    if word in l:
+                        newvalue += "\n%s{%s} = Set" %  (k, word)
+                    else:
+                        newvalue += "\n%s{%s} = Unset" %  (k, word)
+            if not newvalue:
+                return value
+            if not value:
+                return newvalue
+            return value + newvalue
+
         if "vardepvalue" in varflags:
            value = varflags.get("vardepvalue")
         elif varflags.get("func"):
@@ -309,6 +324,7 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
                     logger.warn("Variable %s contains tabs, please remove these (%s)" % (key, d.getVar("FILE", True)))
                 parser.parse_python(parsedvar.value)
                 deps = deps | parser.references
+                value = handle_contains(value, parser.contains, d)
             else:
                 parsedvar = d.expandWithRefs(value, key)
                 parser = bb.codeparser.ShellParser(key, logger)
@@ -318,10 +334,12 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
                 parser.log.flush()
             deps = deps | parsedvar.references
             deps = deps | (keys & parser.execs) | (keys & parsedvar.execs)
+            value = handle_contains(value, parsedvar.contains, d)
         else:
             parser = d.expandWithRefs(value, key)
             deps |= parser.references
             deps = deps | (keys & parser.execs)
+            value = handle_contains(value, parser.contains, d)
 
         # Add varflags, assuming an exclusion list is set
         if varflagsexcl:
diff --git a/bitbake/lib/bb/data_smart.py b/bitbake/lib/bb/data_smart.py
index a1cbaba62b..9a6f767116 100644
--- a/bitbake/lib/bb/data_smart.py
+++ b/bitbake/lib/bb/data_smart.py
@@ -35,6 +35,7 @@ import hashlib
 import bb, bb.codeparser
 from bb   import utils
 from bb.COW  import COWDictBase
+import collections
 
 logger = logging.getLogger("BitBake.Data")
 
@@ -88,6 +89,7 @@ class VariableParse:
 
         self.references = set()
         self.execs = set()
+        self.contains = collections.defaultdict(set)
 
     def var_sub(self, match):
             key = match.group()[2:-1]
@@ -120,6 +122,8 @@ class VariableParse:
             self.references |= parser.references
             self.execs |= parser.execs
 
+            for k in parser.contains:
+                self.contains[k].update(parser.contains[k])
             value = utils.better_eval(codeobj, DataContext(self.d))
             return str(value)