diff --git a/poky/scripts/lib/devtool/build.py b/poky/scripts/lib/devtool/build.py
index 252379e..ba9593f 100644
--- a/poky/scripts/lib/devtool/build.py
+++ b/poky/scripts/lib/devtool/build.py
@@ -54,7 +54,11 @@
     """Entry point for the devtool 'build' subcommand"""
     workspacepn = check_workspace_recipe(workspace, args.recipename, bbclassextend=True)
 
-    build_tasks = _get_build_tasks(config)
+    if args.clean:
+        # use clean instead of cleansstate to avoid messing things up in eSDK
+        build_tasks = ['do_clean']
+    else:
+        build_tasks = _get_build_tasks(config)
 
     bbappend = workspace[workspacepn]['bbappend']
     if args.disable_parallel_make:
@@ -83,4 +87,5 @@
                                          group='working', order=50)
     parser_build.add_argument('recipename', help='Recipe to build')
     parser_build.add_argument('-s', '--disable-parallel-make', action="store_true", help='Disable make parallelism')
+    parser_build.add_argument('-c', '--clean', action='store_true', help='clean up recipe building results')
     parser_build.set_defaults(func=build)
diff --git a/poky/scripts/lib/devtool/export.py b/poky/scripts/lib/devtool/export.py
index 13ee258..35349e2 100644
--- a/poky/scripts/lib/devtool/export.py
+++ b/poky/scripts/lib/devtool/export.py
@@ -84,7 +84,7 @@
 
     # if all workspace is excluded, quit
     if not len(set(workspace.keys()).difference(set(args.exclude))):
-        logger.warn('All recipes in workspace excluded, nothing to export')
+        logger.warning('All recipes in workspace excluded, nothing to export')
         return 0
 
     exported = []
diff --git a/poky/scripts/lib/devtool/import.py b/poky/scripts/lib/devtool/import.py
index c13a180..4264b7d 100644
--- a/poky/scripts/lib/devtool/import.py
+++ b/poky/scripts/lib/devtool/import.py
@@ -81,7 +81,7 @@
                     break
             else:
                 non_importables.append(fn)
-                logger.warn('No recipe to append %s.bbapppend, skipping' % fn)
+                logger.warning('No recipe to append %s.bbapppend, skipping' % fn)
 
         # Extract
         imported = []
@@ -104,9 +104,9 @@
                         try:
                             tar.extract(member, path=config.workspace_path)
                         except PermissionError as pe:
-                            logger.warn(pe)
+                            logger.warning(pe)
                     else:
-                        logger.warn('File already present. Use --overwrite/-o to overwrite it: %s' % member.name)
+                        logger.warning('File already present. Use --overwrite/-o to overwrite it: %s' % member.name)
                         continue
                 else:
                     tar.extract(member, path=config.workspace_path)
@@ -129,7 +129,7 @@
     if imported:
         logger.info('Imported recipes into workspace %s: %s' % (config.workspace_path, ', '.join(imported)))
     else:
-        logger.warn('No recipes imported into the workspace')
+        logger.warning('No recipes imported into the workspace')
 
     return 0
 
diff --git a/poky/scripts/lib/devtool/standard.py b/poky/scripts/lib/devtool/standard.py
index a1e8e1d..d14b7a6 100644
--- a/poky/scripts/lib/devtool/standard.py
+++ b/poky/scripts/lib/devtool/standard.py
@@ -66,7 +66,7 @@
             args.srctree = args.recipename
             args.recipename = None
         elif os.path.isdir(args.recipename):
-            logger.warn('Ambiguous argument "%s" - assuming you mean it to be the recipe name' % args.recipename)
+            logger.warning('Ambiguous argument "%s" - assuming you mean it to be the recipe name' % args.recipename)
 
     if not args.fetchuri:
         if args.srcrev:
@@ -82,7 +82,7 @@
         if args.fetchuri:
             raise DevtoolError('URI specified as positional argument as well as -f/--fetch')
         else:
-            logger.warn('-f/--fetch option is deprecated - you can now simply specify the URL to fetch as a positional argument instead')
+            logger.warning('-f/--fetch option is deprecated - you can now simply specify the URL to fetch as a positional argument instead')
             args.fetchuri = args.fetch
 
     if args.recipename:
@@ -217,7 +217,7 @@
             raise DevtoolError('Command \'%s\' did not create any recipe file:\n%s' % (e.command, e.stdout))
         attic_recipe = os.path.join(config.workspace_path, 'attic', recipename, os.path.basename(recipefile))
         if os.path.exists(attic_recipe):
-            logger.warn('A modified recipe from a previous invocation exists in %s - you may wish to move this over the top of the new recipe if you had changes in it that you want to continue with' % attic_recipe)
+            logger.warning('A modified recipe from a previous invocation exists in %s - you may wish to move this over the top of the new recipe if you had changes in it that you want to continue with' % attic_recipe)
     finally:
         if tmpsrcdir and os.path.exists(tmpsrcdir):
             shutil.rmtree(tmpsrcdir)
@@ -295,7 +295,7 @@
                     with open(layerconf_file, 'a') as f:
                         f.write('%s = "%s"\n' % (preferred_provider, recipe_name))
                 else:
-                    logger.warn('Set \'%s\' in order to use the recipe' % preferred_provider)
+                    logger.warning('Set \'%s\' in order to use the recipe' % preferred_provider)
                 break
 
         _add_md5(config, recipename, appendfile)
@@ -704,7 +704,7 @@
                     if splitline[2] != md5:
                         bb.utils.mkdirhier(preservepath)
                         preservefile = os.path.basename(removefile)
-                        logger.warn('File %s modified since it was written, preserving in %s' % (preservefile, preservepath))
+                        logger.warning('File %s modified since it was written, preserving in %s' % (preservefile, preservepath))
                         shutil.move(removefile, os.path.join(preservepath, preservefile))
                     else:
                         os.remove(removefile)
@@ -795,7 +795,7 @@
                 if branchname.startswith(override_branch_prefix):
                     branches.append(branchname)
             if branches:
-                logger.warn('SRC_URI is conditionally overridden in this recipe, thus several %s* branches have been created, one for each override that makes changes to SRC_URI. It is recommended that you make changes to the %s branch first, then checkout and rebase each %s* branch and update any unique patches there (duplicates on those branches will be ignored by devtool finish/update-recipe)' % (override_branch_prefix, args.branch, override_branch_prefix))
+                logger.warning('SRC_URI is conditionally overridden in this recipe, thus several %s* branches have been created, one for each override that makes changes to SRC_URI. It is recommended that you make changes to the %s branch first, then checkout and rebase each %s* branch and update any unique patches there (duplicates on those branches will be ignored by devtool finish/update-recipe)' % (override_branch_prefix, args.branch, override_branch_prefix))
             branches.insert(0, args.branch)
             seen_patches = []
             for branch in branches:
@@ -1720,7 +1720,7 @@
         if updated:
             rf = rd.getVar('FILE')
             if rf.startswith(config.workspace_path):
-                logger.warn('Recipe file %s has been updated but is inside the workspace - you will need to move it (and any associated files next to it) out to the desired layer before using "devtool reset" in order to keep any changes' % rf)
+                logger.warning('Recipe file %s has been updated but is inside the workspace - you will need to move it (and any associated files next to it) out to the desired layer before using "devtool reset" in order to keep any changes' % rf)
     finally:
         tinfoil.shutdown()
 
@@ -1803,7 +1803,7 @@
             if os.path.exists(origdir):
                 for root, dirs, files in os.walk(origdir):
                     for fn in files:
-                        logger.warn('Preserving %s in %s' % (fn, preservepath))
+                        logger.warning('Preserving %s in %s' % (fn, preservepath))
                         _move_file(os.path.join(origdir, fn),
                                    os.path.join(preservepath, fn))
                     for dn in dirs:
diff --git a/poky/scripts/lib/devtool/upgrade.py b/poky/scripts/lib/devtool/upgrade.py
index c3fd866..2020077 100644
--- a/poky/scripts/lib/devtool/upgrade.py
+++ b/poky/scripts/lib/devtool/upgrade.py
@@ -264,7 +264,7 @@
     if no_patch:
         patches = oe.recipeutils.get_recipe_patches(crd)
         if patches:
-            logger.warn('By user choice, the following patches will NOT be applied to the new source tree:\n  %s' % '\n  '.join([os.path.basename(patch) for patch in patches]))
+            logger.warning('By user choice, the following patches will NOT be applied to the new source tree:\n  %s' % '\n  '.join([os.path.basename(patch) for patch in patches]))
     else:
         __run('git checkout devtool-patched -b %s' % branch)
         skiptag = False
@@ -273,9 +273,9 @@
         except bb.process.ExecutionError as e:
             skiptag = True
             if 'conflict' in e.stdout:
-                logger.warn('Command \'%s\' failed:\n%s\n\nYou will need to resolve conflicts in order to complete the upgrade.' % (e.command, e.stdout.rstrip()))
+                logger.warning('Command \'%s\' failed:\n%s\n\nYou will need to resolve conflicts in order to complete the upgrade.' % (e.command, e.stdout.rstrip()))
             else:
-                logger.warn('Command \'%s\' failed:\n%s' % (e.command, e.stdout))
+                logger.warning('Command \'%s\' failed:\n%s' % (e.command, e.stdout))
         if not skiptag:
             if uri.startswith('git://'):
                 suffix = 'new'
@@ -420,7 +420,10 @@
                 logger.info('Source subdirectory has changed, updating S value')
 
     if license_diff:
-        newlicchksum = " ".join(["file://{};md5={}".format(l["path"], l["actual_md5"]) + (";beginline={}".format(l["beginline"]) if l["beginline"] else "") + (";endline={}".format(l["endline"]) if l["endline"] else "") for l in new_licenses])
+        newlicchksum = " ".join(["file://{}".format(l['path']) +
+                                 (";beginline={}".format(l['beginline']) if l['beginline'] else "") +
+                                 (";endline={}".format(l['endline']) if l['endline'] else "") +
+                                 (";md5={}".format(l['actual_md5'])) for l in new_licenses])
         newvalues["LIC_FILES_CHKSUM"] = newlicchksum
         _add_license_diff_to_recipe(fullpath, license_diff)