diff --git a/yocto-poky/bitbake/lib/bb/build.py b/yocto-poky/bitbake/lib/bb/build.py
index 22428a6..db5072c 100644
--- a/yocto-poky/bitbake/lib/bb/build.py
+++ b/yocto-poky/bitbake/lib/bb/build.py
@@ -156,7 +156,12 @@
     def flush(self):
         self.outfile.flush()
 
-def exec_func(func, d, dirs = None):
+#
+# pythonexception allows the python exceptions generated to be raised
+# as the real exceptions (not FuncFailed) and without a backtrace at the 
+# origin of the failure.
+#
+def exec_func(func, d, dirs = None, pythonexception=False):
     """Execute a BB 'function'"""
 
     body = d.getVar(func, False)
@@ -224,22 +229,18 @@
 
     with bb.utils.fileslocked(lockfiles):
         if ispython:
-            exec_func_python(func, d, runfile, cwd=adir)
+            exec_func_python(func, d, runfile, cwd=adir, pythonexception=pythonexception)
         else:
             exec_func_shell(func, d, runfile, cwd=adir)
 
 _functionfmt = """
-def {function}(d):
-{body}
-
 {function}(d)
 """
 logformatter = bb.msg.BBLogFormatter("%(levelname)s: %(message)s")
-def exec_func_python(func, d, runfile, cwd=None):
+def exec_func_python(func, d, runfile, cwd=None, pythonexception=False):
     """Execute a python BB 'function'"""
 
-    bbfile = d.getVar('FILE', True)
-    code = _functionfmt.format(function=func, body=d.getVar(func, True))
+    code = _functionfmt.format(function=func)
     bb.utils.mkdirhier(os.path.dirname(runfile))
     with open(runfile, 'w') as script:
         bb.data.emit_func_python(func, script, d)
@@ -254,11 +255,18 @@
     bb.debug(2, "Executing python function %s" % func)
 
     try:
-        comp = utils.better_compile(code, func, bbfile)
-        utils.better_exec(comp, {"d": d}, code, bbfile)
+        text = "def %s(d):\n%s" % (func, d.getVar(func, False))
+        fn = d.getVarFlag(func, "filename", False)
+        lineno = int(d.getVarFlag(func, "lineno", False))
+        bb.methodpool.insert_method(func, text, fn, lineno - 1)
+
+        comp = utils.better_compile(code, func, "exec_python_func() autogenerated")
+        utils.better_exec(comp, {"d": d}, code, "exec_python_func() autogenerated", pythonexception=pythonexception)
     except (bb.parse.SkipRecipe, bb.build.FuncFailed):
         raise
     except:
+        if pythonexception:
+            raise
         raise FuncFailed(func, None)
     finally:
         bb.debug(2, "Python function %s finished" % func)
@@ -277,9 +285,8 @@
     case $ret in
     0)  ;;
     *)  case $BASH_VERSION in
-        "")   echo "WARNING: exit code $ret from a shell command.";;
-        *)    echo "WARNING: ${BASH_SOURCE[0]}:${BASH_LINENO[0]} exit $ret from
-  \"$BASH_COMMAND\"";;
+        "") echo "WARNING: exit code $ret from a shell command.";;
+        *)  echo "WARNING: ${BASH_SOURCE[0]}:${BASH_LINENO[0]} exit $ret from '$BASH_COMMAND'";;
         esac
         exit $ret
     esac
@@ -319,7 +326,7 @@
     os.chmod(runfile, 0775)
 
     cmd = runfile
-    if d.getVarFlag(func, 'fakeroot'):
+    if d.getVarFlag(func, 'fakeroot', False):
         fakerootcmd = d.getVar('FAKEROOT', True)
         if fakerootcmd:
             cmd = [fakerootcmd, runfile]
@@ -394,7 +401,7 @@
     Execution of a task involves a bit more setup than executing a function,
     running it with its own local metadata, and with some useful variables set.
     """
-    if not d.getVarFlag(task, 'task'):
+    if not d.getVarFlag(task, 'task', False):
         event.fire(TaskInvalid(task, d), d)
         logger.error("No such task: %s" % task)
         return 1
@@ -533,7 +540,7 @@
             bb.utils.remove(loglink)
     event.fire(TaskSucceeded(task, logfn, localdata), localdata)
 
-    if not localdata.getVarFlag(task, 'nostamp') and not localdata.getVarFlag(task, 'selfstamp'):
+    if not localdata.getVarFlag(task, 'nostamp', False) and not localdata.getVarFlag(task, 'selfstamp', False):
         make_stamp(task, localdata)
 
     return 0
@@ -541,7 +548,7 @@
 def exec_task(fn, task, d, profile = False):
     try:
         quieterr = False
-        if d.getVarFlag(task, "quieterrors") is not None:
+        if d.getVarFlag(task, "quieterrors", False) is not None:
             quieterr = True
 
         if profile:
@@ -582,10 +589,10 @@
         taskflagname = taskname.replace("_setscene", "")
 
     if file_name:
-        stamp = d.stamp_base[file_name].get(taskflagname) or d.stamp[file_name]
+        stamp = d.stamp[file_name]
         extrainfo = d.stamp_extrainfo[file_name].get(taskflagname) or ""
     else:
-        stamp = d.getVarFlag(taskflagname, 'stamp-base', True) or d.getVar('STAMP', True)
+        stamp = d.getVar('STAMP', True)
         file_name = d.getVar('BB_FILENAME', True)
         extrainfo = d.getVarFlag(taskflagname, 'stamp-extra-info', True) or ""
 
@@ -616,10 +623,10 @@
         taskflagname = taskname.replace("_setscene", "")
 
     if file_name:
-        stamp = d.stamp_base_clean[file_name].get(taskflagname) or d.stampclean[file_name]
+        stamp = d.stampclean[file_name]
         extrainfo = d.stamp_extrainfo[file_name].get(taskflagname) or ""
     else:
-        stamp = d.getVarFlag(taskflagname, 'stamp-base-clean', True) or d.getVar('STAMPCLEAN', True)
+        stamp = d.getVar('STAMPCLEAN', True)
         file_name = d.getVar('BB_FILENAME', True)
         extrainfo = d.getVarFlag(taskflagname, 'stamp-extra-info', True) or ""
 
@@ -746,7 +753,7 @@
         bbtasks.append(task)
     d.setVar('__BBTASKS', bbtasks)
 
-    existing = d.getVarFlag(task, "deps") or []
+    existing = d.getVarFlag(task, "deps", False) or []
     if after is not None:
         # set up deps for function
         for entry in after.split():
@@ -756,7 +763,7 @@
     if before is not None:
         # set up things that depend on this func
         for entry in before.split():
-            existing = d.getVarFlag(entry, "deps") or []
+            existing = d.getVarFlag(entry, "deps", False) or []
             if task not in existing:
                 d.setVarFlag(entry, "deps", [task] + existing)
 
@@ -771,7 +778,7 @@
 
     d.delVarFlag(task, 'deps')
     for bbtask in d.getVar('__BBTASKS', False) or []:
-        deps = d.getVarFlag(bbtask, 'deps') or []
+        deps = d.getVarFlag(bbtask, 'deps', False) or []
         if task in deps:
             deps.remove(task)
             d.setVarFlag(bbtask, 'deps', deps)