diff --git a/yocto-poky/bitbake/lib/bb/utils.py b/yocto-poky/bitbake/lib/bb/utils.py
index 31ec2b7..3544bbe 100644
--- a/yocto-poky/bitbake/lib/bb/utils.py
+++ b/yocto-poky/bitbake/lib/bb/utils.py
@@ -33,6 +33,7 @@
 import traceback
 import errno
 import signal
+import ast
 from commands import getstatusoutput
 from contextlib import contextmanager
 from ctypes import cdll
@@ -291,19 +292,26 @@
             error.append('     %.4d:%s' % (i, body[i-1].rstrip()))
     return error
 
-def better_compile(text, file, realfile, mode = "exec"):
+def better_compile(text, file, realfile, mode = "exec", lineno = 0):
     """
     A better compile method. This method
     will print the offending lines.
     """
     try:
-        return compile(text, file, mode)
+        cache = bb.methodpool.compile_cache(text)
+        if cache:
+            return cache
+        # We can't add to the linenumbers for compile, we can pad to the correct number of blank lines though
+        text2 = "\n" * int(lineno) + text
+        code = compile(text2, realfile, mode)
+        bb.methodpool.compile_cache_add(text, code)
+        return code
     except Exception as e:
         error = []
         # split the text into lines again
         body = text.split('\n')
-        error.append("Error in compiling python function in %s:\n" % realfile)
-        if e.lineno:
+        error.append("Error in compiling python function in %s, line %s:\n" % (realfile, lineno))
+        if hasattr(e, "lineno"):
             error.append("The code lines resulting in this error were:")
             error.extend(_print_trace(body, e.lineno))
         else:
@@ -323,8 +331,10 @@
         exception = traceback.format_exception_only(t, value)
         error.append('Error executing a python function in %s:\n' % realfile)
 
-        # Strip 'us' from the stack (better_exec call)
-        tb = tb.tb_next
+        # Strip 'us' from the stack (better_exec call) unless that was where the 
+        # error came from
+        if tb.tb_next is not None:
+            tb = tb.tb_next
 
         textarray = text.split('\n')
 
@@ -353,15 +363,6 @@
                         error.extend(_print_trace(text, tbextract[level+1][1]))
                 except:
                     error.append(tbformat[level+1])
-            elif "d" in context and tbextract[level+1][2]:
-                # Try and find the code in the datastore based on the functionname
-                d = context["d"]
-                functionname = tbextract[level+1][2]
-                text = d.getVar(functionname, True)
-                if text:
-                    error.extend(_print_trace(text.split('\n'), tbextract[level+1][1]))
-                else:
-                    error.append(tbformat[level+1])
             else:
                 error.append(tbformat[level+1])
             nexttb = tb.tb_next
@@ -371,7 +372,7 @@
     finally:
         logger.error("\n".join(error))
 
-def better_exec(code, context, text = None, realfile = "<code>"):
+def better_exec(code, context, text = None, realfile = "<code>", pythonexception=False):
     """
     Similiar to better_compile, better_exec will
     print the lines that are responsible for the
@@ -388,6 +389,8 @@
         # Error already shown so passthrough, no need for traceback
         raise
     except Exception as e:
+        if pythonexception:
+            raise
         (t, value, tb) = sys.exc_info()
         try:
             _print_exception(t, value, tb, realfile, text, context)
@@ -533,6 +536,21 @@
             s.update(line)
     return s.hexdigest()
 
+def sha1_file(filename):
+    """
+    Return the hex string representation of the SHA1 checksum of the filename
+    """
+    try:
+        import hashlib
+    except ImportError:
+        return None
+
+    s = hashlib.sha1()
+    with open(filename, "rb") as f:
+        for line in f:
+            s.update(line)
+    return s.hexdigest()
+
 def preserved_envvars_exported():
     """Variables which are taken from the environment and placed in and exported
     from the metadata"""
@@ -621,7 +639,7 @@
     """
     import bb.data
     for var in bb.data.keys(d):
-        export = d.getVarFlag(var, "export")
+        export = d.getVarFlag(var, "export", False)
         if export:
             os.environ[var] = d.getVar(var, True) or ""
 
@@ -906,6 +924,24 @@
         raise ValueError("Invalid value for to_boolean: %s" % string)
 
 def contains(variable, checkvalues, truevalue, falsevalue, d):
+    """Check if a variable contains all the values specified.
+
+    Arguments:
+
+    variable -- the variable name. This will be fetched and expanded (using
+    d.getVar(variable, True)) and then split into a set().
+
+    checkvalues -- if this is a string it is split on whitespace into a set(),
+    otherwise coerced directly into a set().
+
+    truevalue -- the value to return if checkvalues is a subset of variable.
+
+    falsevalue -- the value to return if variable is empty or if checkvalues is
+    not a subset of variable.
+
+    d -- the data store.
+    """
+
     val = d.getVar(variable, True)
     if not val:
         return falsevalue
@@ -914,7 +950,7 @@
         checkvalues = set(checkvalues.split())
     else:
         checkvalues = set(checkvalues)
-    if checkvalues.issubset(val): 
+    if checkvalues.issubset(val):
         return truevalue
     return falsevalue
 
@@ -1140,7 +1176,7 @@
                 if in_var.endswith('()'):
                     if full_value.count('{') - full_value.count('}') >= 0:
                         continue
-                full_value = full_value[:-1]
+                    full_value = full_value[:-1]
                 if handle_var_end():
                     updated = True
                     checkspc = True
@@ -1385,3 +1421,33 @@
             raise ValueError("Unable to set ioprio, syscall returned %s" % rc)
     else:
         bb.warn("Unable to set IO Prio for arch %s" % _unamearch)
+
+def set_process_name(name):
+    from ctypes import cdll, byref, create_string_buffer
+    # This is nice to have for debugging, not essential
+    try:
+        libc = cdll.LoadLibrary('libc.so.6')
+        buff = create_string_buffer(len(name)+1)
+        buff.value = name
+        libc.prctl(15, byref(buff), 0, 0, 0)
+    except:
+        pass
+
+# export common proxies variables from datastore to environment
+def export_proxies(d):
+    import os
+
+    variables = ['http_proxy', 'HTTP_PROXY', 'https_proxy', 'HTTPS_PROXY',
+                    'ftp_proxy', 'FTP_PROXY', 'no_proxy', 'NO_PROXY']
+    exported = False
+
+    for v in variables:
+        if v in os.environ.keys():
+            exported = True
+        else:
+            v_proxy = d.getVar(v, True)
+            if v_proxy is not None:
+                os.environ[v] = v_proxy
+                exported = True
+
+    return exported