Consolidate the exec/eval bits, switch anonfunc to better_exec, etc

The methodpool, ${@} expansions, anonymous python functions, event handlers
now all run with the same global context, ensuring a consistent environment
for them.  Added a bb.utils.better_eval function which does an eval() with the
same globals as better_exec.

(Bitbake rev: 424d7e267b009cc19b8503eadab782736d9597d0)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/build.py

@@ -203,16 +203,14 @@ def exec_func_python(func, d, runfile, logfile):
     import re, os
 
     bbfile = bb.data.getVar('FILE', d, 1)
-    tmp  = "def " + func + "():\n%s" % data.getVar(func, d)
-    tmp += '\n' + func + '()'
+    tmp  = "def " + func + "(d):\n%s" % data.getVar(func, d)
+    tmp += '\n' + func + '(d)'
 
     f = open(runfile, "w")
     f.write(tmp)
     comp = utils.better_compile(tmp, func, bbfile)
-    g = {} # globals
-    g['d'] = d
     try:
-        utils.better_exec(comp, g, tmp, bbfile)
+        utils.better_exec(comp, {"d": d}, tmp, bbfile)
     except:
         (t,value,tb) = sys.exc_info()