now traceback.limit==-1 mean all and print info about it where appropriate.

theano/configdefaults.py

@@ -70,5 +70,5 @@ AddConfigVar('cmodule.mac_framework_link',
         BoolParam(False))
 
 AddConfigVar('traceback.limit',
-             "The number of stack to trace. 0 mean all.",
-             IntParam(0))
+             "The number of stack to trace. -1 mean all.",
+             IntParam(-1))

theano/gof/link.py

@@ -28,6 +28,7 @@ def thunk_hook(type, value, trace):
             print>>sys.stderr, "Definition in: "
             for line in traceback.format_list(trace2):
                 print>>sys.stderr, line,
+            print>>sys.stderr, "For the full definition stack trace set the Theano flags traceback.limit to -1"
     __excepthook(type, value, trace)
 sys.excepthook = thunk_hook
 

theano/gof/op.py

@@ -321,7 +321,7 @@ class PureOp(object):
         """
         node = self.make_node(*inputs, **kwargs)
         limit = config.traceback.limit
-        if limit == 0: limit = None
+        if limit == -1: limit = None
         node.tag.trace = traceback.extract_stack(limit=limit)[:-1]
         if self.default_output is not None:
             return node.outputs[self.default_output]

theano/gof/type.py

@@ -246,7 +246,7 @@ class PureType(object):
         """
         r = self.make_variable(name)
         limit = config.traceback.limit
-        if limit == 0: limit = None
+        if limit == -1: limit = None
         r.tag.trace = traceback.extract_stack(limit=limit)[:-1]
         return r