Delay compilation of cutils_ext until it is actually needed.

theano/compile/profilemode.py

 import time, atexit, copy
 
 from theano.gof.link import WrapLinker
-from theano.gof.cutils import run_cthunk
 from theano.compile.mode import Mode, register_mode, predefined_modes, predefined_linkers, predefined_optimizers
 from theano.gof.python25 import any
 from theano import gof
 from theano.configparser import config, AddConfigVar, IntParam, BoolParam
 from theano.compile.function_module import FunctionMaker
+run_cthunk = None # Will be imported only when needed.
 
 import_time = time.time()
 
@@ -85,7 +85,11 @@ class ProfileMode(Mode):
         def profile_thunk(i, node, th):
             """ Profile only the execution time
             """
+            global run_cthunk
             if hasattr(th, 'cthunk'):
+                if run_cthunk is None:
+                    # Lazy import to avoid compilation when importing theano.
+                    from theano.gof.cutils import run_cthunk
                 t0 = time.time()
                 failure = run_cthunk(th.cthunk)
                 dt = time.time() - t0
@@ -104,7 +108,11 @@ class ProfileMode(Mode):
         def profile_thunk2(i, node, th):
             """ Profile the execution time and the memory size.
             """
+            global run_cthunk
             if hasattr(th, 'cthunk'):
+                if run_cthunk is None:
+                    # Lazy import to avoid compilation when importing theano.
+                    from theano.gof.cutils import run_cthunk
                 t0 = time.time()
                 failure = run_cthunk(th.cthunk)
                 dt = time.time() - t0

theano/gof/cc.py

@@ -36,7 +36,6 @@ AddConfigVar('gcc.cxxflags',
         StrParam(""))
 
 # gof imports
-import cutils
 from env import Env
 import graph
 import link
@@ -63,6 +62,9 @@ def error(*args):
 
 from theano.gof.callcache import CallCache
 
+run_cthunk = None # Will be imported only when needed.
+
+
 def get_module_cache(init_args=None):
     """
     :param init_args: If not None, the (k, v) pairs in this dictionary will
@@ -1116,6 +1118,11 @@ class CLinker(link.Linker):
 
 def _execute(cthunk, init_tasks, tasks, error_storage):
     """WRITEME"""
+    global run_cthunk
+    if run_cthunk is None:
+        # Lazy import to avoid compilation when importing theano.
+        from theano.gof.cutils import run_cthunk
+
     def find_task(failure_code):
         """
         Maps a failure code to the task that is associated to it.
@@ -1128,7 +1135,7 @@ def _execute(cthunk, init_tasks, tasks, error_storage):
         else:
             return tasks[failure_code - n]
     def execute():
-        failure = cutils.run_cthunk(cthunk)
+        failure = run_cthunk(cthunk)
         if failure:
             task, taskname, id = find_task(failure)
             try: