Do not add default compiledir to sys.path anymore.

theano/gof/compiledir.py

@@ -29,8 +29,6 @@ def is_valid_compiledir(path):
         # returned -1 for an unknown reason; the alternate approach here worked
         # in all cases... it was weird.
         open(os.path.join(path, '__init__.py'), 'w').close()
-        if path not in sys.path:
-            sys.path.append(path)
     except:
         return False
     

theano/gof/cutils.py

-import os
+import os, sys
 from compilelock import get_lock, release_lock
 from theano import config
 
@@ -11,6 +11,10 @@ if os.path.exists(os.path.join(config.compiledir,'cutils_ext.so')):
 # directory. This is important to prevent multiple processes from trying to
 # compile the cutils_ext module simultaneously.
 try:
+    # If we load a previously-compiled version, config.compiledir should
+    # by in sys.path
+    if config.compiledir not in sys.path:
+        sys.path.append(config.compiledir)
     from cutils_ext.cutils_ext import *
 except ImportError:
     import cmodule

theano/sandbox/cuda/__init__.py

@@ -75,6 +75,10 @@ if os.path.exists(cuda_ndarray_so):
     compile_cuda_ndarray = date>=os.stat(cuda_ndarray_so)[stat.ST_MTIME]
 if not compile_cuda_ndarray:
     try:
+        # If we load a previously-compiled version, config.compiledir should
+        # by in sys.path
+        if config.compiledir not in sys.path:
+            sys.path.append(config.compiledir)
         from cuda_ndarray.cuda_ndarray import *
     except ImportError:
         compile_cuda_ndarray = True