Stop warning for /usr/bin/clang++.

theano/configdefaults.py

@@ -446,7 +446,7 @@ if param and os.name == 'nt':
 
 def warn_cxx(val):
     """We only support clang++ as otherwise we hit strange g++/OSX bugs."""
-    if sys.platform == 'darwin' and val != 'clang++':
+    if sys.platform == 'darwin' and 'clang++' not in val:
         _logger.warning("Only clang++ is supported. With g++,"
                         " we end up with strange g++/OSX bugs.")
     return True