Our build environment uses -Wno-error. However, this causes problems enabling all the functions in built-in module 'time':

configure:11130: checking for strftime
-
-
cc1: warnings being treated as errors
conftest.c:236: error: conflicting types for built-in function 'strftime'

Because strftime was not enabled, we had problems running xmlrpc.client:

>>> from xmlrpc import client 
Traceback (most recent call last):   File "<stdin>", line 1, in <module>   File "XXX/lib64/python3.5/xmlrpc/client.py", line 267, in <module>     if _day0.strftime('%Y') == '0001':      # Mac OS X AttributeError: module 'time' has no attribute 'strftime' >>>

As a workaround, I am passing -fno-builtin now. But I believe this should be handled on the python end