Jeffrey Walton added the comment:
This might be relevant. It showed up while building Python 3.3.5 from sources.
/usr/local/bin/clang -fsanitize=undefined -fPIC -Wno-unused-result -DNDEBUG -g
-fwrapv -O3 -Wall -Wstrict-prototypes -I./Include -I. -IInclude
-I/usr/local/include -IPython-3.3.5/./Include -IPython-3.3.5/. -c
Python-3.3.5/./Modules/socketmodule.c -o
build/temp.linux-x86_64-3.3Python-3.3.5/./Modules/socketmodule.o
Python-3.3.5/./Modules/socketmodule.c:1951:74: warning:
comparison of unsigned expression < 0 is always false
[-Wtautological-compare]
if (cmsgh == NULL || msg->msg_control == NULL || msg->msg_controllen < 0)
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<http://bugs.python.org/issue20937>
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