[issue27643] test_ctypes fails on AIX with xlc
Martin Panter
report at bugs.python.org
Wed Aug 17 20:43:44 EDT 2016
Martin Panter added the comment:
Michael, byref() is just a helper for passing an object’s address to a C function. Calling func(byref(b), ...) in Python is equivalent to the C code
unpack_bitfields(&b, ...)
I still think the root problem is in unpack_bitfields(). When compiled with XLC, your experiments confirm that it always returns unsigned values, and with GCC, it returns signed values.
It looks like you can detect XLC with the __IBMC__ and __xlC__ macros (not sure if there is a practical difference). So perhaps we can fix this with
#ifndef __xlC__
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