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Thu Jul 23 05:26:20 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-July/090744.html

>> What do you propose for doing proper alignment, then?
> 
> May be "void* dummy[4]" is better for force alignment ?

That would have the same alignment as a single pointer.

> What about alignment on platforms with pointers > 32 bit ?

The C compiler will choose the alignment of the union to be the
alignment of the union branch that requires that largest alignment.
So if the largest alignment is the one that a pointer has,
then alignof(PyGC_HEAD) == alignof(gc_next). The double is in the
union only in case it has larger alignment than a pointer.

Regards,
Martin

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[Python-Dev] mingw32 and gc-header weirdness