Aligned access to c structures (how to avoid)

[Marc Auslander]

The trouble with the sort of packing you propose is that it does not
provide "left to right equivalence".  In other words, adding something
to the end of a structure can change the mappings of fields that
precede it.  Consider the trouble this causes when you need to extend
a structure without recompiling the world.
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Marc Auslander       <marc at ibm.com>