See this bug report: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=467145&group_id=5470 The GC header adds 12 bytes to the start of the object, but for objects (like complex) that contain a double and require double alignment, that messes up the alignment. Something needs to be done about this: I'm guessing a configuration test for the required alignment of double, and a rounding up of the GC head size to a multiple of that. Should affect only the AS_GC and FROM_GC macros in gcmodule.c and the two uses of sizeof(PyGC_Head) there -- unless you can figure out a way to add a pad field to the GC head only when needed, then a change to objimpl.h might be sufficient. So far this only affects HP hardware, but we can't trust that! (It hasn't affected 2.0 or 2.1 because it only breaks when I *subclass* complex.) --Guido van Rossum (home page: http://www.python.org/~guido/)
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