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Fri Jul 24 14:16:06 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-July/090805.html

Christian Tismer wrote:
> Hi all,
> 
> I was hacking to get mingw32 builds of psyco to work
> and found a pretty weird thing:
> 
> I used mingw32 (stable distro) to build the psyco extension
> on top of standard python2.6, built with Visual Studio,
> and got weird crashes.
> 
> The reason is in objimpl.h:
> 
> typedef union _gc_head {
>     struct {
>         union _gc_head *gc_next;
>         union _gc_head *gc_prev;
>         Py_ssize_t gc_refs;
>     } gc;
>     long double dummy;  /* force worst-case alignment */
> } PyGC_Head;
[SNIP]

Did the crash disappear is you add "__attribute__((aligned(8)))" after 
variable dummy ?

Regards,
Roumen

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[Python-Dev] mingw32 and gc-header weirdness