[issue29565] Still broken ctypes calling convention on MSVC / 64-bit Windows (large structs)

[Eryk Sun]

Eryk Sun added the comment:

Our support of passing structs and unions by value is really bad. Passing this particular struct by value is also broken on 64-bit Unix, but instead because it's small. It crashes Python due to an abort(). See issue 22273.

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nosy: +eryksun
priority: normal -> high
stage:  -> needs patch
versions: +Python 3.5, Python 3.6, Python 3.7

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<http://bugs.python.org/issue29565>
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