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Sat Apr 8 10:26:59 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-April/063546.html

Michael Hudson wrote:
> "Tim Peters" <tim.peters at gmail.com> writes:
> 
>> _Perhaps_ it's the case that doubles are aligned to an 8-byte boundary
>> when socketmodule.c is compiled, but (for some unknown reason) only to
>> a 4-byte boundary when _ssl.c is compiled.  Although that seems to
>> match the details in the bug report, I have no theory for how that
>> could happen (I don't see any MS packing pragmas anywhere).
> 
> Well, poking a bit reveals that _ssl and _socket are built by quite
> different mechanisms: _socket by a .vcproj but _ssl by "_ssl.mak".  I
> don't see anything overly suspicious in _ssl.mak, but I don't really
> know much about Windows compiler options...

A mailing list post found via Google suggests that Visual Studio automatically
sets the struct member alignment to 4 bytes when building via old .mak files,
for compatibility with older VC++.

Anyway, a /Zp8 flag should correct this.

Georg

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[Python-Dev] Who understands _ssl.c on Windows?