[Python-Dev] mingw32 and gc-header weirdness

["Martin v. Löwis"]

> For that reason, I don't like the addition of the opaque header
> too much. If there were an option to make the header explicit,
> we would not have to round up the object size to a multiple
> of (8, 16), but could arrange embedded doubles as they fit the best.

We could add the gc head *after* the object head. However, this will
require manual changes to all types that support GC, so we can't do
that before Python 4.

>> (I disagree, however, that we should remove the "long double". After
>> all, we
>> also want alignment of PyObjects to allow inclusion of a "long double"
>> in them)
> 
> Well, I doubt that a 12 byte long double causes any other
> alignment but 4.

What you apparently fail to understand is this: On some platforms,
sizeof(long double) == 16, and alignof(long double) == 16. It is these
platforms why we need to keep the long double.

Regards,
Martin