[Vm-dev] Re: [Poll] Who is interested in, thinking about, or already contributing to a 64-bit OpenSmalltalk VM for Windows?

[Nicolas Cellier]

2016-07-06 4:04 GMT+02:00 Eliot Miranda <eliot.miranda at gmail.com>:

>
> Hi All,
>
> On Tue, Jul 5, 2016 at 8:06 AM, Nicolas Cellier <
> nicolas.cellier.aka.nice at gmail.com> wrote:
>
>>
>>
>> 2016-07-05 15:40 GMT+02:00 marcel.taeumel <Marcel.Taeumel at hpi.de>:
>>
>>>
>>> >>
>>> >> --
>>> >> View this message in context:
>>> >>
>>> http://forum.world.st/Poll-Who-is-interested-in-thinking-about-or-already-contributing-to-a-64-bit-OpenSmalltalk-VM-for-Wi-tp4904953.html
>>> >> Sent from the Squeak VM mailing list archive at Nabble.com.
>>> >>
>>>
>>> Hi Nicolas,
>>>
>>>
>> Hi Marcel,
>>
>>
>>> if we target Cygwin as a build environment, this might be worth noticing:
>>> https://cygwin.com/faq.html#faq.programming.64bitporting
>>>
>>>
>> As currently generated, the Spur Vm for 64 bits expects sizeof(long) == 8.
>> So it is cygwin64 x86_64 compatible, but not so much MSVC... (or
>> mingw-w64 variants...)
>> IMO, this is the easiest target. then we could inquire about alternate
>> compilers.
>>
>
> This is great to hear.  So there is a model where sizeof(long) == 8?  If
> that's so, we should target it.  There's a /lot/ of work to do if we have
> to support the Win64 sizeof(long) == 4 model.
>
snip...

After inquiring a bit more, that's not going to be that easy...
Yes, x86_64-pc-cygwin-gcc.exe is LP64 and Spur64 compatible, but it lacks
all the interfaces used by platforms/win32 (like _fmode _O_BINARY etc...)
On the other hand, x86_64-w64-mingw32-gcc.exe has all the required win32
interfaces but is thus LLP64.

Thus, either we use cygwin, switch to a unix architecture, and loose a
bunch of win32 specific features (Direct3D etc...). But how to provide the
interface to window manager/GUI?
Or we take the longer path to get VMMaker work on LLP64 (sizeof long == 4,
sizeof(long) < sizeof(char *)).

Nicolas
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