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List:       mingw-users
Subject:    Re: [Mingw-users] compiling 64-bit programs
From:       "K. Frank" <kfrank29.c () gmail ! com>
Date:       2010-05-31 22:56:32
Message-ID: AANLkTils50kZDvvK8gawUzBOJMYbI4EzCUcTayLTD0RV () mail ! gmail ! com
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Hi Nate -

On Mon, May 31, 2010 at 4:26 PM, Botond Ballo <zeratul976@hotmail.com> wrote:
> Hello,
> 
> I just tested MinGW 4.5 on a computer running 64-bit Windows, and found that
> sizeof(void*) is still 4, instead of 8 which is what I would expect.

I believe that you are seeing MinGW produce a 32-bit windows executable,
and that this is expected.

I am running 32-bit MinGW on 64-bit windows 7.  When I run the various
MinGW tools they show up as 32-bit processes in Task Manager (i.e.,
"xyz.exe *32").  When I run a program that I built with MinGW, it also
shows up as a 32-bit process in Task Manager.

> Am I missing some option to compile the program as a 64-bit program?

I do not believe that the MinGW project supports 64 bits (yet).  So, no,
you can't feed some flag to 32-bit MinGW's gcc to tell it to produce 64-bit
code.  There is another project (unaffiliated, I believe) that has ported 64-bit
gcc and friends to windows, see:

   sourceforge.net/projects/mingw-w64/

(I think that there is also a separate mailing list for mingw-64.)

> On my 64-bit Linux machine, sizeof(void*) is 8 without adding any flags.

I'm not running linux, but I would guess that the gcc that comes with a
64-bit linux distribution runs both as a 64-bit process, and, by default,
produces 64-bit code.

> Thanks,
> Nate.

Good luck.

K. Frank

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