[Insight-users] x64 and x86

[Gib Bogle]

Hi Robert,

The MinGW64 toolset is:

=== TDM-GCC Compiler Suite for Windows ===
---           GCC 4.5 Series           ---
***    MinGW-w64 64/32-bit Edition     ***

This edition of TDM-GCC is a multilib bootstrap of GCC's x86_64-w64-mingw32
target, built to run on 32-bit or 64-bit Windows and generate binaries for
32-bit or 64-bit Windows.

It seems to have been released about 5/2010.  Although my programs are  
using x86 Windows DLLs with '32' in the name, they seem to run OK  
using more than 4GB of memory.

I don't understand the situation with the Windows DLLs.  For example,  
I see that there are two files kernel32.dll, with different sizes, one  
in windows\system32, the other in windows\syswow64.  I saw an online  
post claiming that the files in system32 are actually 64-bit, on  
Windows 7.  Is it possible that Dependency Walker is giving wrong  
information?  As I understand it, mixing 32-bit and 64-bit code in a  
program is not possible, and my programs seem to run fine (so far).

Gib

Quoting Robert Haase <robert_haase at gmx.de>:

> Hi Gib,
>
> after your report, I checked my working x64-EXE. It is compiled on  
> WinXP x64 using VS2008 with dynamically linked ITK-DLL. I found that  
> all dependent Windows-DLLs are 64bit. But my Program is also using  
> 32-Bit DLLs (MSVCR90.DLL, MSVCP90.DLL, QTGUI4.DLL, QTCORE4.DLL). So  
> I don't think this is problematic. You might test your application  
> on x64 compatibility by allocating > 2GB of memory. This should work  
> if it is a valid Win x64 EXE and fail if it is not.
>
> By the way, where did you get the MinGW-64 compiler? Isn't that  
> sourceforge project in beta status without real progress for years?
>
> Regards,
> Robert
>
>
> -------- Original-Nachricht --------
>> Datum: Fri, 01 Apr 2011 13:52:12 +1300
>> Von: Gib Bogle <g.bogle at auckland.ac.nz>
>> An: "insight-users at itk.org" <insight-users at itk.org>
>> Betreff: [Insight-users] x64 and x86
>
>> I've built the static ITK libraries on 64-bit Windows 7, with MinGW, and
>> built
>> an application using these libraries.  When I look at the executable with
>> Dependency Walker it tells me that while the executable is x64, all the
>> Windows
>> DLLs (e.g. ADVAPI32, GDI32, KERNEL32, ...) are x86.  Should I care about
>> this?
>> If so, what's the proper way to build a fully x64 application?
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