Deploying 64bit on 32bit OS

[M.]

Is it posible to compile Qt application on Windows XP which will run on Windows Vista 64 bit or Windows 7 64bit? I am using Visual Studio 2008 with Qt add-in and Qt 4.5.3 .

[scascio]

Your question gives me trouble according to the title of your thread.

Anyway, you can compile on a 64bits machine with the right compile option (-m32 for gcc) to generate an executable that will run on 32 bits machine.

[ChrisW67]

The Microsoft compiler suite should be able to build 64-bit executables on a 32-bit machine but I gather you would first have to build Qt from source using the 64-bit compiler options and then build your project in that environment.

Of course, you will not be able to test, deploy or run the resulting 64-bit executable on your 32-bit machine (which is what your title implies you want).

[M.]

The Microsoft compiler suite should be able to build 64-bit executables on a 32-bit machine but I gather you would first have to build Qt from source using the 64-bit compiler options and then build your project in that environment.

Of course, you will not be able to test, deploy or run the resulting 64-bit executable on your 32-bit machine (which is what your title implies you want).

And could you share those compiler options?

[ChrisW67]

I don't have a full blown VS install, only the Microsoft SDK 6.1 in a 32-bit environment. This seems to do the trick from the Microsoft SDK command prompt:

C:\TEMP>vcvarsx86_amd64.bat
Setting environment for using Microsoft Visual Studio 2008 Beta2 x64 cross tools
.
 
C:\TEMP>cl  main.c
Microsoft (R) C/C++ Optimizing Compiler Version 15.00.21022.08 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.
 
main.c
Microsoft (R) Incremental Linker Version 9.00.21022.08
Copyright (C) Microsoft Corporation.  All rights reserved.
 
/out:main.exe
main.obj
 
C:\TEMP>

C:\TEMP>vcvarsx86_amd64.bat
Setting environment for using Microsoft Visual Studio 2008 Beta2 x64 cross tools
.

C:\TEMP>cl  main.c
Microsoft (R) C/C++ Optimizing Compiler Version 15.00.21022.08 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

main.c
Microsoft (R) Incremental Linker Version 9.00.21022.08
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:main.exe
main.obj

C:\TEMP>

To copy to clipboard, switch view to plain text mode 

The resulting main.exe cannot run on this machine. The batch file (you'd have to dissect yours) tweaks the LIB, LIBPATH, and PATH variables to put the 64-bit cross-compiler and 64-bit libraries in the mix before any others.

I did think the compiler had a "/MACHINE" option to set the target but that appears to be wrong.

[yodasoda]

how do you delete a post

[yodasoda]

Your question gives me trouble according to the title of your thread.

Anyway, you can compile on a 64bits machine with the right compile option (-m32 for gcc) to generate an executable that will run on 32 bits machine.

Default Re: Deploying 64bit on 32bit OS

what about the dynamic libs though, the application I am building comes with its own qtlibs but since my platform is 64 bits, do I need to provide different libs as well to run on a 32 bit platform?

[squidge]

Well yes, your 64-bit libraries will not work in a 32-bit environment, just like your code.