will code in a 32-bit OS VM running on a 64-bit host machine compile/debug to IA-32 or IA-64 code?

I have a laptop with an intel i3 processor running windows 7 64-bit.

I am wondering, can I set up a VM running, say, windows XP 32-bit, and be able to code targeting the intel 32 architecture? will my开发者_运维知识库 code compile, run, debug, the same way it would on a native 32bit machine?

thanks!

If the processor isn't buggy, and the WoW64 layer is working correctly, then your 32-bit code will work pretty much the same on your 64-bit OS. No need for a VM.

If you cross-compile it in the 64bit OS then yes it will run in the 32bit OS just fine, you could also simply compile it in the 32bit OS and that would work too.

If you open your project's configuration manager you can compile for a target of Win32 or x64, regardless of which OS you're using for Visual Studio. If you didn't select the necessary compilers when you installed Visual Studio or an SDK, you'll have to install them now.

As a separate issue, whatever OS you install in a VM, when you run in that VM you're running in that OS. You can install multiple OSes into a single VM too, one OS per partition in your virtual disk drive(s), the same as on a real PC.

The 64 bit instruction set used in i7, Core 2 etc, is not IA64, its called AMD64, or x86-64. IA64 is used in Itanium server processors. As for the answer, you don't need to specifically set a VM to run/code/compile 32 bit apps. You can do that on 64 bit machine too. All this can be done just as you would on a 64 bit machine by checking the appropriate options in VS.