When using Win32/x86 in a version block is that the compiler or OS?

[John Colvin]

On Sunday, 12 January 2014 at 18:47:43 UTC, Gary Willoughby wrote:
> When using Win32/x86 in a version block, does that relate to 
> the compiler or OS?
>
> for example:
>
> version(Win32)
> {
>     // 32bit Windows or 32bit Compiler?
> }
>
> version(X86)
> {
>     // 32bit OS or 32bit Compiler?
> }
>
> If these don't relate to the compiler is there any indication 
> that the program is being compiled with a 32bit compiler?
>
> I'm primarily asking because i need to use this to constrain 
> dub to build different things depending on what compiler is 
> used and on what architecture.

version arguments are for the target architecture, not the 
compiler/build-environment.