[CMake] Detecting 32/64 bit systems

[Ryan Pavlik]

Yep CMAKE_SIZEOF_VOID_P will be 4 if you've chosen a generator like "Visual
Studio 9.0 2008", and 8 if you've chosen "Visual Studio 9.0 2008 Win64"

Ryan

On Sat, Feb 12, 2011 at 11:41 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> Quite right.
>
> So you claim that on Windows CMAKE_SIZEOF_VOID will tell me the
> *target* build system, not the physical one, while it will mach
> CMAKE_SYSTEM_PROCESSOR if the both are the same?
>
> Many thanks for the clarification.
>
> Dominik
>
> On Sat, Feb 12, 2011 at 6:34 PM, Ryan Pavlik <rpavlik at iastate.edu> wrote:
> > CMAKE_SIZEOF_VOID_P will tell you the difference between target
> bit-widths:
> > 8 (for 64 bit) vs 4 (for 32 bit) - remember that just because you're
> running
> > on a 64-bit system doesn't mean you're compiling a 64-bit binary.
> > Ryan
> >
> > On Sat, Feb 12, 2011 at 11:29 AM, Dominik Szczerba <dominik at itis.ethz.ch
> >
> > wrote:
> >>
> >> OK, got it experimentally. You have
> >>
> >> CMAKE_SYSTEM_PROCESSOR
> >>
> >> But wait, is the description below correct?
> >>
> >> http://www.cmake.org/Wiki/CMake_Useful_Variables
> >>
> >> Opposed to the explanations there, which I saw, but took as not what I
> >> need, on my systems it amounts to i686 and x86_64, exactly what I
> >> need.
> >>
> >> Dominik
> >>
> >> On Sat, Feb 12, 2011 at 6:19 PM, Dominik Szczerba <dominik at itis.ethz.ch
> >
> >> wrote:
> >> > Hi,
> >> >
> >> > I can't really find a clear solution in google: how would one go about
> >> > detecting if the system is 32 or 64 bit? There are UNIX, WIN32 etc.
> >> > flags, but nothing really for the architecture.
> >> >
> >> > Thanks a lot,
> >> > Dominik
> >> >
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> >
> > --
> > Ryan Pavlik
> > HCI Graduate Student
> > Virtual Reality Applications Center
> > Iowa State University
> >
> > rpavlik at iastate.edu
> > http://academic.cleardefinition.com
> > Internal VRAC/HCI Site: http://tinyurl.com/rpavlik
> >
>



-- 
Ryan Pavlik
HCI Graduate Student
Virtual Reality Applications Center
Iowa State University

rpavlik at iastate.edu
http://academic.cleardefinition.com
Internal VRAC/HCI Site: http://tinyurl.com/rpavlik
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