[CMake] cmake on Windows x64

[Clinton Stimpson]

On Monday, October 15, 2012 01:37:42 PM John Drescher wrote:
> > Having CMAKE_SYSTEM_PROCESSOR be "x86" for a 64-bit build is very
> > inconvenient when detecting machine-dependent compiler flags,
> > constructing directory names for outputs based on configuration,
> > configuring third party search directories, etc.  It's always possible to
> > work around (among other things, one can consult the generator string for
> > Visual Studio builds, though not for MinGW builds) but that doesn't mean
> > it shouldn't be better behaved - it's entirely reasonable to assume that
> > CMAKE_SYSTEM_PROCESSOR should be the target processor for the build,
> > especially so that you can have similar behavior on Windows, Linux, and
> > Mac.  Though as previously discussed I also have the opposite problem on
> > Linux when compiling for 32-bit CPU on 64-bit OS.
> I see. I have always compared the size of the pointer for this..
> 
> John

Same here,  I use CMAKE_CXX_SIZEOF_DATA_PTR if I need to know that info in a 
CMakeLists.txt file.

Clint