[CMake] [Insight-developers] 64 bit build detection

[David Cole]

TRY_COMPILE works fine for cross compiles, just not for *mutiple
configs/architectures "simultaneously"* compiles...


On Thu, Jun 11, 2009 at 3:41 PM, Sean McBride <sean at rogue-research.com>wrote:

> On 6/11/09 3:00 PM, Michael Jackson said:
>
> >-- CMAKE_SIZEOF_VOID_P: 4  <============ THIS IS WRONG FOR X64 builds
>
> Yeah, but gcc on 10.5 and earlier defaults to building 32 bit.  If you
> want 64 bit you need to pass '-arch x86_64' (or ppc64).  Or in the case
> of CMake, use CMAKE_OSX_ARCHITECTURES (or whatever its called).
>
> But if you use multiple architectures, like i386 _and_ x86_64, then each
> arch can and does have a different size void*.  Now sure what CMake does
> there, hopefully warns or errors.
>
> Always best to avoid TRY_RUNs and I guess TRY_COMPILES too for Universal
> Binaries/cross compilation.
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng                 sean at rogue-research.com
> Rogue Research                        www.rogue-research.com
> Mac Software Developer              Montréal, Québec, Canada
>
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