[ITK-dev] ITK 4.8, castxml, and 32-bits Debian/gcc

[Steve M. Robbins]

Thanks, Brad!

On Monday, September 21, 2015 11:42:20 AM Brad King wrote:
> On 09/20/2015 11:03 PM, Steve M. Robbins wrote:


> > Secondly, I am slightly surprised that ITK should even need to
> > guard against including things when __GCCXML __ is defined.
> > I had naively assumed that gccxml should be seeing the same
> > code as the regular parser.  Is this a work-around for some
> > gccxml issues of the past or is it still needed?
> 
> It was a workaround for gccxml because its parser was hard-coded
> to a specific architecture and had no way to simulate the
> intrinsics of other architectures.  This should not be necessary
> for CastXML because it really invokes its Clang compiler with
> the proper target architecture.

OK.  But later Matt McCormick replied with a patch that essentially changes 
__GCCXML__ to CABLE_CONFIGURATION which is defined during the build.  That 
change seems to imply that the workaround is still required.  (?)



> I think the problem here is that CastXML needs to know when
> to enable SSE as part of its target architecture configuration.
> One could do that explicitly by adding '-msse' to the castxml
> command-line right now.  That may get your build going.

OK.  So I'm well out of my depth with SSE, but: since the build is targeting 
i386, I think there would not be SSE support.  Another data point is that the 
cmake configuration step outputs:

-- Performing Test VXL_HAS_SSE2_HARDWARE_SUPPORT
-- Performing Try-Run Test VXL_HAS_SSE2_HARDWARE_SUPPORT - Test Compilation 
Failed
-- Performing Test VXL_SSE2_HARDWARE_SUPPORT_POSSIBLE
-- Performing Test VXL_SSE2_HARDWARE_SUPPORT_POSSIBLE - Success

... and ...

-- Performing Test ITK_COMPILER_SUPPORTS_SSE2_64
-- Performing Test ITK_COMPILER_SUPPORTS_SSE2_64 - Failed
-- Performing Test ITK_COMPILER_SUPPORTS_SSE2_32
-- Performing Test ITK_COMPILER_SUPPORTS_SSE2_32 - Failed
-- Performing Test ITK_COMPILER_DOES_NOT_NEED_MSSE2_FLAG
-- Performing Test ITK_COMPILER_DOES_NOT_NEED_MSSE2_FLAG - Failed

I'll take a closer look at these tonight.

-Steve
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