[Insight-developers] Compiling with c++0x patch

[Bradley Lowekamp]

Hello David,


Did you run into this problem when you build ITK with this flag or when this flag was added to an application which uses ITK?

I believe there is a try compile for usage of this feature in VXL, so if you compile both your application and ITK with this flag it may work?

Brad

On Dec 28, 2011, at 8:40 PM, David Doria wrote:

> If I enable the c++0x flag, I get lots of "error: ‘constexpr’ needed
> for in-class initialization of static data member ‘float_sqrteps’ of
> non-integral type" errors in vxl/core/vnl/vnl_numeric_traits.h and
> vnl_math.h. It seems like float in-class initialization are deprecated by gcc
> (the last item here:http://gcc.gnu.org/onlinedocs/gcc/Deprecated-Features.html)
> 
> Moving these initialization outside of the class body fixes the errors.
> 
> http://review.source.kitware.com/#/c/3583/
> 
> It didn't seem to me like the VCL_STATIC_CONST_INIT_FLOAT_DECL macro
> was doing anything, and it wouldn't compile with it once I moved the
> initializations, but it seems to compile and work fine at least on
> gcc.
> 
> What is the procedure for pushing this upstream if it seems
> reasonable? I really think we should allow code that uses ITK to use
> c++0x.
> 
> David
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========================================================
Bradley Lowekamp  
Medical Science and Computing for
Office of High Performance Computing and Communications
National Library of Medicine 
blowekamp at mail.nih.gov



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