[ITK] [ITK-users] vnl_numeric_traits.h constexpr _aka_ ITK and C++11

[Pol Monsó Purtí]

Hello all,

Today I moved&updated the ITK directory so I had to rebuild everything. I
am compiling with -std=c++11

Misteriously, now I am getting the error

/Users/monso/code/ITK/Modules/ThirdParty/VNL/src/vxl/core/vnl/vnl_numeric_traits.h:437:68:
error: 'constexpr' needed for in-class initialization of static data member
'const long double vnl_numeric_traits<long double>::maxval' of non-integral
type [-fpermissive]
   static const long double maxval
VCL_STATIC_CONST_INIT_FLOAT_DECL(1.7976931348623157E+308);

which apparently it's a bug that was there around 2011. How come it came
back? Any ideas?

This is using the master branch of
https://github.com/InsightSoftwareConsortium/ITK.git

See http://public.kitware.com/pipermail/community/2013-December/004580.html

I am on OSX, using g++-mp-4.9

I tried setting the vcl_include_cxx_0x, same result.

I don't know how I fixed this or if I had the issue (I kind of recall
this), but it worked before. So I tried with ITK4.7.1 from the website,
same result.

Cheers,

Pol
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