Hello,

I have recently added needed standard export specification to the explicitly 
instantiated ParametricPath class [1] to address many compilation errors [2] 
with standard shared library configuration with MSCV. The linker errors had the 
following form:

ITKPath-4.11.lib(ITKPath-4.11.dll) : error LNK2005: "public: virtual void 
__cdecl itk::ParametricPath<2>::SetDefaultInputStepSize(double)" 
(?SetDefaultInputStepSize@?$ParametricPath@$01@itk@@UEAAXN@Z) already defined 
in itkPathIteratorTest.obj 
[C:\d\itk-vs11-64rs\ITK-build\Modules\Filtering\Path\test\ITKPathTestDriver.vcxproj]


The patch successfully address the problem with “normal” shared libraries. Now 
a new linker error [3] has popped up with the CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS 
option enabled with just one MSVC compiler vs12:

itkPolylineMask2DImageFilterTest.cxx.obj : error LNK2019: unresolved external 
symbol "__declspec(dllimport) const itk::Path,2>::`vftable'" 
(__imp_??_7?$Path@NV?$ContinuousIndex@N$01@itk@@$01@itk@@6B@) referenced in 
function "protected: virtual __cdecl 
itk::PolyLineParametricPath<2>::~PolyLineParametricPath<2>(void)" 
(??1?$PolyLineParametricPath@$01@itk@@MEAA@XZ)

It is important to note that the missing Path symbol is the parent class of the 
explicitly instantiated and exported ParametricPath class. 

So who wants to take up this issue?

Thanks,
Brad

[1] 
https://github.com/InsightSoftwareConsortium/ITK/compare/7ed1d9b058715f00a08ecac8cbc1498728296d57...0aa2e6fe7411c46ec21c27cbcde8eb42f4cdc4b4
[2] https://open.cdash.org/viewBuildError.php?buildid=4657350
[3] https://open.cdash.org/viewBuildError.php?buildid=4661233
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