[vtkusers] VTK and QT tested on Mac

[Alain CORON]

"Bert Schiettecatte" <bert.schiettecatte at esat.kuleuven.ac.be> writes:

> Hi Carsten,
> 
> I tried downloading the qmake version of the library (used on macos X
> normally) and I changed the qmake project file to work on my win xp with
> vtk 4.2 and qt 3.1.1. When I try to compile the library using MS VC .
> NET 2002 I get the following warnings:
> 
> vtkQGLLight.cxx(35) : warning C4273: 'vtkQGLLight::CollectRevisions' :
> inconsistent dll linkage
> vtkQGLLight.cxx(36) : warning C4273: 'vtkQGLLight::New' : inconsistent
> dll linkage
> vtkQGLLight.cxx(41) : warning C4273: 'vtkQGLLight::Render' :
> inconsistent dll linkage
> 
> when I try to compile the cylinder example I get 
> 
> cylinder_vtkqt error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: static class vtkQGLLight * __cdecl
> vtkQGLLight::New(void)" (__imp_?New at vtkQGLLight@@SAPAV1 at XZ) referenced
> in function "protected: virtual class vtkObject * __thiscall
> vtkQtObjectFactory::CreateObject(char const *)"
> (?CreateObject at vtkQtObjectFactory@@MAEPAVvtkObject@@PBD at Z)
> 
> Anybody have any idea what the problem could be? 

Hello,

Have a look at vtkQGLLight.h line 30, you will see

class VTK_RENDERING_EXPORT vtkQGLLight : public vtkOpenGLLight

The macro VTK_RENDERING_EXPORT is a Windows specific macro defined in
vtkWin32Header.h by

     #if defined(vtkRendering_EXPORTS)
      #define VTK_RENDERING_EXPORT __declspec( dllexport ) 
     #else
      #define VTK_RENDERING_EXPORT __declspec( dllimport ) 
     #endif

On the other system it expands to nothing.

On Windows you must explicitly export the classes and the global functions
which you want to be publicly accessible.  So if vtkRendering_EXPORTS is
defined, then you explicitly export vtkQGLLight.  Otherwise you don't.

It seems that your CMake does not define this macro.  

However I think that it should be better if vtk_qt use its own macro to
export its own classes and functions.  This macro should also be added to the
other classes.

Bye.
-- 
Alain CORON            mailto:alain.coron at lip.bhdc.jussieu.fr
Laboratoire d'Imagerie Paramétrique - UMR CNRS 7623
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