unresolved external symbol "void __cdecl vtkRenderingVolume_AutoInit_Construct(void)"

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1

I am getting this error, vtk-9.5, static libs build with VS under WIndows10.

I googled the issue, AI suggested that VTK uses dynamic linking to link the rendering backend at runtime and with static linking that does not take place. It suggested I add these lines to the file where the rendering code is

#include <vtkAutoInit.h>

VTK_MODULE_INIT(vtkRenderingOpenGL2);

VTK_MODULE_INIT(vtkRenderingVolume);

I did and that did not work. The next thing was to add these preprocessor directives:

vtkRenderingOpenGL2_AUTOINIT=1(vtkRenderingGL2PSOpenGL2) vtkVolumeRenderingOpenGL2_AUTOINIT=1(vtkRenderingVolumeOpenGL2)

It did not work too.

Any ideas how to fix this issue?

2

Hi @jsemeda :waving_hand:. Could you please share the CMake flags used to build VTK? Also, the error is not visible in the original post. Could you please reshare?

3

I think your edits are in the right direction, but you also need to link to the targets involved in providing those factories. You’re probably missing a vtk_module_autoinit call in your CMake code.

4

How should I do that? Does attaching the cmake file here help?

The full error is :

error LNK2019: unresolved external symbol “void __cdecl vtkVolumeRenderingOpenGL2_AutoInit_Construct(void)” (?vtkVolumeRenderingOpenGL2_AutoInit_Construct@@YAXXZ) referenced in function “public: __cdecl `anonymous namespace’::vtkVolumeRenderingOpenGL2_ModuleInit::vtkVolumeRenderingOpenGL2_ModuleInit(void)” (??0vtkVolumeRenderingOpenGL2_ModuleInit@?A0x43c0deb8@@QEAA@XZ)

5

I added

# Enable auto-initialization for the target and modules

vtk_module_autoinit(

TARGETS MyVTKApp

MODULES ${VTK_LIBRARIES}

)

but it did not help. I tried replacing the ${VTK_LIBRARIES} with the missing module name from the error, vtkVolumeRenderingOpenGL2, but it gave an error in the cmake file.

6

I also tried

vtk_module_autoinit(
TARGETS dicom2meshlib
MODULES vtk::CommonCore
vtk::RenderingCore
vtk::RenderingOpenGL2
vtk::RenderingVolume
vtk::RenderingVolumeOpenGL2
vtk::InteractionStyle
)

did not work. I am following what is in the documentaion, but maybe the way I am listing the modules is not correct? Maybe the module names? although when I write this in the cmake file the autocomplete is listing these modules as written.

7

I’ve seen this in the past when devs try to write the module init themselves and fumble on the module names.

vtkVolumeRenderingOpenGL2_AUTOINIT=1(vtkRenderingVolumeOpenGL2)

You’ve transposed the module name. It should be vtkRenderingVolumeOpenGL2_AUTOINIT=... That might explain why you saw error LNK2019: unresolved external symbol “void __cdecl vtkVolumeRenderingOpenGL2_AutoInit_Construct.

When you tried autoinit, did you remove the manual module init and try again? Maybve stale VTK_AUTOINIT define in cache/add_definitions from incorrect build is being carried forward. Try to delete your build directory and re-configure from scratch using the autoinit.

What I can suggest to you is don’t hand-write VTK_MODULE_INIT / VTK_AUTOINIT defines. Let CMake do it. Call find_package with the components you need. They will be placed in VTK_LIBRARIES

# CMakeLists.txt
find_package(VTK REQUIRED COMPONENTS
  CommonCore
  InterationStyle
  RenderingCore
  RenderingVolume
  RenderingVolumeOpenGL2
  RenderingOpenGL2
)
target_link_libraries(dicom2meshlib PRIVATE ${VTK_LIBRARIES}) # needed
vtk_module_autoinit(TARGETS dicom2meshlib MODULES ${VTK_LIBRARIES}) # also needed