# Undefined references to \`CamAdaptor\` when building \`libvtkPVAdaptorsCam\`

**URL:** https://discourse.paraview.org/t/undefined-references-to-camadaptor-when-building-libvtkpvadaptorscam/6460
**Category:** ParaView Support
**Created:** [February 13, 2021, 6:15pm UTC](https://discourse.paraview.org/t/undefined-references-to-camadaptor-when-building-libvtkpvadaptorscam/6460 "2021-02-13T18:15:35Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![badshah400](https://discourse.paraview.org/user_avatar/discourse.paraview.org/badshah400/32/5901_2.png) [@badshah400](https://discourse.paraview.org/u/badshah400)
#### Post date: [February 13, 2021, 6:15pm UTC](https://discourse.paraview.org/t/undefined-references-to-camadaptor-when-building-libvtkpvadaptorscam/6460/1 "2021-02-13T18:15:35Z")

</div>

When building `libvtkPVAdaptorsCam`, multiple undefined references to `CamAdaptor` causes the build to fail. This is when building packages for openSUSE, where the default linker flags include `-Wl,--as-needed -Wl,--no-undefined`. Any help with this would be appreciated. If I should open an issue on paraview’s gitlab repo, please let me know.

From the build log:

```nohighlight
[503s] [18341/18802] : && /var/lib/build/ccache/bin/c++ -fPIC -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -ffat-lto-objects -g -DNDEBUG -O2 -g -DNDEBUG -Wl,-lc -flto=auto -ffat-lto-objects -Wl,--as-needed -Wl,--no-undefined -Wl,-z,now -shared -Wl,-soname,libvtkPVAdaptorsCam-pv5.9.so.1 -o lib64/libvtkPVAdaptorsCam-pv5.9.so.5.9 Adaptors/Cam/CMakeFiles/AdaptorsCam.dir/fv_create_data.cxx.o Adaptors/Cam/CMakeFiles/AdaptorsCam.dir/se_create_data.cxx.o -Wl,-rpath,/home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/lib64: lib64/libvtkPVPythonCatalyst-pv5.9.so.5.9 lib64/libvtkPVCatalyst-pv5.9.so.5.9 lib64/libvtkPythonInterpreter-pv5.9.so.5.9 /usr/lib64/libpython3.8.so lib64/libvtkCommonDataModel-pv5.9.so.5.9 lib64/libvtkCommonTransforms-pv5.9.so.5.9 lib64/libvtkCommonMath-pv5.9.so.5.9 lib64/libvtkCommonCore-pv5.9.so.5.9 -lpthread lib64/libvtksys-pv5.9.so.5.9 -ldl -Wl,-rpath-link,/home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/lib64 && :
[503s] FAILED: lib64/libvtkPVAdaptorsCam-pv5.9.so.5.9 
[503s] : && /var/lib/build/ccache/bin/c++ -fPIC -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -ffat-lto-objects -g -DNDEBUG -O2 -g -DNDEBUG -Wl,-lc -flto=auto -ffat-lto-objects -Wl,--as-needed -Wl,--no-undefined -Wl,-z,now -shared -Wl,-soname,libvtkPVAdaptorsCam-pv5.9.so.1 -o lib64/libvtkPVAdaptorsCam-pv5.9.so.5.9 Adaptors/Cam/CMakeFiles/AdaptorsCam.dir/fv_create_data.cxx.o Adaptors/Cam/CMakeFiles/AdaptorsCam.dir/se_create_data.cxx.o -Wl,-rpath,/home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/lib64: lib64/libvtkPVPythonCatalyst-pv5.9.so.5.9 lib64/libvtkPVCatalyst-pv5.9.so.5.9 lib64/libvtkPythonInterpreter-pv5.9.so.5.9 /usr/lib64/libpython3.8.so lib64/libvtkCommonDataModel-pv5.9.so.5.9 lib64/libvtkCommonTransforms-pv5.9.so.5.9 lib64/libvtkCommonMath-pv5.9.so.5.9 lib64/libvtkCommonCore-pv5.9.so.5.9 -lpthread lib64/libvtksys-pv5.9.so.5.9 -ldl -Wl,-rpath-link,/home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/lib64 && :
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `fv_add_chunk_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:152: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::AddPointsAndCells(double, double)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:156: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::AddPointsAndCells(double, double)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:164: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::SetAttributeValue(int, double*, double*, double*, double*, double*, double*)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `fv_catalyst_finalize_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:43: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o:/home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:47: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `se_add_chunk_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:131: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::AddPointsAndCells(double, double)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `se_catalyst_finalize_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:46: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `fv_create_grid_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:101: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:110: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::Create()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:111: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:117: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:121: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:130: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::Create()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:131: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:137: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:113: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)0>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:133: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `se_create_grid_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:99: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:104: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::SetCubeGridPoints(int, int, int, double*, int, double*)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:106: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::Create()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:107: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:113: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::~Grid()'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:109: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::SetToCoprocessor(vtkCPDataDescription*, char const*, vtkSmartPointer<vtkUnstructuredGrid>)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `fv_add_chunk_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/fv_create_data.cxx:168: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)1>::SetAttributeValue(int, double*, double*, double*, double*, double*, double*)'
[503s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: /tmp/libvtkPVAdaptorsCam-pv5.9.so.5.9.pTk7EP.ltrans0.ltrans.o: in function `se_add_chunk_':
[503s] /home/abuild/rpmbuild/BUILD/ParaView-v5.9.0/build/../Adaptors/Cam/se_create_data.cxx:137: undefined reference to `CamAdaptor::Grid<(CamAdaptor::GridType)2>::SetAttributeValue(int, double*, double*, double*, double*, double*, double*)'
[503s] collect2: error: ld returned 1 exit status

```

---

<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [February 15, 2021, 3:18pm UTC](https://discourse.paraview.org/t/undefined-references-to-camadaptor-when-building-libvtkpvadaptorscam/6460/2 "2021-02-15T15:18:53Z")

</div>

`CamAdaptor::Grid` is a template class, so these files should be instantiating things as needed. However, the source files don’t include the `.txx` file.

Does [this MR](https://gitlab.kitware.com/paraview/paraview/-/merge_requests/4729) fix things?

---

<div class="post-metadata">

### Author: ![badshah400](https://discourse.paraview.org/user_avatar/discourse.paraview.org/badshah400/32/5901_2.png) [@badshah400](https://discourse.paraview.org/u/badshah400)
#### Post date: [February 15, 2021, 5:35pm UTC](https://discourse.paraview.org/t/undefined-references-to-camadaptor-when-building-libvtkpvadaptorscam/6460/3 "2021-02-15T17:35:31Z")

</div>

Many thanks, that does the trick. Solved!