[Ctk-developers] Link error with CTK and VTK

[Quentan Qi]

Hi Jean,

Thanks a lot for your detailed explanation!

I recompiled CTK using the latest VTK 6.2.0 and it works well. No glitch complains from that example any more. 

But the Qt widgets `ctkVTKRenderView` and `ctkVTKSliceView`, which come from library file `Qt\plugin\designer\libCTKVisualizationVTKWidgetsPlugins.so`,  fail to work and crash Qt Designer. All the other widgets work correctly. This may not be a serious problem.

I’m now running on OS X 10.10 with VTK 6.2.0 and Qt 4.8.6. I also wonder when CTK can work with Qt 5, because VTK is quite compatible with it but I failed to compile CTK with VTK 6.2.0 bundled with Qt 5.2.1.

My current cmake option is:

```
cmake -DCMAKE_BUILD_TYPE:STRING=Release -DCTK_ENABLE_Widgets:BOOL=ON -DCTK_LIB_Visualization/VTK/Widgets:BOOL=ON -DVTK_DIR:PATH=/usr/local/vtk/lib/cmake/vtk-6.2 ../CTKSource
```

Qt’s path can be found by cmake automatically.

Cheers,
Quentan


> On 26 Mar 2015, at 04:30, Jean-Christophe Fillion-Robin <jchris.fillionr at kitware.com> wrote:
> 
> Hi Quentan, 
> 
> You are welcome !
> 
> I just fixed an issue preventing the Examples from being configured with the latest version of the CTK source. The fix has now been integrated. See [1]
> 
> Few comments regarding the CMakeLists.txt you pasted above:
> 
>   1: It should be "find_package(Qt4 REQUIRED)" instead of "find_package(QT4 REQUIRED)"
> 
>   2: Since CTKConfig.cmake already define "VTK_DIR" and "QT_QMAKE_EXECUTABLE",  you could simply the configuration of your project by including VTK and Qt after CTK.
> 
> That way configuring your project would be as simple as:
> 
>   cd TEST_CTK-build
>   cmake -DCTK_DIR:PATH=/path/to/CTK-build ../CTK_TEST
> 
> 
> All of that said, I wasn't able to reproduce your problem.
> 
> Few questions:
> 
>   a) Did you build VTK yourself or let the CTK superbuild taking care of it ?
> 
>   b) How did you configure CTK ? Which configure option ? On my side I used the option detailed in [2]. Since I add already a build of VTK available, I re-used it.
> 
> 
> Hth
> Jc
> 
> [1] https://github.com/commontk/CTK/commit/aee6addc33d5596026c0d47c8793270e91a95a2a <https://github.com/commontk/CTK/commit/aee6addc33d5596026c0d47c8793270e91a95a2a>
> 
> [2] cmake -DQT_QMAKE_EXECUTABLE:FILEPATH=/home/jcfr/Support/qt-everywhere-opensource-release-build-4.8.6/bin/qmake -DVTK_DIR:PATH=/home/jcfr/Projects/Slicer-Debug/VTKv6-build/ -DCTK_ENABLE_Widgets:BOOL=1 -DCTK_LIB_Visualization/VTK/Widgets:BOOL=1 -DBUILD_TESTING:BOOL=0 ../CTK
> 
> 
> On Mon, Mar 16, 2015 at 4:22 PM, Quentan Qi <quentan at gmail.com <mailto:quentan at gmail.com>> wrote:
> Dear community members,
> 
> I am new with CTK, and want to use the CTK-VTK widget with Qt. The example <https://github.com/commontk/Examples> from the website works, but once VTK is added, a link error occurs, even though the cpp file has no change. I am quite confused about it, and want to find a solution.
> 
> * `CMakeLists.txt`
> 
> ```
> cmake_minimum_required(VERSION 2.8)
> project(TEST_CTK)
> 
> find_package(VTK REQUIRED)
> include(${VTK_USE_FILE})
> 
> find_package(CTK REQUIRED)
> include(${CTK_USE_FILE})
> 
> find_package(QT4 REQUIRED)
> include(${QT_USE_FILE})
> 
> set(SOURCE_FILES main.cpp)
> add_executable(TEST_CTK ${SOURCE_FILES})
> target_link_libraries(${PROJECT_NAME} ${CTK_LIBRARIES})
> ```
> 
> * Error information
> 
> ```
> Scanning dependencies of target TEST_CTK
> Linking CXX executable TEST_CTK
> ld: library not found for -lvtkCommon
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> CMakeFiles/TEST_CTK.dir/build.make:90: recipe for target 'TEST_CTK' failed
> gmake[3]: *** [TEST_CTK] Error 1
> CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/TEST_CTK.dir/all' failed
> gmake[2]: *** [CMakeFiles/TEST_CTK.dir/all] Error 2
> CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/TEST_CTK.dir/rule' failed
> gmake[1]: *** [CMakeFiles/TEST_CTK.dir/rule] Error 2
> Makefile:110: recipe for target 'TEST_CTK' failed
> gmake: *** [TEST_CTK] Error 2
> ```
> 
> * Environment: OS X 10.10 
> 
> Thank you very much!
> 
> Regards,
> Quentan
> 
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