VTK 8.90 missing vtkGUISupportQt_LOADED

Development
#1

I am building VTKExamples standalone and I have noticed that I am getting the message: “VTKWikiExamples: Not building Qt examples”

There is no variable vtkGUISupportQt_LOADED being set in the VTK build.
I changed VTK_GROUP_ENABLE_QT:WANT to VTK_GROUP_ENABLE_QT:YES and got the same result.

Has there been a name change for vtkGUISupportQt_LOADED?

Cc: @ben.boeckel @lorensen

#2

Andrew,

I think you need something like:

if (TARGET GUISupportQt)

Bill

#3

Andrew,

I updated the top level CMakeLists.txt file. I can’t get a clean Qt
build for VTK under the new module system. Can you see if this fixes
the qt issue?

Thanks,

Bill

#4

@bill From what I can see there is no longer a VTK_QT_VERSION variable:

vtkGUISupportQt_LOADED: 
We have GUISupportQt
VTK_VERSION: 8.90.0
VTK_QT_VERSION: 
VTKWikiExamples: Building Qt examples
CMake Error at /usr/local/share/cmake-3.13/Modules/FindQt4.cmake:1313 (message):
  Found unsuitable Qt version "5.12.0" from
  /home/amaclean/Qt/5.12.0/gcc_64/bin/qmake, this code requires Qt 4.x
Call Stack (most recent call first):
  CMakeLists.txt:150 (find_package)

I also built VTK with VTK_GROUP_ENABLE_QT:WANT and VTK_GROUP_ENABLE_QT:YES, VTK_QT_VERSION remains empty.

In looking at VTK/Examples/GUI/Qt only Qt 5.x seems to be supported.

#5

I don’t have Qt4 so I’m asking the question:

Does VTK 8.90 even build with Qt4?

If it doesn’t then I thought this would work in the top-level CMakeLists.txt file:

if(vtkGUISupportQt_LOADED OR TARGET VTK::GUISupportQt)
  message(STATUS "VTKWikiExamples: Building Qt examples")
  if (VTK_VERSION VERSION_LESS "8.90.0")
    if(${VTK_VERSION} VERSION_GREATER "6" AND VTK_QT_VERSION VERSION_GREATER "4")
      # Instruct CMake to run moc automatically when needed.
      set(CMAKE_AUTOMOC ON)
      # We have ui files, this will bring in the macro: qt5_wrap_ui
      find_package(Qt5Widgets REQUIRED QUIET)
    else()
      find_package(Qt4 REQUIRED)
      include(${QT_USE_FILE})
    endif()
  else()
     # Instruct CMake to run moc automatically when needed.
    set(CMAKE_AUTOMOC ON)
    set(CMAKE_AUTOUIC ON)
    find_package(Qt5Widgets REQUIRED QUIET)
  endif()
  add_subdirectory(src/Cxx/Qt)
else()
  message(STATUS "VTKWikiExamples: Not building Qt examples")
endif()
# Is git lfs installed?
file(READ "${WikiExamples_SOURCE_DIR}/src/Testing/Data/GitLfsInstalled" data)

However I get undefined reference tomain’` when building the Qt tests.

#6

Let’s drop qt4 in the examples.

#7

I agree, it’s pretty old.

#8

I’m assuming you will modify the VTKExample CMake files. Let me know when done and I’ll test using vtk 8.90 and vtk 8.2.

#9

I’ll rip out the qt4 stuff. I can’t test because I’m having trouble
building with qt on ubuntu and macos.

Bill

#10

@lorensen , I downloaded SideBySideRenderWindowsQt and got it building with a few modifications on Kubuntu. Here is the modifiedCMakeLists.txt (2.4 KB) file that works for VTK 8.90 and VTK 8.2, I also removed the deprecation warnings when using VTK 8.90. Knowing you, you may have already done this :grinning:, however, if you haven’t, you may be able to create a template for the Qt files from this.

1 Like
#11

Does VTK 8.90 even build with Qt4?

Qt4 support was removed prior to 8.2 (Nov 2017).

if (TARGET GUISupportQt)

This should be if (TARGET VTK::GUISupportQt). The unprefixed name is only valid in a build of VTK itself; the namespace version is available everywhere.

#12

Great! I’ll fix it.