# VersionMacros

VTKExamples/Cxx/Utilities/VersionMacros

### Code

VersionMacros.cxx

    #include <vtkPolyData.h>
    #include <vtkVersion.h> // NOTE: without this include, the VTK_[]_VERSION are not defined!

    // These functions allow you to output the version defines at compile time
    #define STR(x) STR2(x)
    #define STR2(x) #x

    int main(int, char *[])
    {
      #if VTK_MAJOR_VERSION>5 || (VTK_MAJOR_VERSION==5 && VTK_MINOR_VERSION>4)
        #pragma message(STR(VTK_MAJOR_VERSION))
      #endif

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(VersionMacros)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel QUIET)
    if (NOT VTK_FOUND)
      message("Skipping VersionMacros: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(VersionMacros MACOSX_BUNDLE VersionMacros.cxx )
      target_link_libraries(VersionMacros PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(VersionMacros MACOSX_BUNDLE VersionMacros.cxx )
      target_link_libraries(VersionMacros PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS VersionMacros
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build VersionMacros

Click here to download VersionMacros and its CMakeLists.txt file. Once the tarball VersionMacros.tar has been downloaded and extracted,

    cd VersionMacros/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./VersionMacros

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.