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# VTK_QT_VERSION is used to choose between Qt5 and Qt6.
# If it is set to Auto(default), VTK finds and uses the
# version installed on the system. If both versions are
# found, Qt6 is preferred.
set(vtk_supported_qt_versions "Auto" 5 6)
# The following `if` check can be removed once CMake 3.21 is required and
# the policy CMP0126 is set to NEW for ParaView and other superbuilds.
if (NOT DEFINED VTK_QT_VERSION)
set(VTK_QT_VERSION "Auto" CACHE
STRING "Expected Qt major version. Valid values are Auto, 5, 6.")
set_property(CACHE VTK_QT_VERSION PROPERTY STRINGS "${vtk_supported_qt_versions}")
endif()
if (NOT VTK_QT_VERSION STREQUAL "Auto")
if (NOT VTK_QT_VERSION IN_LIST vtk_supported_qt_versions)
message(FATAL_ERROR
"Supported Qt versions are \"${vtk_supported_qt_versions}\". But "
"VTK_QT_VERSION is set to ${VTK_QT_VERSION}.")
endif ()
set(_vtk_qt_version "${VTK_QT_VERSION}")
else ()
find_package(Qt6 QUIET COMPONENTS Core)
set(_vtk_qt_version 6)
if (NOT Qt6_FOUND)
find_package(Qt5 QUIET COMPONENTS Core)
if (NOT Qt5_FOUND)
message(FATAL_ERROR
"Could not find a valid Qt installation.")
endif ()
set(_vtk_qt_version 5)
endif ()
endif ()
set(vtk_qt_major_version "${_vtk_qt_version}" CACHE INTERNAL
"Major version number for the Qt installation used.")
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