FreeCAD

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# ADAPTED FOR FREECAD FROM VTK'S vtkQt.cmake
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# ORIGINAL VTK COPYRIGHT NOTICE FOLLOWS (BSD 3-CLAUSE)
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#
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# /*=========================================================================
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#
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#   Program:   Visualization Toolkit
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#   Module:    Copyright.txt
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#
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# Copyright (c) 1993-2015 Ken Martin, Will Schroeder, Bill Lorensen
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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#  * Redistributions of source code must retain the above copyright notice,
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#    this list of conditions and the following disclaimer.
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#
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#  * Redistributions in binary form must reproduce the above copyright notice,
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#    this list of conditions and the following disclaimer in the documentation
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#    and/or other materials provided with the distribution.
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#
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#  * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
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#    of any contributors may be used to endorse or promote products derived
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#    from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# =========================================================================*/
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# FREECAD_QT_VERSION is used to choose between Qt5 and Qt6.
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# If it is set to Auto(default), FreeCAD finds and uses the
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# version installed on the system. If both versions are
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# found, Qt5 is preferred.
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# The output variable is FREECAD_QT_MAJOR_VERSION, which will be either 5 or 6
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macro(ChooseQtVersion)
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  set(freecad_supported_qt_versions "Auto" 5 6)
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  # The following `if` check can be removed once CMake 3.21 is required and
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  # the policy CMP0126 is set to NEW.
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  if (NOT DEFINED FREECAD_QT_VERSION)
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    set(FREECAD_QT_VERSION "Auto" CACHE
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      STRING "Expected Qt major version. Valid values are Auto, 5, 6.")
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    set_property(CACHE FREECAD_QT_VERSION PROPERTY STRINGS "${freecad_supported_qt_versions}")
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  endif()
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  if(FREECAD_LIBPACK_USE)
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    if (NOT Qt5_DIR OR Qt5_DIR STREQUAL "Qt5_DIR-NOTFOUND")
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        message(STATUS "Using Qt5 directory from LibPack in ${FREECAD_LIBPACK_DIR}/lib/cmake/Qt5")
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        set(Qt5_DIR ${FREECAD_LIBPACK_DIR}/lib/cmake/Qt5)
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    endif()
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  endif()
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  if (NOT FREECAD_QT_VERSION STREQUAL "Auto")
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    if (NOT FREECAD_QT_VERSION IN_LIST freecad_supported_qt_versions)
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      message(FATAL_ERROR
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        "Supported Qt versions are \"${freecad_supported_qt_versions}\". But "
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        "FREECAD_QT_VERSION is set to ${FREECAD_QT_VERSION}.")
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    endif ()
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    set(_FREECAD_QT_VERSION "${FREECAD_QT_VERSION}")
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  else ()
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    find_package(Qt5 QUIET COMPONENTS Core)
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    set(_FREECAD_QT_VERSION 5)
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    if (NOT Qt5_FOUND)
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      find_package(Qt6 QUIET COMPONENTS Core)
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      if (NOT Qt6_FOUND)
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        message(FATAL_ERROR
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          "Could not find a valid Qt installation. Consider setting Qt5_DIR or Qt6_DIR (as needed).")
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      endif ()
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      set(_FREECAD_QT_VERSION 6)
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    endif ()
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  endif ()
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  set(FREECAD_QT_MAJOR_VERSION "${_FREECAD_QT_VERSION}" CACHE INTERNAL
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    "Major version number for the Qt installation used.")
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  message(STATUS  "Compiling with Qt ${FREECAD_QT_MAJOR_VERSION}")
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endmacro()