Use lowercase string for internal cmake variable name

CMake/vtk-config.cmake.in

@@ -142,8 +142,8 @@ if (TARGET VTK::opengl)
   set(VTK_OPENGL_HAS_EGL "@VTK_OPENGL_HAS_EGL@")
 endif ()
 
-if(@VTK_QT_MAJOR_VERSION@) # VTK_QT_VERSION
-  set("${CMAKE_FIND_PACKAGE_NAME}_QT_VERSION" "@VTK_QT_MAJOR_VERSION@")
+if(@vtk_qt_major_version@) # VTK_QT_VERSION
+  set("${CMAKE_FIND_PACKAGE_NAME}_QT_VERSION" "@vtk_qt_major_version@")
 endif ()
 
 include("${CMAKE_CURRENT_LIST_DIR}/vtkModule.cmake")

CMake/vtkQt.cmake

@@ -25,5 +25,5 @@ else()
     set(_vtk_qt_version 5)
   endif()
 endif()
-set(VTK_QT_MAJOR_VERSION ${_vtk_qt_version} CACHE INTERNAL
+set(vtk_qt_major_version ${_vtk_qt_version} CACHE INTERNAL
   "Major version number for the Qt installation used.")

GUISupport/Qt/CMakeLists.txt

@@ -36,16 +36,16 @@ include(vtkQt)
 set(qt_components
   OpenGL
   Widgets)
-if(VTK_QT_MAJOR_VERSION VERSION_GREATER_EQUAL 6)
+if(vtk_qt_major_version VERSION_GREATER_EQUAL 6)
   list(APPEND qt_components OpenGLWidgets)
 endif()
 
 vtk_module_find_package(
-  PACKAGE     "Qt${VTK_QT_MAJOR_VERSION}"
+  PACKAGE     "Qt${vtk_qt_major_version}"
   VERSION     5.9
   COMPONENTS  ${qt_components}
   FORWARD_VERSION_REQ MINOR
-  VERSION_VAR         "Qt${VTK_QT_MAJOR_VERSION}_VERSION")
+  VERSION_VAR         "Qt${vtk_qt_major_version}_VERSION")
 
 set(CMAKE_AUTOMOC 1)
 
@@ -55,7 +55,7 @@ vtk_module_add_module(VTK::GUISupportQt
   PRIVATE_HEADERS ${private_headers})
 
 foreach(_qt_comp IN LISTS qt_components)
-  list(APPEND qt_modules "Qt${VTK_QT_MAJOR_VERSION}::${_qt_comp}")
+  list(APPEND qt_modules "Qt${vtk_qt_major_version}::${_qt_comp}")
 endforeach()
 
 vtk_module_definitions(VTK::GUISupportQt PRIVATE QT_NO_KEYWORDS)

GUISupport/Qt/Testing/Cxx/CMakeLists.txt

@@ -54,7 +54,7 @@ vtk_add_test_cxx(vtkGUISupportQtCxxTests tests
   TestQVTKOpenGLWidgetWithMSAA,TestQtWithMSAA.cxx
   )
 
-find_package("Qt${VTK_QT_MAJOR_VERSION}" COMPONENTS Widgets REQUIRED)
+find_package("Qt${vtk_qt_major_version}" COMPONENTS Widgets REQUIRED)
 
 vtk_test_cxx_executable(vtkGUISupportQtCxxTests tests
   QTestApp.cxx
@@ -62,7 +62,7 @@ vtk_test_cxx_executable(vtkGUISupportQtCxxTests tests
 
 target_link_libraries(vtkGUISupportQtCxxTests
   PRIVATE
-    "Qt${VTK_QT_MAJOR_VERSION}::Widgets")
+    "Qt${vtk_qt_major_version}::Widgets")
 
 set_tests_properties(VTK::GUISupportQtCxx-TestQVTKOpenGLStereoWidgetPicking
  PROPERTIES RUN_SERIAL ON)

GUISupport/QtSQL/CMakeLists.txt

@@ -10,9 +10,9 @@ vtk_module_add_module(VTK::GUISupportQtSQL
 
 include(vtkQt)
 vtk_module_find_package(
-  PACKAGE     "Qt${VTK_QT_MAJOR_VERSION}"
+  PACKAGE     "Qt${vtk_qt_major_version}"
   COMPONENTS  Widgets Sql
   FORWARD_VERSION_REQ MINOR
-  VERSION_VAR         "Qt${VTK_QT_MAJOR_VERSION}_VERSION")
+  VERSION_VAR         "Qt${vtk_qt_major_version}_VERSION")
 vtk_module_link(VTK::GUISupportQtSQL
-  PUBLIC "Qt${VTK_QT_MAJOR_VERSION}::Sql" "Qt${VTK_QT_MAJOR_VERSION}::Widgets")
+  PUBLIC "Qt${vtk_qt_major_version}::Sql" "Qt${vtk_qt_major_version}::Widgets")

GUISupport/QtSQL/Testing/Cxx/CMakeLists.txt

@@ -3,9 +3,9 @@ vtk_add_test_cxx(vtkGUISupportQtSQLCxxTests tests
   TestQtSQLDatabase.cxx
   )
 
-find_package("Qt${VTK_QT_MAJOR_VERSION}" COMPONENTS Widgets REQUIRED)
+find_package("Qt${vtk_qt_major_version}" COMPONENTS Widgets REQUIRED)
 
 vtk_test_cxx_executable(vtkGUISupportQtSQLCxxTests tests)
 target_link_libraries(vtkGUISupportQtSQLCxxTests
   PRIVATE
-    "Qt${VTK_QT_MAJOR_VERSION}::Widgets")
+    "Qt${vtk_qt_major_version}::Widgets")

Rendering/Qt/CMakeLists.txt

@@ -11,8 +11,8 @@ vtk_module_add_module(VTK::RenderingQt
 
 include(vtkQt)
 vtk_module_find_package(
-  PACKAGE     "Qt${VTK_QT_MAJOR_VERSION}"
+  PACKAGE     "Qt${vtk_qt_major_version}"
   COMPONENTS  Widgets
   FORWARD_VERSION_REQ MINOR
-  VERSION_VAR         "Qt${VTK_QT_MAJOR_VERSION}_VERSION")
-vtk_module_link(VTK::RenderingQt PUBLIC "Qt${VTK_QT_MAJOR_VERSION}::Widgets")
+  VERSION_VAR         "Qt${vtk_qt_major_version}_VERSION")
+vtk_module_link(VTK::RenderingQt PUBLIC "Qt${vtk_qt_major_version}::Widgets")

Views/Qt/CMakeLists.txt

@@ -9,14 +9,14 @@ set(classes
 
 include(vtkQt)
 vtk_module_find_package(
-  PACKAGE     "Qt${VTK_QT_MAJOR_VERSION}"
+  PACKAGE     "Qt${vtk_qt_major_version}"
   COMPONENTS  Widgets
   FORWARD_VERSION_REQ MINOR
-  VERSION_VAR         "Qt${VTK_QT_MAJOR_VERSION}_VERSION")
+  VERSION_VAR         "Qt${vtk_qt_major_version}_VERSION")
 set(CMAKE_AUTOMOC 1)
 
 vtk_module_add_module(VTK::ViewsQt
   CLASSES ${classes})
 
 vtk_module_definitions(VTK::ViewsQt PRIVATE QT_NO_KEYWORDS)
-vtk_module_link(VTK::ViewsQt PRIVATE "Qt${VTK_QT_MAJOR_VERSION}::Widgets")
+vtk_module_link(VTK::ViewsQt PRIVATE "Qt${vtk_qt_major_version}::Widgets")