First set of build system patches for Qt5 support.

These changes enable support for Qt5 in CTK libraries and CTK Qt plugins.
Set the CTK_USE_QT5 CMake variable to ON on specify the Qt5 installaltion
directory in QT5_INSTALL_PREFIX.

CMake/ctkMacroBuildLib.cmake

@@ -28,7 +28,7 @@
 #! \ingroup CMakeAPI
 macro(ctkMacroBuildLib)
   ctkMacroParseArguments(MY
-    "NAME;EXPORT_DIRECTIVE;SRCS;MOC_SRCS;UI_FORMS;INCLUDE_DIRECTORIES;TARGET_LIBRARIES;RESOURCES;LIBRARY_TYPE"
+    "NAME;EXPORT_DIRECTIVE;SRCS;MOC_SRCS;GENERATE_MOC_SRCS;UI_FORMS;INCLUDE_DIRECTORIES;QT5_MODULES;TARGET_LIBRARIES;RESOURCES;LIBRARY_TYPE"
     "ENABLE_QTTESTING"
     ${ARGN}
     )
@@ -47,6 +47,20 @@ macro(ctkMacroBuildLib)
   if(NOT DEFINED MY_LIBRARY_TYPE)
     set(MY_LIBRARY_TYPE "SHARED")
   endif()
+  
+  if(MY_QT5_MODULES)
+    set(qt5_use_modules_list)
+    if(NOT CTK_USE_QT5)
+      message(WARNING "Argument QT5_MODULES ignored because CTK_USE_QT5 is not set.")
+    else()
+      foreach(qt5_module ${MY_QT5_MODULES})
+        find_package(${qt5_module} REQUIRED)
+        # strip the "Qt5" string from the module name
+        string(SUBSTRING ${qt5_module} 3 -1 _qt5_module_name)
+        list(APPEND qt5_use_modules_list ${_qt5_module_name})
+      endforeach()
+    endif()
+  endif()
 
   # Define library name
   set(lib_name ${MY_NAME})
@@ -105,13 +119,34 @@ macro(ctkMacroBuildLib)
   if(MY_MOC_SRCS)
     # this is a workaround for Visual Studio. The relative include paths in the generated
     # moc files can get very long and can't be resolved by the MSVC compiler.
-    foreach(moc_src ${MY_MOC_SRCS})
-      QT4_WRAP_CPP(MY_MOC_CPP ${moc_src} OPTIONS -f${moc_src})
-    endforeach()
+    if(Qt5Core_FOUND)
+      foreach(moc_src ${MY_MOC_SRCS})
+        qt5_wrap_cpp(MY_MOC_CPP ${moc_src} OPTIONS -f${moc_src})
+      endforeach()
+    else()
+      foreach(moc_src ${MY_MOC_SRCS})
+        QT4_WRAP_CPP(MY_MOC_CPP ${moc_src} OPTIONS -f${moc_src})
+      endforeach()
+    endif()
+  endif()
+  if(MY_GENERATE_MOC_SRCS)
+    QT4_GENERATE_MOCS(${MY_GENERATE_MOC_SRCS})
+  endif()
+  if(CTK_USE_QT5)
+    if(Qt5Widgets_FOUND)
+      qt5_wrap_ui(MY_UI_CPP ${MY_UI_FORMS})
+    elseif(MY_UI_FORMS)
+      message(WARNING "Argument UI_FORMS ignored because Qt5Widgets module was not specified")
+    endif()
+  else()
+    QT4_WRAP_UI(MY_UI_CPP ${MY_UI_FORMS})
   endif()
-  QT4_WRAP_UI(MY_UI_CPP ${MY_UI_FORMS})
   if(DEFINED MY_RESOURCES)
-    QT4_ADD_RESOURCES(MY_QRC_SRCS ${MY_RESOURCES})
+    if(Qt5Core_FOUND)
+      qt5_add_resources(MY_QRC_SRCS ${MY_RESOURCES})
+    else()
+      QT4_ADD_RESOURCES(MY_QRC_SRCS ${MY_RESOURCES})
+    endif()
   endif()
 
   source_group("Resources" FILES
@@ -132,6 +167,10 @@ macro(ctkMacroBuildLib)
     ${MY_UI_CPP}
     ${MY_QRC_SRCS}
     )
+    
+  if(CTK_USE_QT5 AND qt5_use_modules_list)
+    qt5_use_modules(${lib_name} ${qt5_use_modules_list})
+  endif()
 
   # Set labels associated with the target.
   set_target_properties(${lib_name} PROPERTIES LABELS ${lib_name})

CMake/ctkMacroBuildQtPlugin.cmake

@@ -28,7 +28,7 @@ macro(ctkMacroBuildQtPlugin)
   cmake_parse_arguments(MY
     "" # no options
     "NAME;EXPORT_DIRECTIVE;PLUGIN_DIR" # one value args
-    "SRCS;MOC_SRCS;UI_FORMS;INCLUDE_DIRECTORIES;TARGET_LIBRARIES;RESOURCES" # multi value args
+    "SRCS;MOC_SRCS;UI_FORMS;INCLUDE_DIRECTORIES;TARGET_LIBRARIES;QT5_MODULES;RESOURCES" # multi value args
     ${ARGN}
     )
 
@@ -43,6 +43,20 @@ macro(ctkMacroBuildQtPlugin)
     message(FATAL_ERROR "PLUGIN_DIR (e.g. designer, iconengines, imageformats...) is mandatory")
   endif()
   set(MY_LIBRARY_TYPE "MODULE")
+  
+  if(MY_QT5_MODULES)
+    set(qt5_use_modules_list)
+    if(NOT CTK_USE_QT5)
+      message(WARNING "Argument QT5_MODULES ignored because CTK_USE_QT5 is not set.")
+    else()
+      foreach(qt5_module ${MY_QT5_MODULES})
+        find_package(${qt5_module} REQUIRED)
+        # strip the "Qt5" string from the module name
+        string(SUBSTRING ${qt5_module} 3 -1 _qt5_module_name)
+        list(APPEND qt5_use_modules_list ${_qt5_module_name})
+      endforeach()
+    endif()
+  endif()
 
   # Define library name
   set(lib_name ${MY_NAME})
@@ -82,11 +96,27 @@ macro(ctkMacroBuildQtPlugin)
   set(MY_QRC_SRCS)
 
   # Wrap
-  QT4_WRAP_CPP(MY_MOC_CPP ${MY_MOC_SRCS})
-  QT4_WRAP_UI(MY_UI_CPP ${MY_UI_FORMS})
   set(MY_QRC_SRCS "")
-  if(DEFINED MY_RESOURCES)
-    QT4_ADD_RESOURCES(MY_QRC_SRCS ${MY_RESOURCES})
+  if(Qt5Core_FOUND)
+    qt5_wrap_cpp(MY_MOC_CPP ${MY_MOC_SRCS})
+    if(DEFINED MY_RESOURCES)
+      qt5_add_resources(MY_QRC_SRCS ${MY_RESOURCES})
+    endif()
+  else()
+    QT4_WRAP_CPP(MY_MOC_CPP ${MY_MOC_SRCS})
+    if(DEFINED MY_RESOURCES)
+      QT4_ADD_RESOURCES(MY_QRC_SRCS ${MY_RESOURCES})
+    endif()
+  endif()
+  
+  if(CTK_USE_QT5)
+    if(Qt5Widgets_FOUND)
+      qt5_wrap_ui(MY_UI_CPP ${MY_UI_FORMS})
+    elseif(MY_UI_FORMS)
+      message(WARNING "Argument UI_FORMS ignored because Qt5Widgets module was not specified")
+    endif()
+  else()
+    QT4_WRAP_UI(MY_UI_CPP ${MY_UI_FORMS})
   endif()
 
   source_group("Resources" FILES
@@ -106,6 +136,10 @@ macro(ctkMacroBuildQtPlugin)
     ${MY_UI_CPP}
     ${MY_QRC_SRCS}
     )
+  
+  if(CTK_USE_QT5 AND qt5_use_modules_list)
+    qt5_use_modules(${lib_name} ${qt5_use_modules_list})
+  endif()
 
   # Extract library name associated with the plugin and use it as label
   string(REGEX REPLACE "(.*)Plugin[s]?" "\\1" label ${lib_name})

CMake/ctkMacroGenerateMocs.cmake

@@ -4,7 +4,11 @@
 macro(QT4_GENERATE_MOCS)
   foreach(file ${ARGN})
     set(moc_file moc_${file})
-    QT4_GENERATE_MOC(${file} ${moc_file})
+    if(CTK_USE_QT5)
+      qt5_generate_moc(${file} ${moc_file})
+    else()
+      QT4_GENERATE_MOC(${file} ${moc_file})
+    endif()
 
     get_filename_component(source_name ${file} NAME_WE)
     get_filename_component(source_ext ${file} EXT)
@@ -19,3 +23,7 @@ macro(QT4_GENERATE_MOCS)
   endforeach()
 endmacro()
 
+# create a Qt5 alias
+macro(QT5_GENERATE_MOCS)
+  QT4_GENERATE_MOCS(${ARGN})
+endmacro()

CMake/ctkMacroSetupQt.cmake

@@ -21,33 +21,42 @@
 #! \ingroup CMakeUtilities
 macro(ctkMacroSetupQt)
 
-  set(minimum_required_qt_version "4.6")
-
-  find_package(Qt4)
-  
-  if(QT4_FOUND)
-
-    if("${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}" VERSION_LESS "${minimum_required_qt_version}")
-      message(FATAL_ERROR "error: CTK requires Qt >= ${minimum_required_qt_version} -- you cannot use Qt ${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}.${QT_VERSION_PATCH}.")
+  if(CTK_USE_QT5)
+    cmake_minimum_required(VERSION 2.8.9)
+    set(QT5_INSTALL_PREFIX "" CACHE PATH "The install location of Qt5")
+    if(NOT QT5_INSTALL_PREFIX OR NOT EXISTS ${QT5_INSTALL_PREFIX}/bin/qmake)
+      message(FATAL_ERROR "You must specify the install location of Qt5")
     endif()
-
-    set(QT_USE_QTNETWORK ON)
-    set(QT_USE_QTSQL ON)
-    set(QT_USE_QTOPENGL ON)
-    set(QT_USE_QTXML ON)
-    set(QT_USE_QTXMLPATTERNS ON)
-    set(QT_USE_QTTEST ${BUILD_TESTING})
-    include(${QT_USE_FILE})
-
-    # Set variable QT_INSTALLED_LIBRARY_DIR that will contains
-    # Qt shared library
-    set(QT_INSTALLED_LIBRARY_DIR ${QT_LIBRARY_DIR})
-    if(WIN32)
-      get_filename_component(QT_INSTALLED_LIBRARY_DIR ${QT_QMAKE_EXECUTABLE} PATH)
+    set(CMAKE_PREFIX_PATH ${QT5_INSTALL_PREFIX})
+  else()
+    set(minimum_required_qt_version "4.6")
+
+    find_package(Qt4)
+    
+    if(QT4_FOUND)
+
+      if("${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}" VERSION_LESS "${minimum_required_qt_version}")
+        message(FATAL_ERROR "error: CTK requires Qt >= ${minimum_required_qt_version} -- you cannot use Qt ${QT_VERSION_MAJOR}.${QT_VERSION_MINOR}.${QT_VERSION_PATCH}.")
+      endif()
+
+      set(QT_USE_QTNETWORK ON)
+      set(QT_USE_QTSQL ON)
+      set(QT_USE_QTOPENGL ON)
+      set(QT_USE_QTXML ON)
+      set(QT_USE_QTXMLPATTERNS ON)
+      set(QT_USE_QTTEST ${BUILD_TESTING})
+      include(${QT_USE_FILE})
+
+      # Set variable QT_INSTALLED_LIBRARY_DIR that will contains
+      # Qt shared library
+      set(QT_INSTALLED_LIBRARY_DIR ${QT_LIBRARY_DIR})
+      if(WIN32)
+        get_filename_component(QT_INSTALLED_LIBRARY_DIR ${QT_QMAKE_EXECUTABLE} PATH)
+      endif()
+
+    else()
+      message(FATAL_ERROR "error: Qt4 was not found on your system. You probably need to set the QT_QMAKE_EXECUTABLE variable")
     endif()
 
-  else()
-    message(FATAL_ERROR "error: Qt4 was not found on your system. You probably need to set the QT_QMAKE_EXECUTABLE variable")
   endif()
-
 endmacro()

SuperBuild.cmake

@@ -77,6 +77,7 @@ set(ctk_cmake_boolean_args
   CTK_BUILD_ALL_LIBRARIES
   CTK_BUILD_ALL_PLUGINS
   CTK_BUILD_QTDESIGNER_PLUGINS
+  CTK_USE_QT5
   CTK_USE_QTTESTING
   CTK_USE_KWSTYLE
   WITH_COVERAGE
@@ -157,6 +158,7 @@ ExternalProject_Add(${proj}
     -DCTK_INSTALL_DOC_DIR:STRING=${CTK_INSTALL_DOC_DIR}
     -DCTK_EXTERNAL_LIBRARY_DIRS:STRING=${CTK_EXTERNAL_LIBRARY_DIRS}
     -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
+    -DQT5_INSTALL_PREFIX:PATH=${QT5_INSTALL_PREFIX}
     ${CTK_SUPERBUILD_EP_ARGS}
     -DCTK_SUPERBUILD_EP_VARNAMES:STRING=${CTK_SUPERBUILD_EP_VARNAMES}
   SOURCE_DIR ${CTK_SOURCE_DIR}