CMake with Qt Stephen Kelly stephen.kelly@kdab.com Qt Buildsystems - - PowerPoint PPT Presentation

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CMake with Qt Stephen Kelly stephen.kelly@kdab.com Qt Buildsystems - - PowerPoint PPT Presentation

Sep 25, 2023 26 likes •457 views

CMake with Qt Stephen Kelly stephen.kelly@kdab.com Qt Buildsystems Why CMake? Finding dependencies Providing shared libraries Platform independence Configure checks Code generators Extendible Scalable Related tools

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CMake with Qt

Stephen Kelly stephen.kelly@kdab.com

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Qt Buildsystems

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Why CMake?

  • Finding dependencies
  • Providing shared libraries
  • Platform independence
  • Configure checks
  • Code generators
  • Extendible
  • Scalable
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Related tools CPack CTest CDash

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Stages of building Configure Generate

moc Compile Link

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Finding Dependencies

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CMake today

find_package(Qt4 REQUIRED QtCore QtGui) include_directories(${QT_INCLUDES}) add_definitions(${QT_DEFINITIONS}) add_executable(myexe WIN32 main.cpp) target_link_libraries(myexe ${QT_QTCORE_LIBRARIES} ${QT_QTGUI_LIBRARIES} )

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CMake today

find_package(Qt5Widgets) include_directories(${Qt5Widgets_INCLUDE_DIRS}) add_definitions(${Qt5Widgets_DEFINITIONS}) set(CMAKE_POSITION_INDEPENDENT_CODE ON) add_executable(myexe WIN32 main.cpp) target_link_libraries(myexe ${Qt5Widgets_LIBRARIES} )

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QMake (Qt 5)

TARGET = myexe SOURCES = main.cpp QT += widgets

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CMake today

find_package(Qt5Widgets) include_directories(${Qt5Widgets_INCLUDE_DIRS}) add_definitions(${Qt5Widgets_DEFINITIONS}) set(CMAKE_POSITION_INDEPENDENT_CODE ON) add_executable(myexe WIN32 main.cpp) target_link_libraries(myexe ${Qt5Widgets_LIBRARIES} )

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CMake tomorrow (2013)

find_package(Qt5Widgets) add_executable(myexe WIN32 main.cpp) target_link_libraries(myexe Qt5::Widgets )

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CMake tomorrow (2013)

find_package(Qt4) add_executable(myexe WIN32 main.cpp) target_link_libraries(myexe Qt4::Gui )

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Finding dependencies find_package(Qt5Widgets) find_package(boost …) add_executable(dependent …) target_link_libraries(dependent Qt5::Widgets boost::spirit boost::mpl)

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The QTestLib problem

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Finding dependencies find_package(LibXml2)

  • Libraries
  • Header files
  • Defines
  • Version variables

find_package(Squish)

  • Executables
  • Test macros
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Finding dependencies

  • Treasure maps
  • FindLibXml2.cmake
  • FindSquish.cmake
  • FindQt4.cmake
  • Not part of upstream
  • Local Guide
  • Qt5WidgetsConfig.cmake
  • PulseAudioConfig.cmake
  • Part of upstream package
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Generating Code

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Generated code CMake

qt4_wrap_cpp(moc_files mywidget.h) qt4_wrap_ui(ui_files mywidget.ui) add_library(mylib ${sources} ${moc_files} ${ui_files})

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Generated code CMake

qt4_wrap_cpp(moc_files mywidget.h) qt4_wrap_ui(ui_files mywidget.ui) add_library(mylib ${sources} ${moc_files} ${ui_files})

QMake

SOURCES += mywidget.cpp HEADERS += mywidget.h mycontrol.h

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Automoc CMake (2.8.8)

  • No need for qt[4|5]_wrap_cpp
  • #include “moc_mywidget.cpp”
  • Or don't!
  • Finds Q_OBJECT in .h and .cpp files
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Automoc CMake (2.8.8)

qt4_wrap_ui(ui_files mywidget.ui) add_library(mylib ${sources} ${ui_files}) set_target_property(mylib AUTOMOC ON)

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Automoc CMake (2.8.8)

set(CMAKE_AUTOMOC ON) qt4_wrap_ui(ui_files mywidget.ui) add_library(mylib ${sources} ${ui_files})

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Extended code generation

qt4_create_translation(qm_files ${mylib_SRCS} mylib_de.ts )

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Extended code generation

qt4_generate_dbus_interface(mywidget.h com.kdab.mywidget.xml ) qt4_add_dbus_interfaces(dbus_files com.kdab.mywidget.xml)

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Platform independence

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Platform checks

check_include_file(“limits.h” HAVE_LIMITS) check_source_compiles( “#include <qglobal.h> #ifndef __PIC__ #error \"Compile your code with -fPIC or -fPIE.\" #endif “ HAVE_PIC )

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Creating Dependencies

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Providing dependencies install(TARGETS mylib EXPORT myexports …) install(TARGETS otherlib EXPORT myexports …) install(EXPORT myexport …)

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Providing dependencies install(EXPORT myexport FILENAME mytargets.cmake) … # mylibConfig.cmake include(mytargets.cmake) mylib_helpful_macro(...)

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Providing dependencies # No Findmylib.cmake needed! find_package(mylib) add_executable(dependent …) target_link_libraries(dependent mylib

  • therlib)
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Imported targets # Qt5GuiConfig.cmake add_library(Qt5::Gui IMPORTED) set_target_property(Qt5::Gui LOCATION “/opt/qt5/lib/Qt5Gui.so” )

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Imported targets # Qt5GuiConfig.cmake add_library(Qt5::Gui IMPORTED) set_target_property(Qt5::Gui INTERFACE_INCLUDE_DIRECTORIES “/opt/qt5/include/Qt5Gui” “$<TARGET_INCLUDES:Qt5::Core>” )

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Imported targets # Qt5GuiConfig.cmake add_library(Qt5::Gui IMPORTED) set_target_property(Qt5::Gui INTERFACE_INCLUDE_DIRECTORIES “/opt/qt5/include/Qt5Gui” “$<TARGET_PROPERTY:Qt5::Core,INTERFACE_INCLUDE_DIRECTRIES>” )

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Imported targets # Qt5GuiConfig.cmake add_library(Qt5::Gui IMPORTED) set_target_property(Qt5::Gui INTERFACE_INCLUDE_DIRECTORIES “/opt/qt5/include/Qt5Gui” “$<TARGET_INCLUDES:Qt5::Core>” )

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qtmain.lib QMake

CONFIG -= console

CMake (Qt 4)

add_executable(exec WIN32 …) target_link_libraries(${QT_QTMAIN_LIBS})

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qtmain.lib CMake (Qt 5)

add_executable(exec WIN32 …) target_link_libraries(${QT_QTMAIN_LIBS})

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Imported targets # Qt5GuiConfig.cmake add_library(Qt5::Gui IMPORTED) set_target_property(Qt5::Gui INTERFACE_LINK_LIBRARIES “$<TARGET_LIBRARIES:Qt5::Core>” “$<$<WIN32_EXECUTABLE>:Qt5::WinMain>” )

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Declarative expressions add_executable(CoolApp …) target_link_libraries(CoolApp Qt5::Widgets $<$<CONFIG:Debug>:Qt5::Test> )

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Declarative expressions add_executable(CoolApp …) set_target_property(CoolApp INCLUDE_DIRECTORIES $<$<CONFIG:Debug>:/usr/include/valgrind> )

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  • Object orientated
  • Declarative
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Qt Buildsystems

QBS

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Configure Generate

moc Compile Link

QBS

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Questions?

Stephen Kelly stephen.kelly@kdab.com