MacOS X CMake Kit with BundleUtiliies for Qt App

Question

I am starting to work with CMake and have a problem creating a Qt application package for MacOS X. Let's look at the application of the simple helloworld widget in only one file main.cpp.

// main.cpp
#include <QApplication>
#include <QLabel>

int main(int argc, char** argv)
{
    QApplication app(argc,argv);
    QLabel lbl("Hello");
    lbl.show();
    return app.exec();
}

The file is CMakeLists.txtalso simple.

# CMakeLists.txt
cmake_minimum_required( VERSION 3.0 )
project( QtBundle )    
set( CMAKE_INCLUDE_CURRENT_DIR ON )
set( CMAKE_AUTOMOC ON )

set( SOURCES main.cpp )    
find_package( Qt5Widgets REQUIRED )

add_executable( ${PROJECT_NAME} MACOSX_BUNDLE ${SOURCES} )    
qt5_use_modules( ${PROJECT_NAME} Widgets )

I run cmake .. -DCMAKE_PREFIX_PATH=/path/to/Qt5.5.1/and generate Makefilein a directory build.

Then I started makeand had the directory QtBundle.appas I wanted, and the QtBundle.app/Contents/MacOS/QtBundleexecutable, OK.

But when I run it, I get:

This application failed to start because it could not find or load the Qt platform plugin "cocoa".

Reinstalling the application may fix this problem.
Abort trap: 6 

, - , - Qt (Framework libs ), macdeployqt Framework PlugIns .

, CMake BundleUtilities macdeployqt.

, Qt5 BundleUtilities.

- "helloworld" , CMake ?

.

: CMake BundleUtilities ?

Answer 1

CMakeLists.txt. - , , , BundleUtilities fixup_bundle().

install_qt5_plugin() . Qt, . Qt5:: QCocoaIntegrationPlugin Qt5Gui, Qt5Widgets find_package(Qt5 COMPONENTS Widgets REQUIRED). Macro install() . (. QT_PLUGIN) fixup_bundle().

:

• qt.conf, , .
• APPS , .
• DIRS . , CMAKE_PREFIX_PATH.
• APPS, QT_PLUGINS DIRS , .
• / ( ), . Qt .

. , CMAKE_INSTALL_PREFIX, , install .

.dmg

mkdir build
cd build
cmake ..
cpack -G DragNDrop

CMakeLists.txt :

set(prefix "${PROJECT_NAME}.app/Contents")
set(INSTALL_RUNTIME_DIR "${prefix}/MacOS")
set(INSTALL_CMAKE_DIR "${prefix}/Resources")

# based on code from CMake QtDialog/CMakeLists.txt
macro(install_qt5_plugin _qt_plugin_name _qt_plugins_var _prefix)
    get_target_property(_qt_plugin_path "${_qt_plugin_name}" LOCATION)
    if(EXISTS "${_qt_plugin_path}")
        get_filename_component(_qt_plugin_file "${_qt_plugin_path}" NAME)
        get_filename_component(_qt_plugin_type "${_qt_plugin_path}" PATH)
        get_filename_component(_qt_plugin_type "${_qt_plugin_type}" NAME)
        set(_qt_plugin_dest "${_prefix}/PlugIns/${_qt_plugin_type}")
        install(FILES "${_qt_plugin_path}"
            DESTINATION "${_qt_plugin_dest}")
        set(${_qt_plugins_var}
            "${${_qt_plugins_var}};\$ENV{DEST_DIR}\${CMAKE_INSTALL_PREFIX}/${_qt_plugin_dest}/${_qt_plugin_file}")
    else()
        message(FATAL_ERROR "QT plugin ${_qt_plugin_name} not found")
    endif()
endmacro()

install_qt5_plugin("Qt5::QCocoaIntegrationPlugin" QT_PLUGINS ${prefix})
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/qt.conf"
    "[Paths]\nPlugins = ${_qt_plugin_dir}\n")
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/qt.conf"
    DESTINATION "${INSTALL_CMAKE_DIR}")

# Destination paths below are relative to ${CMAKE_INSTALL_PREFIX}
install(TARGETS ${PROJECT_NAME}
    BUNDLE DESTINATION . COMPONENT Runtime
    RUNTIME DESTINATION ${INSTALL_RUNTIME_DIR} COMPONENT Runtime
    )

# Note Mac specific extension .app
set(APPS "\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${PROJECT_NAME}.app")

# Directories to look for dependencies
set(DIRS "${CMAKE_BINARY_DIR}")

# Path used for searching by FIND_XXX(), with appropriate suffixes added
if(CMAKE_PREFIX_PATH)
    foreach(dir ${CMAKE_PREFIX_PATH})
        list(APPEND DIRS "${dir}/bin" "${dir}/lib")
    endforeach()
endif()

# Append Qt lib folder which is two levels above Qt5Widgets_DIR
list(APPEND DIRS "${Qt5Widgets_DIR}/../..")

include(InstallRequiredSystemLibraries)

message(STATUS "APPS: ${APPS}")
message(STATUS "QT_PLUGINS: ${QT_PLUGINS}")
message(STATUS "DIRS: ${DIRS}")

install(CODE "include(BundleUtilities)
    fixup_bundle(\"${APPS}\" \"${QT_PLUGINS}\" \"${DIRS}\")")

set(CPACK_GENERATOR "DRAGNDROP")
include(CPack)