Default QtCreator QML Quick Controls Project Fails To Link

Jman006

I have been trying for a little bit to get a QML Quick Controls 2 project to build for iOS using CMake. Everything seems to build just fine, but the link step fails. The errors can be seen on my pastbin post:
https://pastebin.com/Mm07v7k1

I know QML can compile and link for iOS (both a device and simulator) because I can use QtCreator to build the QML Gallery example: https://doc.qt.io/qt-5.10/qtquickcontrols2-gallery-example.html with no issues.

Even empty QtCreator generated projects utilizing CMake do not build to completion, so I thought I would ask here for help.

I suspect it has something to do with linking and importing the appropriate plugins that come packaged with Qt.

Here are my files for reference.

# CMakeLists.txt
cmake_minimum_required(
    VERSION
        3.7.1
)

project(
    QMLGallery
)

find_package(Qt5Core REQUIRED)
find_package(Qt5Gui REQUIRED)
find_package(Qt5Widgets REQUIRED)
find_package(Qt5Quick REQUIRED)
find_package(Qt5Qml REQUIRED)
find_package(Qt5QuickControls2 REQUIRED)

######################################################################
find_library(
    Qt5Quick2Plugin
    NAMES
        libqtquick2plugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick.2
)

find_library(
    Qt5QuickControls2Plugin
    NAMES
        libqtquickcontrols2plugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2
)

find_library(
    Qt5QuickTemplates2Plugin
    NAMES
        libqtquicktemplates2plugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Templates.2
)

find_library(
    Qt5QuickWindow2Plugin
    NAMES
        libwindowplugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Window.2
)

find_library(
    Qt5QuickControls2MaterialStylePlugin
    NAMES
        libqtquickcontrols2materialstyleplugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Material
)

find_library(
    Qt5QuickControls2UniversalStylePlugin
    NAMES
        libqtquickcontrols2Universalstyleplugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Universal
)

find_library(
    Qt5QMLSettingsPlugin
    NAMES
        libqmlsettingsplugin.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/Qt/labs/settings
)

find_library(
    Qt5IOSPlatformPlugin
    NAMES
        libqios.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/plugins/platforms
)

###########################

find_library(
    Qt5Quick2PluginD
    NAMES
        libqtquick2plugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick.2
)

find_library(
    Qt5QuickControls2PluginD
    NAMES
        libqtquickcontrols2plugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2
)

find_library(
    Qt5QuickTemplates2PluginD
    NAMES
        libqtquicktemplates2plugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Templates.2
)

find_library(
    Qt5QuickWindow2PluginD
    NAMES
        libwindowplugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Window.2
)

find_library(
    Qt5QuickControls2MaterialStylePluginD
    NAMES
        libqtquickcontrols2materialstyleplugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Material
)

find_library(
    Qt5QuickControls2UniversalStylePluginD
    NAMES
        libqtquickcontrols2Universalstyleplugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Universal
)

find_library(
    Qt5QMLSettingsPluginD
    NAMES
        libqmlsettingsplugin_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/qml/Qt/labs/settings
)

find_library(
    Qt5IOSPlatformPluginD
    NAMES
        libqios_debug.a
    HINTS
        /Users/daddymac/Qt/5.10.1/ios/plugins/platforms
)

######################################################################

set(CMAKE_INCLUDE_CURRENT_DIR "ON")
set(CMAKE_AUTOMOC "ON")
set(CMAKE_AUTORCC "ON")

set(CMAKE_CXX_VERSION "11")


# qt5_add_resources(
#     RESOURCES
#         ${CMAKE_CURRENT_SOURCE_DIR}/Resources.qrc
#     OPTIONS --name Resources
    
# )

set(EXECUTABLE_TARGET
    "QMLGalleryApp"
)

set(
    DEFINITION_FILES
    ${CMAKE_CURRENT_SOURCE_DIR}/gallery.cpp
)

set(
    INCLUDE_PATHS
    ${CMAKE_CURRENT_SOURCE_DIR}
    ${Qt5Core_INCLUDE_DIRS}
    ${Qt5Widgets_INCLUDE_DIRS}
    ${Qt5Gui_INCLUDE_DIRS}
    ${Qt5Quick2_INCLUDE_DIRS}
    ${Qt5QuickControls2_INCLUDE_DIRS}
    /Users/daddymac/Qt/5.10.1/ios/mkspecs/common/uikit
)

set(
    LINK_TARGETS
    ${Qt5Core_LIBRARIES}
    ${Qt5Widgets_LIBRARIES}
    ${Qt5Gui_LIBRARIES}
    ${Qt5Quick2_LIBRARIES}
    ${Qt5QuickControls2_LIBRARIES}
    
    ${Qt5QMLSettingsPlugin}
    ${Qt5QuickControls2UniversalStylePlugin}
    ${Qt5QuickControls2MaterialStylePlugin}
    ${Qt5QuickWindow2Plugin}
    ${Qt5QuickTemplates2Plugin}
    ${Qt5QuickControls2Plugin}
    ${Qt5Quick2Plugin}
    ${Qt5IOSPlatformPlugin}
    
    ${Qt5QMLSettingsPluginD}
    ${Qt5QuickControls2UniversalStylePluginD}
    ${Qt5QuickControls2MaterialStylePluginD}
    ${Qt5QuickWindow2PluginD}
    ${Qt5QuickTemplates2PluginD}
    ${Qt5QuickControls2PluginD}
    ${Qt5Quick2PluginD}
    ${Qt5IOSPlatformPluginD}
)

######################################################################

add_executable(${EXECUTABLE_TARGET}
    ${DEFINITION_FILES}
)

target_include_directories(${EXECUTABLE_TARGET}
    PUBLIC
        ${INCLUDE_PATHS}
}
)

target_link_libraries(${EXECUTABLE_TARGET}
    PUBLIC
        ${LINK_TARGETS}
)

The project itself is the gallery example I mentioned above. Any ideas what is causing the link issues?

jpnurmi

Try find_package(Qt5QuickTemplates2 REQUIRED) and then adding ${Qt5QuickTemplates2_LIBRARIES} to LINK_TARGETS.

Jman006

@jpnurmi said in Default QtCreator QML Quick Controls Project Fails To Link:

Try find_package(Qt5QuickTemplates2 REQUIRED) and then adding ${Qt5QuickTemplates2_LIBRARIES} to LINK_TARGETS

There is no Config.cmake files for Qt5Templates2. There is a plugin that I tried linking to as you can see in my CMakeLists.txt file. I also have the required Q_IMPORT_PLUGIN(QtQuickTemplates2Plugin); inside the gallery.cpp file.

Jman006

The source code branch seems to package QQuickTemplates2 with QtQuickControls2, so I think those should be linking in.

jpnurmi

Hmm, the missing symbols are in libQt5QuickTemplates2, not in libqtquicktemplates2plugin. As of today, the QtQuickTemplates2 library is indeed not public. I suppose Qt generates .cmake files only for public libraries. Sorry, I'm not using CMake with Qt so I don't know the exact details, but somehow you must get it to link with libQt5QuickTemplates2. :)

Jman006

@jpnurmi

Do you know where in a Qt installation that library would be located?

jpnurmi

Together with other libs (not plugins). You can run qmake -query from a specific Qt installation. Something like:

$ ~/Qt/5.10.1/ios/bin/qmake -query QT_INSTALL_LIBS
/Users/daddymac/Qt/5.10.1/ios/lib

$ ls /Users/daddymac/Qt/5.10.1/ios/lib
[...]
libQt5QuickTemplates2.a
[...]

Jman006

@jpnurmi
I understand now. I still am getting link errors. Now it looks like there are definitions missing that are in the libpng (i.e. libqtlibpng.a)

Is there some qmake query that I can run on a static library to get all of its dependent Qt libraries or something? Or even if I could run the query on a bare bones .pro project and see all of the resulting static libraries and their locations, I could probably resolve the link issues.

Jman006

So I updated my CMakeLists.txt file to represent what is generated by qmake in QtCreator as far as the link and include items.

cmake_minimum_required(
    VERSION
        3.7.1
)

project(
    QMLGallery
)

set(CMAKE_INCLUDE_CURRENT_DIR "ON")
set(CMAKE_AUTOMOC "ON")
set(CMAKE_AUTORCC "ON")

set(EXECUTABLE_TARGET
    "QMLGalleryApp"
)

set(
    DEFINITION_FILES
    ${CMAKE_CURRENT_SOURCE_DIR}/gallery.cpp
)

set(
    INCLUDE_PATHS
    ${CMAKE_CURRENT_SOURCE_DIR}
    ${CMAKE_CURRENT_BINARY_DIR}
    /Users/daddymac/Qt/5.10.1/ios/mkspecs/common/uikit
    /Users/daddymac/Qt/5.10.1/ios/include
    /Users/daddymac/Qt/5.10.1/ios/include/QtQuickControls2
    /Users/daddymac/Qt/5.10.1/ios/include/QtQuick
    /Users/daddymac/Qt/5.10.1/ios/include/QtGui
    /Users/daddymac/Qt/5.10.1/ios/include/QtQml
    /Users/daddymac/Qt/5.10.1/ios/include/QtNetwork
    /Users/daddymac/Qt/5.10.1/ios/include/QtCore
    /Users/daddymac/Qt/5.10.1/ios/mkspecs/macx-ios-clang   
)

add_executable(${EXECUTABLE_TARGET}
    ${DEFINITION_FILES}
)

target_include_directories(${EXECUTABLE_TARGET}
    PUBLIC
        ${INCLUDE_PATHS}
)

macro(ADD_FRAMEWORK fwname appname path)
    find_library(FRAMEWORK_${fwname}
    NAMES ${fwname}
    PATHS ${path}
    NO_DEFAULT_PATH
    )
    
    if( ${FRAMEWORK_${fwname}} STREQUAL FRAMEWORK_${fwname}-NOTFOUND)
        MESSAGE(ERROR ": Framework ${fwname} not found")
    else()
        target_link_libraries(${appname} PUBLIC "${FRAMEWORK_${fwname}}/${fwname}")
        MESSAGE(STATUS "Framework ${fwname} found at ${FRAMEWORK_${fwname}}")
    endif()
endmacro(ADD_FRAMEWORK)

add_framework(
    Foundation
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    UIKit
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    QuartzCore
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    AudioToolbox
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    AssetsLibrary
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    MobileCoreServices
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    CoreFoundation
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    CoreGraphics
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    OpenGLES
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    CoreText
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    ImageIO
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

add_framework(
    Security
    ${EXECUTABLE_TARGET}
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks
)

target_link_libraries(${EXECUTABLE_TARGET}
    PUBLIC
    "-L/Users/daddymac/Qt/5.10.1/ios/lib"
    "-L/Users/daddymac/Qt/5.10.1/ios/plugins/imageformats"
    "-L/Users/daddymac/Qt/5.10.1/ios/plugins/platforms"
    "-L/Users/daddymac/Qt/5.10.1/ios/plugins/qmltooling"
    "-L/Users/daddymac/Qt/5.10.1/ios/plugins/bearer"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick.2"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Layouts"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Material"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Controls.2/Universal"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/Qt/labs/settings"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Templates.2"
    "-L/Users/daddymac/Qt/5.10.1/ios/qml/QtQuick/Window.2"
    "-lqios"
    "-lQt5FontDatabaseSupport"
    "-lqtfreetype"
    "-lQt5GraphicsSupport"
    "-lQt5ClipboardSupport"
    "-lqgif"
    "-lqicns"
    "-lqico"
    "-lqjpeg"
    "-lqmacjp2"
    "-lqtga"
    "-lqtiff"
    "-lqwbmp"
    "-lqwebp"
    "-lqmldbg_debugger"
    "-lqmldbg_inspector"
    "-lqmldbg_local"
    "-lqmldbg_messages"
    "-lqmldbg_native"
    "-lqmldbg_nativedebugger"
    "-lqmldbg_profiler"
    "-lqmldbg_quickprofiler"
    "-lqmldbg_server"
    "-lQt5PacketProtocol"
    "-lqmldbg_tcp"
    "-lqgenericbearer"
    "-lqtquick2plugin"
    "-lqquicklayoutsplugin"
    "-lqtquickcontrols2plugin"
    "-lqtquickcontrols2materialstyleplugin"
    "-lqtquickcontrols2universalstyleplugin"
    "-lQt5QuickControls2"
    "-lqmlsettingsplugin"
    "-lqtquicktemplates2plugin"
    "-lQt5QuickTemplates2"
    "-lwindowplugin"
    "-lQt5Quick"
    "-lQt5Qml"
    "-lQt5Gui"
    "-lqtlibpng"
    "-lqtharfbuzz"
    "-lQt5Network"
    "-lQt5Core"
    "-lm"
    "-lz"
    "-lqtpcre2"
)

A quick inspection looks like everything discussed so far has been included, but I am still getting reference errors.

https://pastebin.com/7vLqcPeP

Jman006

@Jman006

Ok I made progress. This CMakeLists.txt is hardcoded for the iOS simulator. When I select the simulator in XCode, everything links properly. I still have a runtime error, but that is a different issue.

I'm still working on getting the both simulator and actual hardware versions to build. I'll post back the results.