Build System Integration

The Qt Interface Framework Generator is fully integrated in qmake and CMake to generate all or part of a project.

In it's simplest form, qmake/CMake can generate all the source code and the project only needs to configure the type of project to build.

For complex setups, you can combine generated code with application specific code to extend and use the generated code.

QMake

Example:

CONFIG += ifcodegen

QT_FOR_CONFIG += interfaceframework
!qtConfig(ifcodegen): error("No ifcodegen available")

IFCODEGEN_TEMPLATE = frontend
IFCODEGEN_SOURCES = example.qface
IFCODEGEN_MODULE_NAME = myModule
IFCODEGEN_OUTPUT_DIR = myOutputDir
IFCODEGEN_ANNOTATIONS = annotation.yaml

The following qmake variables are available:

For more details on the generator's command line arguments, see Use the Generator.

Note: Since the ifcodegen has specific system dependencies, it may not be available in all QtInterfaceFramework installation. In this case, the ifcodegen qmake feature is also not available and this can result in build errors.

In this case, use the following code snippet that makes sure the build stops and provides a meaningful error message:

QT_FOR_CONFIG += interfaceframework
!qtConfig(ifcodegen): error("No ifcodegen available")

CMake

In CMake the following functions and variables are provided by the QtInterfaceFramework package.

Variables

Commands

QtModule Support

QMake

The integration also supports generating code that you can subsequently compile into a Qt module. Since this module needs to work more closely with Qt's module building system, it shouldn't be loaded using the CONFIG variable, but using the load() function instead. The ifcodegen_qt_module feature replaces the load(qt_module) call.

The following shows how you can integrate the QtIfVehicleFunctions module:

TARGET = QtIfVehicleFunctions
QT = core core-private interfaceframework
CONFIG += c++11 ifcodegen

QT_FOR_CONFIG += interfaceframework
!qtConfig(ifcodegen): error("No ifcodegen available")

...

IFCODEGEN_MODULE_NAME = QtIfVehicleFunctions
IFCODEGEN_SOURCES += ifvehiclefunctions.qface

load(ifcodegen_qt_module)

CMake

The following shows how you can use CMake to build the QtIfVehicleFunctions module:

qt_ifcodegen_generate(
    IDL_FILES ifvehiclefunctions.qface
    TEMPLATE frontend
    MODULE_NAME QtIfVehicleFunctions
)

qt_internal_add_module(IfVehicleFunctions
    LIBRARIES
        Qt::CorePrivate
        Qt::InterfaceFrameworkPrivate
    PUBLIC_LIBRARIES
        Qt::Core
        Qt::InterfaceFramework
    PRIVATE_MODULE_INTERFACE
        Qt::CorePrivate
        Qt::InterfaceFrameworkPrivate
)

qt_ifcodegen_extend_target(IfVehicleFunctions
    NO_GENERATE
    IDL_FILES ifvehiclefunctions.qface
)

Before defining the module, the code needs to be generated as it has to be available for syncqt at this point. Afterwards the generated code is used to extend the module target.

SyncQt

In addition to the project file for the module library, the sync.profile also needs to be changed, as it's used to call the syncqt.pl script that generates the forwarding headers. Usually, the sync.profile is setup to search for these headers in the source folders. Using $out_basedir, you can also extend the script to search in the build folder.

...
%modules = ( # path to module name map
    "QtIfVehicleFunctions" => "$basedir/src/ifvehiclefunctions;$out_basedir/src/ifvehiclefunctions"
);
...