/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
    \previouspage Artifact
    \nextpage Export
    \qmltype Depends
    \inqmlmodule QbsLanguageItems
    \ingroup list-of-items
    \keyword QML.Depends

    \brief Represents dependencies between products and modules.

    A Depends item can appear inside a \l{Product} or \l{Module} item.

    For example, the following product will load the \l{cpp} module. In
    addition, it will try to load modules that may or may not exist, and
    pass this information on to the compiler.

    \code
    Product {
        Depends { name: "cpp" }
        Depends {
            name: "optional_module"
            versionAtLeast: "2.0"
            required: false
        }

        Properties {
            condition: optional_module.present
            cpp.defines: "HAS_OPTIONAL_MODULE"
        }

        // ...
    }
    \endcode


    \section1 Dependency Parameters

    Sometimes it is desirable to have certain dependencies handled differently
    than others. For example, one might want to depend on a dynamic library
    without linking it.

    This can be done by setting the \l{dependency-parameters-cpp}{cpp.link}
    dependency parameter to \c{true} in the dynamic library dependency:

    \code
    Product {
        Depends { name: "cpp" }
        Depends { name: "some_dynamic_lib"; cpp.link: false }

        // ...
    }
    \endcode

    Dependency parameters are a special type of property that can only be set
    within Depends and \l [QML] {Parameters} items. Dependency parameters are
    declared in the modules they belong to.

    In the example above, the \l{cpp} module declares the parameter \c{link}.
    The Depends item for \c{some_dynamic_lib} sets \c{cpp.link} to
    \c{false}, which tells the linker rule to ignore this particular dependency.
*/

/*!
    \qmlproperty bool Depends::condition

    Determines whether the dependency will actually be applied.

    \defaultvalue \c true
*/

/*!
    \qmlproperty string Depends::versionAtLeast

    The minimum value that the dependency's \c version property needs to have.
    If the actual version is lower than that, loading the dependency will fail.
    The value consists of integers separated by dots.

    \nodefaultvalue
*/

/*!
    \qmlproperty string Depends::versionBelow

    A value that the dependency's \c version property must be lower than. If the
    actual version is equal to or higher than that, loading the dependency will
    fail. The value consists of integers separated by dots.

    \nodefaultvalue
*/

/*!
    \qmlproperty stringList Depends::productTypes

    A list of product types. Any enabled product in the project that has a
    matching type will become a dependency of the product containing the Depends
    item.

    This property is mutually exclusive with the \l name and \l submodules
    properties.

    The \l required and \l profiles properties are ignored if this property is
    set.

    Product types attached via Module::additionalProductTypes are not considered.

    \nodefaultvalue
*/

/*!
    \qmlproperty bool Depends::required

    Setting this property to \c false creates a \e{soft dependency}, meaning
    that it is not considered an error if the given module cannot be found.
    In such a case, an instance of the respective module will be created, but
    only the \l{Module::present}{Module.present} property will be available for
    querying, and it will be set to \c false.

    \defaultvalue \c true
*/

/*!
    \qmlproperty string Depends::name

    The name of the dependent product or module.

    \nodefaultvalue
*/

/*!
    \qmlproperty stringList Depends::profiles

    A list of profiles.

    If the dependency is on a product and that product is going to be built for
    more than one profile, you can specify here which instance of the product
    the dependency is on.

    See the \l{qbs::profiles}{qbs.profiles} property for more information.
    An empty list means a dependency on all instances of the product with the given name,
    regardless of their profile.

    \nodefaultvalue
*/

/*!
    \qmlproperty bool Depends::limitToSubProject

    If \l productTypes is set and this property is \c true, only products that
    are in the same sub-project as the product containing the Depends item are
    considered.

    \defaultvalue \c false
*/

/*!
    \qmlproperty stringList Depends::submodules

    A list of submodules of the module to depend on, if applicable.

    \nodefaultvalue
*/

/*!
    \qmlproperty bool Depends::enableFallback

    Whether to fall back to a pkg-config based \l{Module Providers}{module provider}
    if the dependency is not found.

    \defaultvalue \c true
*/
