71 lines
2.8 KiB
XML
71 lines
2.8 KiB
XML
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="sec-language-qt">
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<title>Qt</title>
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<para>The information in this section applies to Qt 5.5 and later.</para>
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<para>Qt is an application development toolkit for C++. Although it is
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not a distinct programming language, there are special considerations
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for packaging Qt-based programs and libraries. A small set of tools
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and conventions has grown out of these considerations.</para>
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<section xml:id="ssec-qt-libraries"><title>Libraries</title>
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<para>Packages that provide libraries should be listed in
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<varname>qt5LibsFun</varname> so that the library is built with each
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Qt version. A set of packages is provided for each version of Qt; for
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example, <varname>qt5Libs</varname> always provides libraries built
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with the latest version, <varname>qt55Libs</varname> provides
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libraries built with Qt 5.5, and so on. To avoid version conflicts, no
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top-level attributes are created for these packages.</para>
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</section>
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<section xml:id="ssec-qt-programs"><title>Programs</title>
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<para>Application packages do not need to be built with every Qt
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version. To ensure consistency between the package's dependencies,
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call the package with <literal>qt5Libs.callPackage</literal> instead
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of the usual <literal>callPackage</literal>. An older version may be
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selected in case of incompatibility. For example, to build with Qt
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5.5, call the package with
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<literal>qt55Libs.callPackage</literal>.</para>
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<para>Several environment variables must be set at runtime for Qt
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applications to function correctly, including:</para>
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<itemizedlist>
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<listitem><para><envar>QT_PLUGIN_PATH</envar></para></listitem>
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<listitem><para><envar>QML_IMPORT_PATH</envar></para></listitem>
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<listitem><para><envar>QML2_IMPORT_PATH</envar></para></listitem>
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<listitem><para><envar>XDG_DATA_DIRS</envar></para></listitem>
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</itemizedlist>
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<para>To ensure that these are set correctly, the program must be wrapped by
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invoking <literal>wrapQtProgram <replaceable>program</replaceable></literal>
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during installation (for example, during
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<literal>fixupPhase</literal>). <literal>wrapQtProgram</literal>
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accepts the same options as <literal>makeWrapper</literal>.
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</para>
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</section>
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<section xml:id="ssec-qt-kde"><title>KDE</title>
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<para>Many of the considerations above also apply to KDE packages,
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especially the need to set the correct environment variables at
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runtime. To ensure that this is done, invoke <literal>wrapKDEProgram
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<replaceable>program</replaceable></literal> during
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installation. <literal>wrapKDEProgram</literal> also generates a
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<literal>ksycoca</literal> database so that required data and services
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can be found. Like its Qt counterpart,
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<literal>wrapKDEProgram</literal> accepts the same options as
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<literal>makeWrapper</literal>.</para>
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</section>
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</section>
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