source: general/genlib/glib2.xml@ 082e722

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY glib2-download-http "&gnome-download-http;/glib/&glib2-minor;/glib-&glib2-version;.tar.xz">
  <!ENTITY glib2-download-ftp  "&gnome-download-ftp;/glib/&glib2-minor;/glib-&glib2-version;.tar.xz">
  <!ENTITY glib2-md5sum        "6fec7f51c177788282d4d6a000fe764d">
  <!ENTITY glib2-size          "5.0 MB">
  <!ENTITY glib2-buildsize     "157 MB (with tests)">
  <!ENTITY glib2-time          "0.5 SBU (add 0.5 SBU for tests; both using parallelism=4)">
]>

<sect1 id="glib2" xreflabel="GLib-&glib2-version;">
  <?dbhtml filename="glib2.html"?>


  <title>GLib-&glib2-version;</title>

  <indexterm zone="glib2">
    <primary sortas="a-GLib2">GLib2</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to GLib</title>

    <para>
      The <application>GLib</application> package contains low-level
      libraries useful for providing data structure handling for C, portability
      wrappers and interfaces for such runtime functionality as an
      event loop, threads, dynamic loading and an object system.
    </para>

    &lfs120_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&glib2-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&glib2-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &glib2-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &glib2-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &glib2-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &glib2-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Optional patch:
          <ulink url="&patch-root;/glib-skip_warnings-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">GLib Dependencies</bridgehead>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="libxslt"/> and
      <xref linkend="pcre2"/>
    </para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="dbus"/> (for some tests),
      <xref linkend="fuse3"/> and
      <ulink url="https://bindfs.org/">bindfs</ulink>
        (both needed for one test),
      <xref linkend="gdb"/> (for bindings),
      <xref linkend="DocBook"/>,
      <xref linkend="docbook-xsl"/>,
      <xref linkend="gtk-doc"/> (to build API documentation),
      <xref linkend="glib-networking"/> (for some tests, but this is a circular
      dependency), and
      <xref linkend="sysprof"/>
    </para>

    <bridgehead renderas="sect4">Additional Runtime Dependencies</bridgehead>
    <para role="recommended">
      <xref role="runtime" linkend="gobject-introspection"/>
      (should be installed before gtk+, atk, etc.)
    </para>
    <para role="optional">
      Quoted directly from the <filename>INSTALL</filename> file:
      <quote>Some of the mimetype-related functionality in GIO requires the
      <command>update-mime-database</command> and
      <command>update-desktop-database</command> utilities</quote>,
      which are part of
      <xref role="runtime" linkend="shared-mime-info"/> and
      <xref role="runtime" linkend="desktop-file-utils"/>, respectively.
      These two utilities are also needed for some tests.
    </para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of GLib</title>

    <para>
      If desired, apply the optional patch. In many cases, applications that
      use this library, either  directly or indirectly via other libraries such
      as <xref linkend="gtk3"/>, output numerous warnings when run from the
      command line.  This patch enables the use of an environment variable,
      <envar>GLIB_LOG_LEVEL</envar>, that suppresses unwanted messages. The
      value of the variable is a digit that corresponds to:
    </para>

    <simplelist>
      <member>1  Alert</member>
      <member>2  Critical</member>
      <member>3  Error</member>
      <member>4  Warning</member>
      <member>5  Notice</member>
    </simplelist>

    <para>
      For instance <userinput>export GLIB_LOG_LEVEL=4</userinput> will skip
      output of Warning and Notice messages (and Info/Debug messages if they
      are turned on).  If <envar>GLIB_LOG_LEVEL</envar> is not defined, normal
      message output will not be affected.
    </para>

<screen><userinput>patch -Np1 -i ../glib-skip_warnings-1.patch</userinput></screen>

    <warning>
      <para>
        If a previous version of glib is installed, move the headers out of the
        way so that later packages do not encounter conflicts:
      </para>

<screen role="root"><userinput remap="pre">if [ -e /usr/include/glib-2.0 ]; then
    rm -rf /usr/include/glib-2.0.old &amp;&amp;
    mv -vf /usr/include/glib-2.0{,.old}
fi</userinput></screen>

    </warning>

    <para>
      Install <application>GLib</application> by running the following
      commands:
    </para>

<screen><userinput>mkdir build &amp;&amp;
cd    build &amp;&amp;

meson setup ..            \
      --prefix=/usr       \
      --buildtype=release \
      -Dman=true          &amp;&amp;
ninja</userinput></screen>

    <note><para>
      If <xref linkend="libxslt"/> is installed, the above command may
      indicate several (about 33) errors that start with "Error: no ID for
      constraint linkend:" when generating the man pages.  These are harmless.
    </para></note>

    <para>
      The <application>GLib</application> test suite requires
      <application>desktop-file-utils</application> for some tests. However,
      <application>desktop-file-utils</application> requires
      <application>GLib</application> in order to compile; therefore, you must
      first install <application>GLib</application> and then run the test
      suite.
    </para>

    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>ninja install &amp;&amp;

mkdir -p /usr/share/doc/glib-&glib2-version; &amp;&amp;
cp -r ../docs/reference/{gio,glib,gobject} /usr/share/doc/glib-&glib2-version;</userinput></screen>

    <para>
      You should now install <xref linkend="desktop-file-utils"/> and
      <xref linkend="shared-mime-info"/> and proceed to
      run the test suite.
    </para>

    <warning>
      <para>
        Do not run the test suite as &root; or some tests will fail
        unexpectedly and leave some non-FHS-compliant directories in the
        <filename class='directory'>/usr</filename> hierarchy.
      </para>
    </warning>

    <para>
      To test the results, after having installed the package, issue:
      <command>LC_ALL=C ninja test</command> as a non-&root; user.
      <!-- https://gitlab.gnome.org/GNOME/glib/-/issues/2965
           Fixed for 2.78, but NOT any 2.76.x patch releases.
           PLEASE DO NOT REMOVE UNLESS YOU'VE TESTED WITH COREUTILS 9.2 OR
           LATER! -->
      One test named <literal>glib:gio / file</literal> is known to fail.
    </para>
  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
      href="../../xincludes/meson-buildtype-release.xml"/>

    <para>
      <parameter>-Dman=true</parameter>: This switch causes the
      build to create and install the package man pages.
    </para>

    <para>
      <option>-Dgtk_doc=true</option>: This switch causes the
      build to create and install the API documentation.
    </para>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          gapplication,           gdbus, gdbus-codegen,
          gio,                    gio-querymodules,
          glib-compile-resources, glib-compile-schemas,
          glib-genmarshal,        glib-gettextize,
          glib-mkenums,           gobject-query,
          gresource,              gsettings,
          gtester, and            gtester-report
        </seg>
        <seg>
          libgio-2.0.so,
          libglib-2.0.so,
          libgmodule-2.0.so,
          libgobject-2.0.so, and
          libgthread-2.0.so
        </seg>
        <seg>
          /usr/include/gio-unix-2.0,
          /usr/include/glib-2.0,
          /usr/lib/gio,
          /usr/lib/glib-2.0,
          /usr/share/glib-2.0,
          /usr/share/doc/{glib-2.0,glib-&glib2-version;}, and
          /usr/share/gtk-doc/html/{gio,glib,gobject} (optional)
        </seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="gapplication">
        <term><command>gapplication</command></term>
        <listitem>
          <para>
            can be used to start applications and to send
            messages to already-running instances of other applications
          </para>
          <indexterm zone="glib2 gapplication">
            <primary sortas="b-gapplication">application</primary>
          </indexterm>
        </listitem>
      </varlistentry>
      <varlistentry id="gdbus">
        <term><command>gdbus</command></term>
        <listitem>
          <para>
            is a simple tool used for working with
            <application>D-Bus</application> objects
          </para>
          <indexterm zone="glib2 gdbus">
            <primary sortas="b-gdbus">gdbus</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdbus-codegen">
        <term><command>gdbus-codegen</command></term>
        <listitem>
          <para>
            is used to generate code and/or documentation for one or
            more <application>D-Bus</application> interfaces
          </para>
          <indexterm zone="glib2 gdbus-codegen">
            <primary sortas="b-gdbus-codegen">gdbus-codegen</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gio">
        <term><command>gio</command></term>
        <listitem>
          <para>
            is a utility that makes many <application>GIO</application>
            features available from the command line
          </para>
          <indexterm zone="glib2 gio">
            <primary sortas="b-gio">gio</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gio-querymodules">
        <term><command>gio-querymodules</command></term>
        <listitem>
          <para>
            is used to create a <filename>giomodule.cache</filename> file in
            the listed directories. This file lists the implemented extension
            points for each module that has been found
          </para>
          <indexterm zone="glib2 gio-querymodules">
            <primary sortas="b-gio-querymodules">gio-querymodules</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="glib-compile-resources">
        <term><command>glib-compile-resources</command></term>
        <listitem>
          <para>
            is used to read the resource description from a file and
            the files that it references to create a binary resource
            bundle that is suitable for use with the GResource API
          </para>
          <indexterm zone="glib2 glib-compile-resources">
            <primary sortas="b-glib-compile-resources">glib-compile-resources</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="glib-compile-schemas">
        <term><command>glib-compile-schemas</command></term>
        <listitem>
          <para>
            is used to compile all the GSettings XML schema files
            in a directory into a binary file with the name
            <filename>gschemas.compiled</filename> that can be used by GSettings
          </para>
          <indexterm zone="glib2 glib-compile-schemas">
            <primary sortas="b-glib-compile-resources">glib-compile-schemas</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="glib-genmarshal">
        <term><command>glib-genmarshal</command></term>
        <listitem>
          <para>
            is a C code marshaller generation utility for GLib closures
          </para>
          <indexterm zone="glib2 glib-genmarshal">
            <primary sortas="b-glib-genmarshal">glib-genmarshal</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="glib-gettextize">
        <term><command>glib-gettextize</command></term>
        <listitem>
          <para>
            is a variant of the <application>gettext</application>
            internationalization utility
          </para>
          <indexterm zone="glib2 glib-gettextize">
            <primary sortas="b-glib-gettextize">glib-gettextize</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="glib-mkenums">
        <term><command>glib-mkenums</command></term>
        <listitem>
          <para>
            is a C language enum description generation utility
          </para>
          <indexterm zone="glib2 glib-mkenums">
            <primary sortas="b-glib-mkenums">glib-mkenums</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gobject-query">
        <term><command>gobject-query</command></term>
        <listitem>
          <para>
            is a small utility that draws a tree of types
          </para>
          <indexterm zone="glib2 gobject-query">
            <primary sortas="b-gobject-query">gobject-query</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gresource">
        <term><command>gresource</command></term>
        <listitem>
          <para>
            offers a simple command line interface to GResource
          </para>
          <indexterm zone="glib2 gresource">
            <primary sortas="b-gresource">gresource</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gsettings">
        <term><command>gsettings</command></term>
        <listitem>
          <para>
            offers a simple command line interface to GSettings
          </para>
          <indexterm zone="glib2 gsettings">
            <primary sortas="b-gsettings">gsettings</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gtester">
        <term><command>gtester</command></term>
        <listitem>
          <para>
            is a test running utility
          </para>
          <indexterm zone="glib2 gtester">
            <primary sortas="b-gtester">gtester</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gtester-report">
        <term><command>gtester-report</command></term>
        <listitem>
          <para>
            is a test report formatting utility
          </para>
          <indexterm zone="glib2 gtester-report">
            <primary sortas="b-gtester-report">gtester-report</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="GLib-libraries">
        <term>GLib libraries</term>
          <listitem>
          <para>
            contain low-level core libraries for the
            <application>GIMP</application> Toolkit
          </para>
          <indexterm zone="glib2 GLib-libraries">
            <primary sortas="c-GLib-libraries">Glib libraries</primary>
          </indexterm>
          </listitem>
        </varlistentry>

    </variablelist>

  </sect2>

</sect1>