source: general/genlib/glib2.xml@ 89a8d9a

<?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        "fb204b89b0004110911dede3441597a1">
  <!ENTITY glib2-size          "4.9 MB">
  <!ENTITY glib2-buildsize     "140 MB (add 8 MB for tests)">
  <!ENTITY glib2-time          "0.5 SBU (add 0.6 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>

    &lfs112_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-&glib2-version;-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>

    <para condition="html" role="usernotes">User Notes:
      <ulink url="&blfs-wiki;/glib2"/>
    </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-&glib2-version;-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 --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.
      <!-- glib issue #1954: -->
      <!-- One test named gdbus-server-auth sometimes fails.-->
      <!-- SysV has the symlink now, so gdatetime no longer fails.-->
      <!-- Needs /etc/localtime to be a symbolic link. In addition
      the link must be to some place like /usr/share/zoneinfo/...

      This can be overcome if the line below in glib/tests/gdatetime.c
      is removed or commented out.
      g_assert_true (*g_time_zone_get_identifier (tz) != '/');

      NOTE: systemd implements this as a hard requirement.  -->
      <!-- one test, g-file-info-filesystem-readonly.c, needs both
      bindfs and fusermount. With fuse3, you need to either create
      a fusermount->fusermount3 symlink or alter the source of the
      test so that fusermount3 is seeked and used. bindfs can be
      built against fuse3. The test is skipped if the dependencies
      are not found, and reported to pass.-->
      <!-- with 2.64.1 on sysV, all tests pass. -->
      <!-- with 2.70.1 on sysV, all tests pass. -->
      <!-- with 2.70.2 on sysV, all tests pass. -->
      <!-- with 2.72.3 on sysV, all tests pass. [pierre, July 2022] -->
      <!-- with 2.74.0 on sysV, all tests pass. [bdubbs, Sep 2022] -->
      <!-- with 2.74.3 on sysV, all tests pass. [pierre, Dec 2022] -->
    </para>
<!-- 2.64 is two years old
    <para>
      Finally, if this is a reinstall from glib2-2.64.x or earlier, remove
      (as the <systemitem class="username">root</systemitem> user) an
      obsolete header file that interferes with some packages:
    </para>

<screen role="nodump"><userinput>rm -f /usr/include/glib-2.0/glib/gurifuncs.h</userinput></screen>
-->
  </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/glib-2.0,
          /usr/share/glib-2.0,
          /usr/share/doc/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>