lfs-book/chapter06/zlib.xml

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<sect1 id="ch-system-zlib" role="wrap">
  <?dbhtml filename="zlib.html"?>

  <title>Zlib-&zlib-version;</title>

  <indexterm zone="ch-system-zlib">
    <primary sortas="a-Zlib">Zlib</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The Zlib package contains compression and decompression routines used by
    some programs.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>0.1 SBU</seg>
        <seg>2.7 MB</seg>
      </seglistitem>
    </segmentedlist>

    <segmentedlist>
      <segtitle>&dependencies;</segtitle>

      <seglistitem>
        <seg>Binutils, Coreutils, GCC, Glibc, Make, and Sed</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

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

    <note>
      <para>Zlib is known to build its shared library incorrectly if
      <envar>CFLAGS</envar> is specified in the environment. If using
      a specified <envar>CFLAGS</envar> variable, be sure to add the
      <parameter>-fPIC</parameter> directive to the <envar>CFLAGS</envar>
      variable for the duration of the configure command below, then
      remove it afterwards.</para>
    </note>

    <para>Prepare Zlib for compilation:</para>

<screen><userinput>./configure --prefix=/usr --shared --libdir=/lib</userinput></screen>

    <para>Compile the package:</para>

<screen><userinput>make</userinput></screen>

    <para>To test the results, issue:
    <userinput>make check</userinput>.</para>

    <para>Install the shared library:</para>

<screen><userinput>make install</userinput></screen>

    <para>The previous command installed a <filename
    class="extension">.so</filename> file in <filename
    class="directory">/lib</filename>. We will remove it and relink it into
    <filename class="directory">/usr/lib</filename>:</para>

<screen><userinput>rm -v /lib/libz.so
ln -sfv ../../lib/libz.so.&zlib-version; /usr/lib/libz.so</userinput></screen>

    <para>Build the static library:</para>

<screen><userinput>make clean
./configure --prefix=/usr
make</userinput></screen>

    <para>To test the results again, issue:
    <userinput>make check</userinput>.</para>

    <para>Install the static library:</para>

<screen><userinput>make install</userinput></screen>

    <para>Fix the permissions on the static library:</para>

<screen><userinput>chmod -v 644 /usr/lib/libz.a</userinput></screen>

  </sect2>

  <sect2 id="contents-zlib" role="content">
    <title>Contents of Zlib</title>

    <segmentedlist>
      <segtitle>Installed libraries</segtitle>

      <seglistitem>
        <seg>libz.[a,so]</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="libz">
        <term><filename class="libraryfile">libz</filename></term>
        <listitem>
          <para>Contains compression and decompression functions used by
          some programs</para>
          <indexterm zone="ch-system-zlib libz">
            <primary sortas="c-libz">libz</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>