lfs-book-zh_CN/chapter06/zlib.xml

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

  <sect1info condition="script">
    <productname>zlib</productname>
    <productnumber>&zlib-version;</productnumber>
    <address>&zlib-url;</address>
  </sect1info>

  <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>&zlib-ch6-sbu;</seg>
        <seg>&zlib-ch6-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

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

    <para>First, fix a typo in the package header file:</para>

<screen><userinput remap="pre">sed -i 's/ifdef _LARGEFILE64_SOURCE/ifndef _LARGEFILE64_SOURCE/' zlib.h</userinput></screen>

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

<screen><userinput remap="configure">CFLAGS='-mstackrealign -fPIC -O3' ./configure --prefix=/usr</userinput></screen>

    <variablelist>
      <title>The meaning of the new configure environment variable:</title>

      <varlistentry>
        <term><envar>CFLAGS='-mstackrealign -fPIC -O3'</envar></term>
        <listitem>
          <para>Setting CFLAGS overrides the default optimization in the
          package to prevent some run time errors.  Note that the -mstackrealign
          may cause build failures in non-Intel architeture systems.</para>
        </listitem>
      </varlistentry>
    </variablelist>



    <para>Compile the package:</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>To test the results, issue:</para>

<screen><userinput remap="test">make check</userinput></screen>

    <para>Install the package:</para>

<screen><userinput remap="install">make install</userinput></screen>

    <para>The shared library needs to be moved to
    <filename class="directory">/lib</filename>, and as a result the
    <filename class="extension">.so</filename> file in
    <filename class="directory">/usr/lib</filename> will need to be recreated:</para>

<screen><userinput remap="install">mv -v /usr/lib/libz.so.* /lib
ln -sfv ../../lib/libz.so.&zlib-version; /usr/lib/libz.so</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>