lfs/chapter08/gmp.xml

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-gmp" role="wrap">
  <?dbhtml filename="gmp.html"?>

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

  <title>GMP-&gmp-version;</title>

  <indexterm zone="ch-system-gmp">
    <primary sortas="a-GMP">GMP</primary>
  </indexterm>

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

    <para>The GMP package contains math libraries. These have useful functions
    for arbitrary precision arithmetic.</para>

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

      <seglistitem>
        <seg>&gmp-fin-sbu;</seg>
        <seg>&gmp-fin-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

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

    <note>
      <para>If you are building for 32-bit x86, but you have a CPU which is
      capable of running 64-bit code <emphasis>and</emphasis> you have specified
      <envar>CFLAGS</envar> in the environment, the configure script will
      attempt to configure for 64-bits and fail.
      Avoid this by invoking the configure command below with
<screen role="nodump"><userinput><parameter>ABI=32</parameter> ./configure ...</userinput></screen></para>
    </note>

    <note>
      <para>The default settings of GMP produce libraries optimized for
      the host processor.  If libraries suitable for processors less
      capable than the host's CPU are desired, generic libraries can be
      created by appending the <option>--host=none-linux-gnu</option> option
      to the <command>configure</command> command.</para>

      <!-- To editors: the configure script says "the none host is obsolete,
           use - -disable-assembly," but don't believe it: with the latter
           CFLAGS is still automatically set to -march=something.  -->
    </note>

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

<screen><userinput remap="configure">./configure --prefix=/usr    \
            --enable-cxx     \
            --disable-static \
            --docdir=/usr/share/doc/gmp-&gmp-version;</userinput></screen>

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

      <varlistentry>
        <term><parameter>--enable-cxx</parameter></term>
        <listitem>
          <para>This parameter enables C++ support</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--docdir=/usr/share/doc/gmp-&gmp-version;</parameter></term>
        <listitem>
          <para>This variable specifies the correct place for the
          documentation.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Compile the package and generate the HTML documentation:</para>

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

    <important>
      <para>The test suite for GMP in this section is considered critical.
      Do not skip it under any circumstances.</para>
    </important>

    <para>Test the results:</para>

<screen><userinput remap="test">make check 2>&amp;1 | tee gmp-check-log</userinput></screen>

    <caution><para>The code in gmp is highly optimized for the processor where
    it is built. Occasionally, the code that detects the processor misidentifies
    the system capabilities and there will be errors in the tests or other
    applications using the gmp libraries with the message
    <computeroutput>Illegal instruction</computeroutput>.
    In this case, gmp should be reconfigured with the option
    <option>--host=none-linux-gnu</option> and rebuilt.</para></caution>

    <!-- Some tests PASS on a specific uarch but SKIP on other CPUs.
         For example on K8 the following command outputs 200.  -->
    <para>Ensure that at least 199 tests in the test suite passed.
    Check the results by issuing the following command:</para>

<screen><userinput remap="test">awk '/# PASS:/{total+=$3} ; END{print total}' gmp-check-log</userinput></screen>

    <para>Install the package and its documentation:</para>

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

  </sect2>

  <sect2 id="contents-gmp" role="content">
    <title>Contents of GMP</title>

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

      <seglistitem>
        <seg>libgmp.so and libgmpxx.so</seg>
        <seg>/usr/share/doc/gmp-&gmp-version;</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="libgmp">
        <term><filename class="libraryfile">libgmp</filename></term>
        <listitem>
          <para>Contains precision math functions</para>
          <indexterm zone="ch-system-gmp libgmp">
            <primary sortas="c-libgmp">libgmp</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libgmpxx">
        <term><filename class="libraryfile">libgmpxx</filename></term>
        <listitem>
          <para>Contains C++ precision math functions</para>
          <indexterm zone="ch-system-gmp libgmpxx">
            <primary sortas="c-libgmpxx">libgmpxx</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>

  </sect2>

</sect1>