source: BOOK/final-system/multilib/perl-64bit.xml@ cade792

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<sect1 id="ch-system-perl" role="wrap">
  <?dbhtml filename="perl-64bit.html"?>

  <title>Perl-&perl-version; 64 Bit</title>

  <indexterm zone="ch-system-perl">
    <primary sortas="a-Perl">Perl</primary>
  </indexterm>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/perl.xml"
  xpointer="xpointer(//*[@role='package'])"/>

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

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='p1'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='p2'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='p3'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='p4'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='s1'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='s2'])"/>

    <para os="mp1">Perl does not, by default, know about library directories with names other
    than lib, The following patch will allow it to install to other directories:</para>

<screen os="mp2"><userinput>patch -Np1 -i ../&perl-multilib-patch;</userinput></screen>

    <para os="s1">There is a further (possibly cosmetic) anomaly - if we install perl and
    then run <command>perl -V</command> it will claim that libc is in /lib.  The
    following sed fixes this, but only takes effect when <command>make install
    </command> is run:</para>

<screen os="s2"><userinput>sed -i "/libc/s@/lib@/lib64@" hints/linux.sh</userinput></screen>

    <para os="m2">We still need to tell perl to actually use lib64:</para>

<screen os="m3"><userinput>echo 'installstyle="lib64/perl5"' >>hints/linux.sh</userinput></screen>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='a'])"/>

<screen os="b"><userinput>./configure.gnu --prefix=/usr \
   -Dman1dir=/usr/share/man/man1 \
   -Dman3dir=/usr/share/man/man3 \
   -Dpager="/bin/less -isR" \
   -Dlibpth="/usr/local/lib64 /lib64 /usr/lib64" \
   -Dcc="gcc ${BUILD64}" \
   -Dusethreads</userinput></screen>

    <variablelist os="m4">
      <title>The meaning of the new configure option:</title>

      <varlistentry>
        <term><parameter>-Dlibpth="/usr/local/lib64 /lib64 /usr/lib64"</parameter></term>
        <listitem>
          <para>This tells Perl to link against the 64-bit libraries.</para>
        </listitem>
      </varlistentry>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='c1'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='c2'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='c3'])"/>

    </variablelist>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='d'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='e'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='h'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='j'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/perl.xml"
    xpointer="xpointer(//*[@os='k'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="perl.xml"
    xpointer="xpointer(//*[@os='l'])"/>

<screen os="m"><userinput>mv /usr/bin/perl{,-64}
mv /usr/bin/perl&perl-version;{,-64}</userinput></screen>

    <para os="n">Now we need to create a link to the multiarch wrapper that
    lets us choose which perl installation to use:</para>

<screen os="o"><userinput>ln -sv multiarch_wrapper /usr/bin/perl
ln -sv multiarch_wrapper /usr/bin/perl&perl-version;</userinput></screen>

    <para os="p">The value of the <envar>USE_ARCH</envar> environment variable
    will decide which perl binary to execute.
    <command>USE_ARCH=32 perl -V:cc</command> will give the value of CC used to
    build the 32bit perl. The multiarch_wrapper will help later with building
    perl extensions and bindings. Without the multiarch_wrapper it is very hard
    to setup a 32bit extension or binding.</para>

  </sect2>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/perl.xml"
  xpointer="xpointer(id('contents-perl'))"/>

</sect1>