source: BOOK/final-system/x86_64-64/eglibc.xml@ e919614

<?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;
]>

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

  <title>EGLIBC-&eglibc-version;</title>

  <indexterm zone="ch-system-eglibc">
    <primary sortas="a-EGLIBC">EGLIBC</primary>
  </indexterm>

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

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

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

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

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

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

    <para os="l1">Tell EGLIBC to install its libraries into
    <filename class="directory">/lib</filename>:</para>

<screen os="l2"><userinput>echo "slibdir=/lib" &gt;&gt; configparms</userinput></screen>

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

<screen os="h"><userinput>CFLAGS="-mtune=generic -g -O2" \
    ../eglibc-&eglibc-version;/configure --prefix=/usr \
    --disable-profile --enable-add-ons --enable-kernel=2.6.0 \
    --libexecdir=/usr/lib/eglibc --libdir=/usr/lib</userinput></screen>

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

      <varlistentry>
        <term><parameter>--libexecdir=/usr/lib/eglibc</parameter></term>
        <listitem>
          <para>This changes the location of the <command>pt_chown</command>
          program from its default of <filename
          class="directory">/usr/libexec</filename> to <filename
          class="directory">/usr/lib/eglibc</filename>.</para>
        </listitem>
      </varlistentry>
    </variablelist>

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

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

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

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

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../multilib/eglibc-64bit.xml"
    xpointer="xpointer(//*[@os='n'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../multilib/eglibc-64bit.xml"
    xpointer="xpointer(//*[@os='o'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../multilib/eglibc-64bit.xml"
    xpointer="xpointer(//*[@os='p'])"/>

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

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

    <para>The install will finish by checking that everything is correctly installed.
    Unfortunately, it will test for a multilib installation. On x86_64 Pure64 this means
    it will try to test the non-existent 32-bit loader which has a different name
    from the 64-bit loader (unlike on other 64-bit architectures).  We fool it by
    creating a symlink to the real loader.</para>

    <screen><userinput>ln -sv &eglibc-ld-name; /lib/ld-linux.so.2</userinput></screen>

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

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../common/eglibc.xml"
    xpointer="xpointer(//*[@os='t'])"/>

    <para>Now we can remove this symlink.  We also need to correct the <command>
    /usr/bin/ldd</command> script - if you look at this, you will see it references
    not only the 32-bit linker, but also /lib64 where it thinks the 64-bit linker
    is. The following <command>sed</command> will correct this:</para>

    <screen><userinput>rm -v /lib/ld-linux.so.2
cp -v /usr/bin/ldd{,.bak}
sed '/RTLDLIST/s%/ld-linux.so.2 /lib64%%' /usr/bin/ldd.bak >/usr/bin/ldd</userinput></screen>

    <para>Check the script to make sure the sed worked correctly, then delete
    the backup.</para>

    <screen><userinput>rm -v /usr/bin/ldd.bak</userinput></screen>

  </sect2>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/eglibc.xml"
  xpointer="xpointer(id('i18n-eglibc'))"/>

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

  <sect2 id="conf-ld" role="configuration">
    <title>Configuring The Dynamic Loader</title>

    <indexterm zone="conf-ld">
      <primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
    </indexterm>

    <para>By default, the dynamic loader (<filename
    class="libraryfile">/lib/ld-linux-x86-64.so.2</filename>) searches through
    <filename class="directory">/lib</filename> and <filename
    class="directory">/usr/lib</filename> for dynamic libraries that are
    needed by programs as they are run. However, if there are libraries in
    directories other than <filename class="directory">/lib</filename> and
    <filename class="directory">/usr/lib</filename>, these need to be
    added to the <filename>/etc/ld.so.conf</filename> file in order
    for the dynamic loader to find them. Two directories that are commonly
    known to contain additional libraries are <filename
    class="directory">/usr/local/lib</filename> and <filename
    class="directory">/opt/lib</filename>, so add those directories to the
    dynamic loader's search path.</para>

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

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

  </sect2>

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

</sect1>