source: BOOK/cross-tools/alpha/glibc-headers.xml@ cade792

<?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-cross-tools-glibc-headers" role="wrap">
  <?dbhtml filename="glibc-headers.html"?>

  <title>Glibc-&glibc-version; Headers</title>

  <indexterm zone="ch-cross-tools-glibc-headers">
    <primary sortas="a-Glibc">Glibc</primary>
    <secondary>cross tools, headers</secondary>
  </indexterm>

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

  <sect2 role="installation">
    <title>Installation of Glibc Headers</title>

    <para os="s1">The following sed removes a dependency of gcc 3.4.x from
    the glibc we are using in cross-lfs. The reason we are changing it is
    because this only installs the headers, no compiling takes place. In the
    next Glibc installation, we use the GCC that's built right after this section:</para>

<screen os="s2"><userinput>cp -v configure{,.orig}
sed -e 's/3.4/3.[0-9]/g' configure.orig > configure</userinput></screen>

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

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

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

<screen os="de"><userinput>echo "libc_cv_forced_unwind=yes" &gt; config.cache
echo "libc_cv_c_cleanup=yes" &gt;&gt; config.cache
echo "libc_cv_mlong_double_128=yes" &gt;&gt; config.cache
echo "libc_cv_alpha_tls=yes" &gt;&gt; config.cache</userinput></screen>

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

<screen os="s3"><userinput>CC=gcc ../glibc-&glibc-version;/configure --prefix=/tools \
   --host=${CLFS_TARGET} --build=${CLFS_HOST} \
   --disable-sanity-checks --enable-kernel=2.6.0 \
   --with-headers=/tools/include --cache-file=config.cache \
   --with-binutils=/cross-tools/${CLFS_TARGET}/bin</userinput></screen>

    <note os="e1">
      <para><emphasis>Any</emphasis> error message you see about nptl at this point
      can safely be ignored.</para>
   </note>

    <variablelist os="ca">
       <title>The meaning of the configure options:</title>

          <varlistentry os="ca1">
             <term><parameter>CC=gcc</parameter></term>
             <listitem>
                <para>Tells Glibc to use the host's GCC compiler.</para>
             </listitem>
          </varlistentry>

         <varlistentry os="ca2">
            <term><parameter>--prefix=/tools</parameter></term>
            <listitem>
               <para>This tells the configure script to prepare to install the
                  package in the <filename class="directory">/tools</filename>
                  directory.</para>
             </listitem>
         </varlistentry>

         <varlistentry os="ca3">
            <term><parameter>--build=${CLFS_HOST}</parameter></term>
            <listitem>
               <para>When used with --host, this creates a cross-architecture
                  executable that creates files for ${CLFS_TARGET} but runs on ${CLFS_HOST}.</para>
            </listitem>
        </varlistentry>

        <varlistentry os="ca4">
           <term><parameter>--host=${CLFS_TARGET}</parameter></term>
           <listitem>
               <para>When used with --build, this creates a cross-architecture
                  executable that creates files for ${CLFS_TARGET} but runs on ${CLFS_HOST}.</para>
           </listitem>
        </varlistentry>

       <varlistentry os="ca5">
          <term><parameter>--disable-sanity-checks</parameter></term>
          <listitem>
             <para>This switch disables any checks that are in place.</para>
           </listitem>
       </varlistentry>

       <varlistentry os="ca6">
            <term><parameter>--enable-kernel=2.6.0</parameter></term>
            <listitem>
               <para>This tells Glibc to compile the library with support
               for 2.6.x Linux kernels.</para>
            </listitem>
       </varlistentry>

       <varlistentry os="ca7">
           <term><parameter>--with-headers=/tools/include</parameter></term>
           <listitem>
              <para>This tells Glibc to compile itself against the headers
              recently installed to the <filename class="directory">/tools</filename>
              directory, so that it knows exactly what features the kernel has
              and can optimize itself accordingly.</para>
           </listitem>
       </varlistentry>

       <varlistentry os="ca8">
           <term><parameter>--with-binutils=/cross-tools/${CLFS_TARGET}/bin</parameter></term>
           <listitem>
              <para>This tells Glibc to use the Binutils for our specific target architecture.</para>
            </listitem>
       </varlistentry>

       </variablelist>

   <para os="cb">Now, install the headers:</para>

<screen os="cd"><userinput>make install-headers</userinput></screen>

   <para os="ce">Some files aren't installed by the above command, so
    we will copy the additional header files we need.</para>

   <para os="cf">First we will copy a common file over to <filename
   class="directory">/tools/include</filename>:</para>

<screen os="cg"><userinput>install -dv /tools/include/bits
cp -v bits/stdio_lim.h /tools/include/bits</userinput></screen>

   <para os="ch">Now we will create a blank stub file:</para>

<screen os="ci"><userinput>touch /tools/include/gnu/stubs.h</userinput></screen>

   <para os="cj">Another header is needed for NPTL:</para>

<screen><userinput>cp -v ../glibc-&glibc-version;/nptl/sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h \
    /tools/include/bits/</userinput></screen>

  </sect2>

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

    <para>Details on this package are located in <xref
    linkend="contents-glibc" role="."/></para>

  </sect2>

</sect1>