source: BOOK/cross-tools/alpha/glibc-headers.xml@ 7cb0700

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<!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">Glibc's <filename>configure</filename> script checks the
    version of GCC, and will fail if it's less than 3.4. The next Glibc build
    will use the GCC that will be installed into
    <filename class="directory">/cross-tools</filename> in the next step.
    However, in this step only the Glibc headers are being installed - no
    compiling is taking place - so the GCC version isn't important. The
    following sed removes the dependency of GCC 3.4.x:</para>

<screen os="s2"><userinput>cp -v configure{,.orig}
sed -e 's/3.4/3.[0-9]/g' configure.orig &gt; 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
echo "libc_cv_gnu89_inline=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>