source: clfs-sysroot/BOOK/cross-tools/arm/glibc-headers.xml@ 4c1e84e

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
  "http://www.oasis-open.org/docbook/xml/4.4/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="../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 chapter, we use the GCC that's built right after this chapter.</para>
        
<screen os="s2"><userinput>cp 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="glibc.xml"
    xpointer="xpointer(//*[@os='u1'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="glibc.xml"
    xpointer="xpointer(//*[@os='u2'])"/>

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

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

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

<screen os="e"><userinput>echo "libc_cv_forced_unwind=yes" &gt; config.cache
echo "libc_cv_c_cleanup=yes" &gt;&gt; config.cache
echo "libc_cv_arm_tls=yes" &gt;&gt; config.cache</userinput></screen>

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

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

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

<screen os="i"><userinput>CC=gcc ../glibc-&glibc-version;/configure --prefix=/usr \
   --host=${CLFS_TARGET} --build=${CLFS_HOST} \
   --with-headers=${CLFS}/usr/include --cache-file=config.cache</userinput></screen>

    <variablelist os="dj">
       <title>The meaning of the configure options:</title>
        
          <varlistentry os="dj1">
             <term><parameter>CC=gcc</parameter></term>
             <listitem>
                <para>Tells Glibc to use the hosts GCC compiler.</para>
             </listitem>
          </varlistentry>
        
       <varlistentry os="dj2">
           <term><parameter>--with-headers=${CLFS}/usr/include</parameter></term>
           <listitem>
              <para>This tells Glibc to compile itself against the headers
              recently installed to the <filename class="directory">${CLFS}/usr/include</filename>
              directory, so that it knows exactly what features the kernel has
              and can optimize itself accordingly.</para>
           </listitem>
       </varlistentry>
        
     </variablelist>
        
   <para os="k">Now, install the headers:</para>

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

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

   <para os="n">First we will copy a common file over to <filename 
   class="directory">${CLFS}/usr/include</filename>:</para>

<screen os="o"><userinput>install -dv ${CLFS}/usr/include/bits
cp -v bits/stdio_lim.h ${CLFS}/usr/include/bits</userinput></screen>

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

<screen os="q"><userinput>touch ${CLFS}/usr/include/gnu/stubs.h</userinput></screen>

   <para os="r">Another header is needed for NPTL:</para>
   
<screen os="s"><userinput>cp -v ../glibc-&glibc-version;/ports/sysdeps/unix/sysv/linux/arm/nptl/bits/pthreadtypes.h \
    ${CLFS}/usr/include/bits</userinput></screen>

  </sect2>

  <sect2 role="content" id="contents-glibc-headers">
    <title/>

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

  </sect2>

</sect1>