source: clfs-sysroot/BOOK/cross-tools/arm/glibc-headers.xml@ 3ceffbe

<?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>