source: clfs-embedded/BOOK/cross-tools/x86/uclibc.xml@ 3800899

<?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;
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<sect1 id="ch-cross-tools-uclibc" role="wrap">
  <?dbhtml filename="uclibc.html"?>

  <title>uClibc-&uclibc-version;</title>

  <indexterm zone="ch-cross-tools-uclibc">
    <primary sortas="a-uClibc">uClibc</primary>
    <secondary>cross tools</secondary>
  </indexterm>

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

    <para>The uClibc package contains the main C library. This library provides
    the basic routines for allocating memory, searching directories, opening and
    closing files, reading and writing files, string handling, pattern matching,
    arithmetic, and so on.</para>

  </sect2>

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

    <para os="a">Since we are cross-compiling, we need to make sure when we
    configuration for our architecture we get the correct information. The
    following sed makes sure we are using the proper settings for our
    architecture: (This is a place holder for the other architectures</para>

<screen os="b"><userinput>cp extra/Configs/Config.in extra/Configs/Config.in.orig
sed -e "s:default TARGET_i386:default TARGET_i386:" \
   extra/Configs/Config.in.orig > extra/Configs/Config.in</userinput></screen>

    <note os="c">
      <para>Below we are just telling uClibc to use the default configuration of
      uClibc. For those for more adventureous, you can use make menuconfig, and
      do a more custom build of your uClibc.</para>
    </note>

    <para os="d">Create default configuration:</para>

<screen os="e"><userinput>make defconfig</userinput></screen>

   <para os="f">We will need to edit the configuration file, to make sure everything gets
   compiled and put into it's proper locations:</para>

<screen os="g"><userinput>cp .config .config.orig
sed -e "/^CROSS_COMPILER_PREFIX/s:=.*:=\"${CLFS_TARGET}-\":" \
    -e "/^KERNEL_SOURCE/s:=.*:=\"${CLFS}/usr\":" \
    -e "/^SHARED_LIB_LOADER_PREFIX/s:=.*:=\"/lib\":" \
    -e "/^DEVEL_PREFIX/s:=.*:=\"/usr\":" \
    -e "/^RUNTIME_PREFIX/s:=.*:=\"/\":" \
    .config.orig > .config</userinput></screen>

    <para os="h">We will need to make sure that some settings in uClibc are set so we
    can utilize all the features of BusyBox:</para>

<screen os="i"><userinput>UCLIBC_OPTIONS="DO_C99_MATH UCLIBC_HAS_RPC UCLIBC_HAS_CTYPE_CHECKED UCLIBC_HAS_WCHAR UCLIBC_HAS_HEXADECIMAL_FLOATS
                UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE UCLIBC_HAS_PRINTF_M_SPEC UCLIBC_HAS_FTW UCLIBC_HAS_IPV6"
for config in $UCLIBC_OPTIONS; do
        cp .config .config.orig
        sed -e "s:# ${config} is not set:${config}=y:" .config.orig > .config
done
echo "UCLIBC_HAS_FULL_RPC=y" >> .config</userinput></screen>

    <para os="j">Compile the package:</para>

<screen os="k"><userinput>make TARGET_ARCH=i386</userinput></screen>

   <para os="l">We will remove the files that were copied over from our Linux Headers, these
   files were copied into the source directory of uClibc:</para>

<screen os="m"><userinput>rm include/{asm,asm-generic,linux}</userinput></screen>

    <para os="n">Install the package:</para>

<screen os="o"><userinput>make PREFIX=${CLFS} install</userinput></screen>

  </sect2>

  <sect2 id="contents-uclibc" role="content">
    <title>Contents of uClibc</title>

    <segmentedlist>
      <segtitle>Installed uClibc</segtitle>

      <seglistitem>
        <seg>To Be Written</seg>
      </seglistitem>
    </segmentedlist>
<!--
    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

     <varlistentry id="uclibc">
        <term><filename
        class="headerfile">/usr/include/{asm,linux}/*.h</filename></term>
        <listitem>
          <para>The Linux API headers</para>
          <indexterm zone="ch-system-linux-headers linux-headers">
            <primary
            sortas="e-/usr/include/{asm,linux}/*.h">/usr/include/{asm,linux}/*.h</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>
-->

  </sect2>
</sect1>