lfs-book-zh_CN/chapter05/binutils-pass1.xml

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<sect1 id="ch-tools-binutils-pass1" role="wrap">
  <?dbhtml filename="binutils-pass1.html"?>

  <sect1info condition="script">
    <productname>binutils</productname>
    <productnumber>&binutils-version;</productnumber>
    <address>&binutils-url;</address>
  </sect1info>

  <title>Binutils-&binutils-version; - Pass 1</title>

  <indexterm zone="ch-tools-binutils-pass1">
    <primary sortas="a-Binutils">Binutils</primary>
    <secondary>tools, pass 1</secondary>
  </indexterm>

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

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
    href="../chapter06/binutils.xml"
    xpointer="xpointer(/sect1/sect2[1]/para[1])"/>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&binutils-ch5p1-sbu;</seg>
        <seg>&binutils-ch5p1-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Cross Binutils</title>

    <note><para>Go back and re-read the notes in the previous section. 
    Understanding the notes labeled important will save you a lot
    of problems later.</para></note>

    <para>It is important that Binutils be the first package compiled
    because both Glibc and GCC perform various tests on the available
    linker and assembler to determine which of their own features to
    enable.</para>

    <para>Apply a patch to prevent a build failure when using compiler optimizations:</para>

<screen><userinput remap="pre">patch -Np1 -i ../&binutils-build-patch;</userinput></screen>

    <para>The Binutils documentation recommends building Binutils outside of the
    source directory in a dedicated build directory:</para>

<screen><userinput remap="pre">mkdir -v ../binutils-build
cd ../binutils-build</userinput></screen>

    <note>
      <para>In order for the SBU values listed in the rest of the book
      to be of any use, measure the time it takes to build this package from
      the configuration, up to and including the first install. To achieve
      this easily, wrap the three commands in a <command>time</command>
      command like this: <userinput>time { ./configure ... &amp;&amp; make
      &amp;&amp; make install; }</userinput>.</para>
    </note>

    <note><para>The approximate build SBU values and required disk space
    in Chapter 5 does not include test suite data.</para></note>

    <para>Now prepare Binutils for compilation:</para>

<screen><userinput remap="configure">../binutils-&binutils-version;/configure     \
    --prefix=/tools            \
    --with-sysroot=$LFS        \
    --with-lib-path=/tools/lib \
    --target=$LFS_TGT          \
    --disable-nls              \
    --disable-werror</userinput></screen>

    <variablelist>
      <title>The meaning of the configure options:</title>

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

      <varlistentry>
        <term><parameter>--with-sysroot=$LFS</parameter></term>
        <listitem>
          <para>For cross compilation, this tells the build system to look in
          $LFS for the target system libraries as needed.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--with-lib-path=/tools/lib</parameter></term>
        <listitem>
          <para>This specifies which library path the linker should be
          configured to use.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><envar>--target=$LFS_TGT</envar></term>
        <listitem>
          <para>Because the machine description in the <envar>LFS_TGT</envar>
          variable is slightly different than the value returned by the
          <command>config.guess</command> script, this switch will tell the
          <command>configure</command> script to adjust Binutil's build system
          for building a cross linker.  </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--disable-nls</parameter></term>
        <listitem>
          <para>This disables internationalization as i18n is not needed for the
          temporary tools.</para>
        </listitem>
      </varlistentry>
       
      <varlistentry>
        <term><parameter>--disable-werror</parameter></term>
        <listitem>
          <para>This prevents the build from stopping in the event that there
          are warnings from the host's compiler.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Continue with compiling the package:</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>Compilation is now complete. Ordinarily we would now run the
    test suite, but at this early stage the test suite framework (Tcl,
    Expect, and DejaGNU) is not yet in place. The benefits of running the
    tests at this point are minimal since the programs from this
    first pass will soon be replaced by those from the second.</para>

    <para>If building on x86_64, create a symlink to ensure the sanity of
    the toolchain:</para>

<screen><userinput remap="install">case $(uname -m) in
  x86_64) mkdir -v /tools/lib &amp;&amp; ln -sv lib /tools/lib64 ;;
esac</userinput></screen>

    <para>Install the package:</para>

<screen><userinput remap="install">make install</userinput></screen>

  </sect2>

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

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

  </sect2>

</sect1>