<?xml version="1.0" encoding="UTF-8"?>
<!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-tools-libstdcpp" role="wrap">
  <?dbhtml filename="gcc-libstdc++.html"?>

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

  <title>GCC-&gcc-version; 中的 Libstdc++</title>

  <indexterm zone="ch-tools-libstdcpp">
    <primary sortas="a-GCC">GCC</primary>
    <secondary>tools, libstdc++</secondary>
  </indexterm>

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

    <!--para>Libstdc++ is the standard C++ library. It is needed 
    to compile C++ code
    (part of GCC is written in C++), but we had to defer its installation
    when we built <xref linkend="ch-tools-gcc-pass1"/>
    because it depends on glibc, which was not yet available in /tools.
    </para-->
	<para>Libstdc++ 是 C++ 标准库，我们需要它才能编译 C++ 代码
    （GCC 的一部分用 C++ 编写）。但在构建
	<xref linkend="ch-tools-gcc-pass1"/> 时我们不得不暂缓安装它，
	因为它依赖于当时还没有安装到 /tools 的 glibc。</para>

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

      <seglistitem>
        <seg>&libstdcpp-ch5-sbu;</seg>
        <seg>&libstdcpp-ch5-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>安装目标系统的 Libstdc++</title>

    <note>
      <!--para><application>Libstdc++</application> is part of the GCC sources.
      You should first unpack the GCC tarball and change to the
      <filename>gcc-&gcc-version;</filename> directory.</para-->
      <para><application>Libstdc++</application> 是 GCC 源代码的一部分。
		  您应该先解压 GCC 源码包并切换到解压出来的
		  <filename>gcc-&gcc-version;</filename> 目录。</para>
    </note>

    <!--para>Create a separate build directory for Libstdc++ and enter it:</para-->
    <para>为 Libstdc++ 创建一个单独的构建目录，并进入它：</para>

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

    <para>准备编译 Libstdc++：</para>

<screen><userinput remap="configure">../libstdc++-v3/configure           \
    --host=$LFS_TGT                 \
    --prefix=/tools                 \
    --disable-multilib              \
    --disable-nls                   \
    --disable-libstdcxx-threads     \
    --disable-libstdcxx-pch         \
    --with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</userinput></screen>

    <variablelist>
      <title>配置选项的含义：</title>

      <varlistentry>
        <term><parameter>--host=...</parameter></term>
        <listitem>
          <!--para>Indicates to use the cross compiler we have just built
          instead of the one in <filename>/usr/bin</filename>.</para-->
	      <para>使用我们刚刚编译的交叉编译器，而不是
			  <filename>/usr/bin</filename> 中的宿主系统编译器。</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--disable-libstdcxx-threads</parameter></term>
        <listitem>
          <!--para>Since we have not yet built the C threads library, the C++
          one cannot be built either.</para-->
	      <para>由于我们目前还没有构建 C 线程库，C++ 线程库也不能构建。
		  </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--disable-libstdcxx-pch</parameter></term>
        <listitem>
          <!--para>This switch prevents the installation of precompiled
          include files, which are not needed at this stage.</para-->
          <para>这个开关防止安装预编译头文件，在这个阶段不需要它们。</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</parameter></term>
        <listitem>
          <!--para>This is the location where the standard include files are
          searched by the C++ compiler. In a normal build, this information
          is automatically passed to the Libstdc++ <command>configure</command>
          options from the top level directory. In our case, this information
          must be explicitly given.</para-->
          <para>这是 C++ 编译器搜索标准头文件的位置。在正常的构建过程中，
			  这项信息被顶层目录构建系统自动传递给 Libstdc++
			  <command>configure</command> 脚本。
			  然而我们这里没有使用顶层构建系统，因此必须明确给出这项信息。
		  </para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>运行以下命令编译 Libstdc++：</para>

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

    <para>安装这个库：</para>

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

  </sect2>

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

    <para>关于该软件包的详细信息可以在
		<xref linkend="contents-gcc"/> 中找到。</para>

  </sect2>

</sect1>
