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+<?xml version="1.0" encoding="UTF-8"?>
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+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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+ "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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+ <!ENTITY % general-entities SYSTEM "../general.ent">
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+ %general-entities;
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+]>
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+
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+<sect1 id="ch-system-strippingagain">
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+ <?dbhtml filename="strippingagain.html"?>
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+
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+ <title>再次移除调试符号</title>
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+
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+ <!--para>This section is optional. If the intended user is not a
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+ programmer and does not plan to do
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+ any debugging on the system software, the system size can be decreased
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+ by about 90 MB by removing the debugging symbols from binaries and
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+ libraries. This causes no inconvenience other than not being able to
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+ debug the software fully anymore.</para-->
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+ <para>本节是可选的。如果系统不是为程序员设计的，
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+ 也没有调试系统软件的计划，可以通过从二进制程序和库移除调试符号，
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+ 将系统的体积减小约 90 MB 。除了无法再调试全部软件外，
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+ 这不会造成任何不便。</para>
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+
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+ <!--para>Most people who use the commands mentioned below do not
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+ experience any difficulties. However, it is easy to make a typo and
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+ render the new system unusable, so before running the
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+ <command>strip</command> commands, it is a good idea to make a
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+ backup of the LFS system in its current state.</para-->
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+ <para>大多数使用以下命令的用户不会遇到什么困难，但如果打错了命令，
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+ 很容易导致新系统无法使用。因此，在运行 <command>strip</command>
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+ 命令前，最好备份 LFS 系统的当前状态。</para>
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+
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+ <!--para>First place the debugging symbols for selected libraries
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+ in separate files. This debugging information is needed if running
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+ regression tests that use <ulink -->
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+ <para>首先将一些库的调试符号保存在单独的文件中，在 BLFS 中，
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+ 如果使用 <ulink
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+ url='&blfs-book;/general/valgrind.html'>valgrind</ulink> 或 <ulink
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+ url='&blfs-book;/general/gdb.html'>gdb</ulink> 运行退化测试，
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+ 则需要这些调试信息的存在。
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+ </para>
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+
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+<!-- also of interest are libgfortan, libgo, libgomp, and libobjc from gcc -->
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+
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+<!--<screen><userinput>save_lib="ld-2.25.so libc-2.25.so libpthread-2.25.so libthread_db-1.0.so"-->
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+<screen><userinput>save_lib="ld-&glibc-version;.so libc-&glibc-version;.so libpthread-&glibc-version;.so libthread_db-&libthread_db-version;.so"
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+
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+cd /lib
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+
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+for LIB in $save_lib; do
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+ objcopy --only-keep-debug $LIB $LIB.dbg
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+ strip --strip-unneeded $LIB
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+ objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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+done
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+
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+save_usrlib="libquadmath.so.&libquadmath-version; libstdc++.so.&libstdcpp-version;
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+ libmpx.so.&libmpx-version; libmpxwrappers.so.&libmpxwrap-version; libitm.so.&libitm-version;
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+ libatomic.so.&libatomic-version;" <!-- libcilkrts.so.&libcilkrts-version;-->
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+
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+cd /usr/lib
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+
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+for LIB in $save_usrlib; do
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+ objcopy --only-keep-debug $LIB $LIB.dbg
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+ strip --strip-unneeded $LIB
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+ objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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+done
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+
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+unset LIB save_lib save_usrlib</userinput></screen>
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+
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+ <!--para>Before performing the stripping, take special care to ensure that
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+ none of the binaries that are about to be stripped are running. If
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+ unsure whether the user entered chroot with the command given in
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+ <xref linkend="ch-system-chroot" role=","/> first exit from
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+ chroot:</para-->
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+ <para>在移除调试符号前，必须特别小心，
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+ 保证没有需要移除调试符号的二进制程序还在运行。
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+ 如果不确定是否使用 <xref linkend="ch-system-chroot"/>
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+ 中的命令进入了 chroot 环境，首先退出 chroot 环境：</para>
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+
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+<screen role="nodump"><userinput>logout</userinput></screen>
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+
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+ <para>然后再执行以下命令重新进入：</para>
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+
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+<screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
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+ HOME=/root TERM=$TERM \
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+ PS1='(lfs chroot) \u:\w\$ ' \
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+ PATH=/bin:/usr/bin:/sbin:/usr/sbin \
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+ /tools/bin/bash --login</userinput></screen>
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+
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+ <note><title>译注</title>
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+ <para>注意这里使用了 /tools/bin/bash 而不是 /bin/bash ，
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+ 因为 /bin 中的 bash 二进制文件将会被移除调试符号。
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+ 在 <xref linkend="ch-system-bash"/> 中我们执行了新编译的
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+ /bin/bash ，因此必须退出 chroot 环境，再以 /tools/bin/bash
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+ 为 shell 重新进入。之后使用的 /tools/bin/find 和
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+ /tools/bin/strip 同理。</para>
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+ </note>
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+
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+ <para>现在即可安全地移除程序和库的调试符号：</para>
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+
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+<screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
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+ -exec /tools/bin/strip --strip-debug {} ';'
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+
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+/tools/bin/find /lib /usr/lib -type f \( -name \*.so* -a ! -name \*dbg \) \
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+ -exec /tools/bin/strip --strip-unneeded {} ';'
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+
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+/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
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+ -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
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+
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+ <!--para>A large number of files will be reported as having their file
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+ format not recognized. These warnings can be safely ignored. These
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+ warnings indicate that those files are scripts instead of
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+ binaries.</para-->
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+ <para>这里会有很多文件被报告为格式无法识别，这些警告可以安全地忽略。
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+ 它们表明那些文件是脚本文件，而不是二进制文件。</para>
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+
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+</sect1>
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Bruce Dubbs