source: chapter06/strippingagain.xml@ e039ed3

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Last change on this file since e039ed3 was e039ed3, checked in by Bruce Dubbs <bdubbs@…>, 5 years ago

Grammar

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11228 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-strippingagain">
9 <?dbhtml filename="strippingagain.html"?>
10
11 <title>Stripping Again</title>
12
13 <para>If the intended user is not a programmer and does not plan to do
14 any debugging on the system software, the system size can be decreased
15 by about 90 MB by removing the debugging symbols from binaries and
16 libraries. This causes no inconvenience other than not being able to
17 debug the software fully anymore.</para>
18
19 <para>Most people who use the command mentioned below do not
20 experience any difficulties. However, it is easy to make a typo and
21 render the new system unusable, so before running the
22 <command>strip</command> command, it is a good idea to make a
23 backup of the LFS system in its current state.</para>
24
25 <para>First back up some libraries whose debug symbols are needed when
26 running regression tests in BLFS packages:</para>
27
28<!-- also of interest are libgfortan, libgo, libgomp, and libobjc from gcc -->
29<screen><userinput>save_libs="ld- libatomic libc- libcilkrts libitm libmpx libpthread"
30save_libs="$save_libs libquadmath libsanitizer libstdc++ libthread_db libvtv"
31
32mkdir -p /var/dbg/lib /var/dbg/usr/lib
33
34for lib in $save_libs
35do
36 find /usr/lib -name ${lib}*so* -type f -exec cp {} /var/dbg/usr/lib \;
37 find /lib -name ${lib}*so* -type f -exec cp {} /var/dbg/lib \;
38done</userinput></screen>
39
40 <para>Before performing the stripping, take special care to ensure that
41 none of the binaries that are about to be stripped are running. If
42 unsure whether the user entered chroot with the command given in
43 <xref linkend="ch-system-chroot" role=","/> first exit from
44 chroot:</para>
45
46<screen role="nodump"><userinput>logout</userinput></screen>
47
48 <para>Then reenter it with:</para>
49
50<screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
51 HOME=/root TERM=$TERM PS1='\u:\w\$ ' \
52 PATH=/bin:/usr/bin:/sbin:/usr/sbin \
53 /tools/bin/bash --login</userinput></screen>
54
55 <para>Now the binaries and libraries can be safely stripped:</para>
56
57<screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
58 -exec /tools/bin/strip --strip-debug {} ';'
59
60/tools/bin/find /lib /usr/lib -type f -name \*.so* \
61 -exec /tools/bin/strip --strip-unneeded {} ';'
62
63/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
64 -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
65
66 <para>A large number of files will be reported as having their file
67 format not recognized. These warnings can be safely ignored. These
68 warnings indicate that those files are scripts instead of
69 binaries.</para>
70
71 <para>If desired, restore the saved libraries with the debug data
72 intact. The files can restored now or just held for later use. Note
73 that several of the files cannot be copied directly after rebooting
74 to the new LFS system. Later use requires booting to another system,
75 mounting the LFS partition, and then copying the files.</para>
76
77<screen><userinput>cp -av /var/dbg/lib/* /lib
78cp -av /var/dbg/usr/lib/* /usr/lib</userinput></screen>
79
80</sect1>
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