source: chapter06/strippingagain.xml@ 4dab071

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Last change on this file since 4dab071 was 4dab071, checked in by Ken Moffat <ken@…>, 5 years ago

Update some library versions hardcoded in Stripping Again.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11249 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

  • Property mode set to 100644
File size: 3.3 KB
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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>This section is optional. If the intended user is not a
14 programmer and does not plan to do
15 any debugging on the system software, the system size can be decreased
16 by about 90 MB by removing the debugging symbols from binaries and
17 libraries. This causes no inconvenience other than not being able to
18 debug the software fully anymore.</para>
19
20 <para>Most people who use the commands mentioned below do not
21 experience any difficulties. However, it is easy to make a typo and
22 render the new system unusable, so before running the
23 <command>strip</command> commands, it is a good idea to make a
24 backup of the LFS system in its current state.</para>
25
26 <para>First place the debugging symbols for selected libraries
27 in separate files. This debugging information is needed if running
28 regression tests that use <ulink
29 url='&blfs-book;/general/valgrind.html'>valgrind</ulink> or <ulink
30 url='&blfs-book;/general/gdb.html'>gdb</ulink> later in BLFS.
31 </para>
32
33<!-- also of interest are libgfortan, libgo, libgomp, and libobjc from gcc -->
34
35<screen><userinput>save_lib="ld-2.25.so libc-2.25.so libpthread-2.25.so libthread_db-1.0.so"
36
37cd /lib
38
39for LIB in $save_lib; do
40 objcopy --only-keep-debug $LIB $LIB.dbg
41 strip --strip-unneeded $LIB
42 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
43done
44
45save_usrlib="libquadmath.so.0.0.0 libstdc++.so.6.0.23
46 libmpx.so.2.0.1 libmpxwrappers.so.2.0.1 libitm.so.1.0.0
47 libcilkrts.so.5.0.0 libatomic.so.1.2.0"
48
49cd /usr/lib
50
51for LIB in $save_usrlib; do
52 objcopy --only-keep-debug $LIB $LIB.dbg
53 strip --strip-unneeded $LIB
54 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
55done
56
57unset LIB save_lib save_usrlib</userinput></screen>
58
59 <para>Before performing the stripping, take special care to ensure that
60 none of the binaries that are about to be stripped are running. If
61 unsure whether the user entered chroot with the command given in
62 <xref linkend="ch-system-chroot" role=","/> first exit from
63 chroot:</para>
64
65<screen role="nodump"><userinput>logout</userinput></screen>
66
67 <para>Then reenter it with:</para>
68
69<screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
70 HOME=/root TERM=$TERM PS1='\u:\w\$ ' \
71 PATH=/bin:/usr/bin:/sbin:/usr/sbin \
72 /tools/bin/bash --login</userinput></screen>
73
74 <para>Now the binaries and libraries can be safely stripped:</para>
75
76<screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
77 -exec /tools/bin/strip --strip-debug {} ';'
78
79/tools/bin/find /lib /usr/lib -type f \( -name \*.so* -a ! -name \*dbg \) \
80 -exec /tools/bin/strip --strip-unneeded {} ';'
81
82/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
83 -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
84
85 <para>A large number of files will be reported as having their file
86 format not recognized. These warnings can be safely ignored. These
87 warnings indicate that those files are scripts instead of
88 binaries.</para>
89
90</sect1>
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