source: chapter06/strippingagain.xml@ 55e25a9

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Last change on this file since 55e25a9 was 55e25a9, checked in by Bruce Dubbs <bdubbs@…>, 4 years ago

Update to bash-4.4.12.
Update to meson-0.43.0.
Update to python3-3.6.3.
Update to linux-4.13.7.
Update to binutils-2.29.1.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11309 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>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<screen><userinput>save_lib="ld-&glibc-version;.so libc-&glibc-version;.so libpthread-&glibc-version;.so libthread_db-&libthread_db-version;.so"
37
38cd /lib
39
40for LIB in $save_lib; do
41 objcopy --only-keep-debug $LIB $LIB.dbg
42 strip --strip-unneeded $LIB
43 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
44done
45
46save_usrlib="libquadmath.so.&libquadmath-version; libstdc++.so.&libstdcpp-version;
47 libmpx.so.&libmpx-version; libmpxwrappers.so.&libmpxwrap-version; libitm.so.&libitm-version;
48 libcilkrts.so.&libcilkrts-version; libatomic.so.&libatomic-version;"
49
50cd /usr/lib
51
52for LIB in $save_usrlib; do
53 objcopy --only-keep-debug $LIB $LIB.dbg
54 strip --strip-unneeded $LIB
55 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
56done
57
58unset LIB save_lib save_usrlib</userinput></screen>
59
60 <para>Before performing the stripping, take special care to ensure that
61 none of the binaries that are about to be stripped are running. If
62 unsure whether the user entered chroot with the command given in
63 <xref linkend="ch-system-chroot" role=","/> first exit from
64 chroot:</para>
65
66<screen role="nodump"><userinput>logout</userinput></screen>
67
68 <para>Then reenter it with:</para>
69
70<screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
71 HOME=/root TERM=$TERM \
72 PS1='(lfs chroot) \u:\w\$ ' \
73 PATH=/bin:/usr/bin:/sbin:/usr/sbin \
74 /tools/bin/bash --login</userinput></screen>
75
76 <para>Now the binaries and libraries can be safely stripped:</para>
77
78<screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
79 -exec /tools/bin/strip --strip-debug {} ';'
80
81/tools/bin/find /lib /usr/lib -type f \( -name \*.so* -a ! -name \*dbg \) \
82 -exec /tools/bin/strip --strip-unneeded {} ';'
83
84/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
85 -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
86
87 <para>A large number of files will be reported as having their file
88 format not recognized. These warnings can be safely ignored. These
89 warnings indicate that those files are scripts instead of
90 binaries.</para>
91
92</sect1>
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