source: chapter06/strippingagain.xml@ 8eb3fe4

multilib-10.1 multilib-before-cross
Last change on this file since 8eb3fe4 was 8eb3fe4, checked in by Thomas Trepl <thomas@…>, 3 years ago

First apply of multilib-patch of April 1st, 2019

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/multilib@11566 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 arch="default"><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 libitm.so.&libitm-version; libatomic.so.&libatomic-version;" <!-- libcilkrts.so.&libcilkrts-version;-->
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<screen arch="multilib"><userinput>save_lib="ld-&glibc-version;.so libc-&glibc-version;.so libpthread-&glibc-version;.so libthread_db-&libthread_db-version;.so"
60
61cd /lib
62
63for LIB in $save_lib; do
64 objcopy --only-keep-debug $LIB $LIB.dbg
65 strip --strip-unneeded $LIB
66 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
67done
68
69save_usrlib="libquadmath.so.&libquadmath-version; libstdc++.so.&libstdcpp-version;
70 libitm.so.&libitm-version; libatomic.so.&libatomic-version;" <!-- libcilkrts.so.&libcilkrts-version;-->
71
72for libdir in /usr/lib{,{,x}32}; do
73 cd $libdir
74 for LIB in $save_usrlib; do
75 objcopy --only-keep-debug $LIB $LIB.dbg
76 strip --strip-unneeded $LIB
77 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
78 done
79done
80
81unset LIB save_lib save_usrlib</userinput></screen>
82
83 <para>Before performing the stripping, take special care to ensure that
84 none of the binaries that are about to be stripped are running:</para>
85
86<screen role="nodump"><userinput>exec /tools/bin/bash</userinput></screen>
87
88 <!--
89 If
90 unsure whether the user entered chroot with the command given in
91 <xref linkend="ch-system-chroot" role=","/> first use the version
92 of bash we created in
93 chroot:</para>
94
95<screen role="nodump"><userinput>logout</userinput></screen>
96
97 <para>Then reenter it with:</para>
98
99<screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
100 HOME=/root TERM=$TERM \
101 PS1='(lfs chroot) \u:\w\$ ' \
102 PATH=/bin:/usr/bin:/sbin:/usr/sbin \
103 /tools/bin/bash - -login</userinput></screen>-->
104
105 <para>Now the binaries and libraries can be safely stripped:</para>
106
107<screen arch="default"><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
108 -exec /tools/bin/strip --strip-debug {} ';'
109
110/tools/bin/find /lib /usr/lib -type f \( -name \*.so* -a ! -name \*dbg \) \
111 -exec /tools/bin/strip --strip-unneeded {} ';'
112
113/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
114 -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
115
116<screen arch="multilib"><userinput>/tools/bin/find /usr/lib{,{,x}32} -type f -name \*.a \
117 -exec /tools/bin/strip --strip-debug {} ';'
118
119/tools/bin/find /lib /usr/lib{,{,x}32} -type f \( -name \*.so* -a ! -name \*dbg \) \
120 -exec /tools/bin/strip --strip-unneeded {} ';'
121
122/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
123 -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
124
125 <para>A large number of files will be reported as having their file
126 format not recognized. These warnings can be safely ignored. These
127 warnings indicate that those files are scripts instead of
128 binaries.</para>
129
130</sect1>
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