source: chapter08/strippingagain.xml@ be628b7

xry111/usr-move
Last change on this file since be628b7 was be628b7, checked in by Xi Ruoyao <xry111@…>, 21 months ago

usr-move: clean up stripping command

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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 2 GB 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_usrlib="ld-&glibc-version;.so libc-&glibc-version;.so libpthread-&glibc-version;.so libthread_db-&libthread_db-version;.so
37 libquadmath.so.&libquadmath-version; libstdc++.so.&libstdcpp-version;
38 libitm.so.&libitm-version; libatomic.so.&libatomic-version;" <!-- libcilkrts.so.&libcilkrts-version;-->
39
40cd /usr/lib
41
42for LIB in $save_usrlib; do
43 objcopy --only-keep-debug $LIB $LIB.dbg
44 strip --strip-unneeded $LIB
45 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
46done
47
48unset LIB save_usrlib</userinput></screen>
49
50<!-- <para>Before performing the stripping, take special care to ensure that
51 none of the binaries that are about to be stripped are running:</para>
52
53<screen role="nodump"><userinput>exec /tools/bin/bash</userinput></screen>
54
55 <para>Now the binaries and libraries can be safely stripped:</para>
56-->
57 <para>Now the binaries and libraries can be stripped:</para>
58<screen><userinput>find /usr/lib -type f -name \*.a \
59 -exec strip --strip-debug {} ';'
60
61find /usr/lib -type f -name \*.so* ! -name \*dbg \
62 -exec strip --strip-unneeded {} ';'
63
64find /usr/{bin,sbin,libexec} -type f \
65 -exec strip --strip-all {} ';'</userinput></screen>
66
67 <para>A large number of files will be reported as having their file
68 format not recognized. These warnings can be safely ignored. These
69 warnings indicate that those files are scripts instead of
70 binaries.</para>
71
72</sect1>
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