| 1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
|---|
| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" |
|---|
| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ |
|---|
| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
|---|
| 5 | %general-entities; |
|---|
| 6 | ]> |
|---|
| 7 | |
|---|
| 8 | <sect1 id="ch-system-stripping"> |
|---|
| 9 | <?dbhtml filename="stripping.html"?> |
|---|
| 10 | |
|---|
| 11 | <title>Stripping</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 200 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 current situation.</para> |
|---|
| 24 | |
|---|
| 25 | <para>Before performing the stripping, take special care to ensure that |
|---|
| 26 | none of the binaries that are about to be stripped are running. If |
|---|
| 27 | unsure whether the user entered chroot with the command given in |
|---|
| 28 | <xref linkend="chapter-chroot" role=","/> first exit from |
|---|
| 29 | chroot:</para> |
|---|
| 30 | |
|---|
| 31 | <screen><userinput>logout</userinput></screen> |
|---|
| 32 | |
|---|
| 33 | <para>Then reenter it with:</para> |
|---|
| 34 | |
|---|
| 35 | <screen><userinput>chroot $LFS /tools/bin/env -i \ |
|---|
| 36 | HOME=/root TERM=$TERM PS1='\u:\w\$ ' \ |
|---|
| 37 | PATH=/bin:/usr/bin:/sbin:/usr/sbin \ |
|---|
| 38 | /tools/bin/bash --login</userinput></screen> |
|---|
| 39 | |
|---|
| 40 | <para>Now the binaries and libraries can be safely stripped:</para> |
|---|
| 41 | |
|---|
| 42 | <screen><userinput>/tools/bin/find /{,usr/}{bin,lib,sbin} -type f \ |
|---|
| 43 | -exec /tools/bin/strip --strip-debug '{}' ';'</userinput></screen> |
|---|
| 44 | |
|---|
| 45 | <para>A large number of files will be reported as having their file |
|---|
| 46 | format not recognized. These warnings can be safely ignored. These |
|---|
| 47 | warnings indicate that those files are scripts instead of |
|---|
| 48 | binaries.</para> |
|---|
| 49 | |
|---|
| 50 | <para>If disk space is very tight, the <option>--strip-all</option> |
|---|
| 51 | option can be used on the binaries in <filename |
|---|
| 52 | class="directory">/{,usr/}{bin,sbin}</filename> to gain several more |
|---|
| 53 | megabytes. Do not use this option on libraries—they will be |
|---|
| 54 | destroyed.</para> |
|---|
| 55 | |
|---|
| 56 | </sect1> |
|---|
