| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-stripping">
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| 9 | <?dbhtml filename="stripping.html"?>
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| 10 |
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| 11 | <title>Stripping</title>
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| 12 |
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| 13 | <para os="a">If the intended user is not a programmer and does not plan to do
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| 14 | any debugging on the system software, the system size can be decreased
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| 15 | by about 200 MB by removing the debugging symbols from binaries and
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| 16 | libraries. This causes no inconvenience other than not being able to
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| 17 | debug the software fully anymore.</para>
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| 18 |
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| 19 | <para os="b">Most people who use the command mentioned below do not
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| 20 | experience any difficulties. However, it is easy to make a typo and
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| 21 | render the new system unusable, so before running the
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| 22 | <command>strip</command> command, it is a good idea to make a
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| 23 | backup of the current situation.</para>
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| 24 |
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| 25 | <para os="c">Before performing the stripping, take special care to ensure that
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| 26 | none of the binaries that are about to be stripped are running. If
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| 27 | unsure whether the user entered chroot with the command given in
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| 28 | <xref linkend="chapter-chroot" role=","/> first exit from
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| 29 | chroot:</para>
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| 30 |
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| 31 | <screen os="d" role="nodump"><userinput>logout</userinput></screen>
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| 32 |
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| 33 | <para os="e">Then reenter it with:</para>
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| 34 |
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| 35 | <screen os="f" role="nodump"><userinput>chroot ${CLFS} /tools/bin/env -i \
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| 36 | HOME=/root TERM=${TERM} PS1='\u:\w\$ ' \
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| 37 | PATH=/bin:/usr/bin:/sbin:/usr/sbin \
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| 38 | /tools/bin/bash --login</userinput></screen>
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| 39 |
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| 40 | <para os="g">Now the binaries and libraries can be safely stripped:</para>
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| 41 |
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| 42 | <screen os="h"><userinput>/tools/bin/find /{,usr/}{bin,lib,sbin} -type f \
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| 43 | -exec /tools/bin/strip --strip-debug '{}' ';'</userinput></screen>
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| 44 |
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| 45 | <para os="i">A large number of files will be reported as having their file
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| 46 | format not recognized. These warnings can be safely ignored. These
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| 47 | warnings indicate that those files are scripts instead of
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| 48 | binaries.</para>
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| 49 |
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| 50 | <para os="j">If disk space is very tight, the <option>--strip-all</option>
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| 51 | option can be used on the binaries in <filename
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| 52 | class="directory">/{,usr/}{bin,sbin}</filename> to gain several more
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| 53 | megabytes. Do not use this option on libraries—they will be
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| 54 | destroyed.</para>
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| 55 |
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| 56 | </sect1>
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