[3c928f1] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[81fd230] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[ddd5542] | 7 |
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[3c928f1] | 8 | <sect1 id="ch-system-strippingagain">
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[ddd5542] | 9 | <?dbhtml filename="strippingagain.html"?>
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| 10 |
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| 11 | <title>Stripping Again</title>
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| 12 |
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[c32384e] | 13 | <para>This section is optional. If the intended user is not a
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| 14 | programmer and does not plan to do
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[ddd5542] | 15 | any debugging on the system software, the system size can be decreased
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[0b37960] | 16 | by about 90 MB by removing the debugging symbols from binaries and
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[ddd5542] | 17 | libraries. This causes no inconvenience other than not being able to
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| 18 | debug the software fully anymore.</para>
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| 19 |
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[826bbcc] | 20 | <para>Most people who use the commands mentioned below do not
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[ddd5542] | 21 | experience any difficulties. However, it is easy to make a typo and
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| 22 | render the new system unusable, so before running the
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[826bbcc] | 23 | <command>strip</command> commands, it is a good idea to make a
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[ddd5542] | 24 | backup of the LFS system in its current state.</para>
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| 25 |
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[826bbcc] | 26 | <para>First place the debugging symbols for selected libraries
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[c32384e] | 27 | in separate files. This debugging information is needed if running
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| 28 | regression tests that use <ulink
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[826bbcc] | 29 | url='&blfs-book;/general/valgrind.html'>valgrind</ulink> or <ulink
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| 30 | url='&blfs-book;/general/gdb.html'>gdb</ulink> later in BLFS.
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[c32384e] | 31 | </para>
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[6c8a79a] | 32 |
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[72031fe0] | 33 | <!-- also of interest are libgfortan, libgo, libgomp, and libobjc from gcc -->
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[6c8a79a] | 34 |
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[c32384e] | 35 | <screen><userinput>save_lib="ld-2.25.so libc-2.25.so libpthread-2.25.so libthread_db-1.0.so"
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[6c8a79a] | 36 |
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[c32384e] | 37 | cd /lib
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| 38 |
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| 39 | for LIB in $save_lib; do
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| 40 | objcopy --only-keep-debug $LIB $LIB.dbg
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| 41 | strip --strip-unneeded $LIB
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| 42 | objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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| 43 | done
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| 44 |
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[c3b79ee2] | 45 | save_usrlib="libquadmath.so.0.0.0 libstdc++.so.6.0.22
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[c32384e] | 46 | libmpx.so.2.0.0 libmpxwrappers.so.2.0.0 libitm.so.1.0.0
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| 47 | libcilkrts.so.5.0.0 libatomic.so.1.2.0"
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| 48 |
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| 49 | cd /usr/lib
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| 50 |
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| 51 | for LIB in $save_usrlib; do
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| 52 | objcopy --only-keep-debug $LIB $LIB.dbg
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| 53 | strip --strip-unneeded $LIB
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| 54 | objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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| 55 | done
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| 56 |
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| 57 | unset LIB save_lib save_usrlib</userinput></screen>
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[6c8a79a] | 58 |
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[ddd5542] | 59 | <para>Before performing the stripping, take special care to ensure that
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| 60 | none of the binaries that are about to be stripped are running. If
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| 61 | unsure whether the user entered chroot with the command given in
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| 62 | <xref linkend="ch-system-chroot" role=","/> first exit from
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| 63 | chroot:</para>
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[3c928f1] | 64 |
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[dde039d] | 65 | <screen role="nodump"><userinput>logout</userinput></screen>
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[3c928f1] | 66 |
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[ddd5542] | 67 | <para>Then reenter it with:</para>
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[3c928f1] | 68 |
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[3dc9543] | 69 | <screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
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[3c928f1] | 70 | HOME=/root TERM=$TERM PS1='\u:\w\$ ' \
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[3dc9543] | 71 | PATH=/bin:/usr/bin:/sbin:/usr/sbin \
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[3c928f1] | 72 | /tools/bin/bash --login</userinput></screen>
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| 73 |
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[ddd5542] | 74 | <para>Now the binaries and libraries can be safely stripped:</para>
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[3c928f1] | 75 |
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[4d97563] | 76 | <screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
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[05797fe] | 77 | -exec /tools/bin/strip --strip-debug {} ';'
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| 78 |
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[c32384e] | 79 | /tools/bin/find /lib /usr/lib -type f \(-name \*.so* -a ! -name \*dbg\) \
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[05797fe] | 80 | -exec /tools/bin/strip --strip-unneeded {} ';'
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| 81 |
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| 82 | /tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
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| 83 | -exec /tools/bin/strip --strip-all {} ';'</userinput></screen>
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[3c928f1] | 84 |
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[ddd5542] | 85 | <para>A large number of files will be reported as having their file
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| 86 | format not recognized. These warnings can be safely ignored. These
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| 87 | warnings indicate that those files are scripts instead of
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| 88 | binaries.</para>
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[6c8a79a] | 89 |
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[3c928f1] | 90 | </sect1>
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