source: chapter08/strippingagain.xml@ 0ebda11

ml-11.0 multilib
Last change on this file since 0ebda11 was 0ebda11, checked in by Thomas Trepl (Moody) <thomas@…>, 15 months ago

Remove entities for multilib pathes
Add usage of libc_cv_rtlddir

  • Property mode set to 100644
File size: 3.9 KB
Line 
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
41for LIB in $save_usrlib; do
42 objcopy --only-keep-debug $LIB $LIB.dbg
43 strip --strip-unneeded $LIB
44 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
45done</userinput>
46<userinput arch="ml_32,ml_all">
47cd /usr/lib32
48for LIB in $save_usrlib; do
49 objcopy --only-keep-debug $LIB $LIB.dbg
50 strip --strip-unneeded $LIB
51 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
52done</userinput>
53<userinput arch="ml_x32,ml_all">
54cd /usr/libx32
55for LIB in $save_usrlib; do
56 objcopy --only-keep-debug $LIB $LIB.dbg
57 strip --strip-unneeded $LIB
58 objcopy --add-gnu-debuglink=$LIB.dbg $LIB
59done</userinput><userinput>
60
61unset LIB save_usrlib</userinput></screen>
62
63<!-- <para>Before performing the stripping, take special care to ensure that
64 none of the binaries that are about to be stripped are running:</para>
65
66<screen role="nodump"><userinput>exec /tools/bin/bash</userinput></screen>
67
68 <para>Now the binaries and libraries can be safely stripped:</para>
69-->
70 <para>Now the binaries and libraries can be stripped:</para>
71<screen><userinput>find /usr/lib -type f -name \*.a \
72 -exec strip --strip-debug {} ';'</userinput>
73<userinput arch="ml_32,ml_all">find /usr/lib32 -type f -name \*.a \
74 -exec strip --strip-debug {} ';'</userinput>
75<userinput arch="ml_x32,ml_all">find /usr/libx32 -type f -name \*.a \
76 -exec strip --strip-debug {} ';'</userinput><userinput>
77
78find /usr/lib -type f -name \*.so* ! -name \*dbg \
79 -exec strip --strip-unneeded {} ';'</userinput>
80<userinput arch="ml_32,ml_all">find /usr/lib32 -type f -name \*.so* ! -name \*dbg \
81 -exec strip --strip-unneeded {} ';'</userinput>
82<userinput arch="ml_x32,ml_all">find /usr/libx32 -type f -name \*.so* ! -name \*dbg \
83 -exec strip --strip-unneeded {} ';'</userinput><userinput>
84
85find /usr/{bin,sbin,libexec} -type f \
86 -exec strip --strip-all {} ';'</userinput></screen>
87
88 <para>A large number of files will be reported as having their file
89 format not recognized. These warnings can be safely ignored. These
90 warnings indicate that those files are scripts instead of
91 binaries.</para>
92
93</sect1>
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