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-tools-stripping">
|
---|
9 | <?dbhtml filename="stripping.html"?>
|
---|
10 |
|
---|
11 | <title>Finishing Temporary Tools</title>
|
---|
12 |
|
---|
13 | <para>
|
---|
14 | The steps in this section are optional. Skip this section entirely
|
---|
15 | if you are not really short on disk space and do not want to create
|
---|
16 | a backup of the temporary tools.
|
---|
17 | </para>
|
---|
18 |
|
---|
19 | <sect2>
|
---|
20 | <title>Stripping</title>
|
---|
21 |
|
---|
22 | <para>If the LFS partition is rather small, it is beneficial to
|
---|
23 | learn that unnecessary items can be removed.
|
---|
24 | The executables and libraries built so far contain about 70 MB of unneeded
|
---|
25 | debugging symbols.</para>
|
---|
26 |
|
---|
27 | <screen><userinput>strip --strip-debug /usr/lib/*
|
---|
28 | strip --strip-unneeded /usr/{,s}bin/*
|
---|
29 | strip --strip-unneeded /tools/bin/*</userinput></screen>
|
---|
30 |
|
---|
31 | <para>These commands will skip a number of files reporting that it does not
|
---|
32 | recognize their file format. Most of these are scripts instead of binaries.
|
---|
33 | <!--Note that we use the <command>strip</command> program built in
|
---|
34 | <quote>Binutils pass 1</quote>, since it is the one that knows how to strip
|
---|
35 | our cross-compiled programs.--></para>
|
---|
36 |
|
---|
37 | <para>Take care <emphasis>NOT</emphasis> to use
|
---|
38 | <parameter>--strip-unneeded</parameter> on the libraries. The static
|
---|
39 | ones would be destroyed and the toolchain packages would need to be
|
---|
40 | built all over again.</para>
|
---|
41 |
|
---|
42 | <para>To save more space, remove the documentation:</para>
|
---|
43 |
|
---|
44 | <screen><userinput>rm -rf /usr/{,share}/{info,man,doc}</userinput></screen>
|
---|
45 |
|
---|
46 | <para>The libtool .la files are only useful when linking with static
|
---|
47 | libraries. They are unneeded, and potentially harmful, when using dynamic
|
---|
48 | shared libraries, specially when using non-autotools build systems.
|
---|
49 | Remove those files now:</para>
|
---|
50 |
|
---|
51 | <screen><userinput>find /usr/{lib,libexec} -name \*.la -delete</userinput></screen>
|
---|
52 |
|
---|
53 | <para>At this point, you should have at least 5 GB of free space on the
|
---|
54 | chroot partition that can be used to build and install Glibc and Gcc in
|
---|
55 | the next phase. If you can build and install Glibc, you can build and install
|
---|
56 | the rest too. You can check the free disk space with the command
|
---|
57 | <command>df -h /</command>.</para>
|
---|
58 |
|
---|
59 | </sect2>
|
---|
60 |
|
---|
61 | <sect2>
|
---|
62 | <title>Backup / Restore</title>
|
---|
63 |
|
---|
64 | <para>
|
---|
65 | Now that the essential tools have been created, its time to think about
|
---|
66 | a backup. When every check has passed successfully in the previously
|
---|
67 | built packages, your temporary tools are in a good state and might be
|
---|
68 | backed up for later reuse. In case of fatal failures in the subsequent
|
---|
69 | chapters, it often turns out that removing everything and starting over
|
---|
70 | (more carefully) is the best option to recover. Unfortunatly, all the
|
---|
71 | temporary tools will be removed, too. To avoid the extra time needed to redo
|
---|
72 | something which has been built successfully, prepare a backup.
|
---|
73 | </para>
|
---|
74 |
|
---|
75 | <para>
|
---|
76 | Leave the chroot environment and make sure you have at least
|
---|
77 | 600 MB free disk space (the source tarballs will be included in
|
---|
78 | the backup archive) in the home directory of user
|
---|
79 | <systemitem class="username">lfs</systemitem>. Leaving the
|
---|
80 | chroot environment is required as the backup should be stored
|
---|
81 | outside of the <filename class="directory">$LFS</filename> directory
|
---|
82 | but those cannot be accessed when in chroot. Leave the chroot environment
|
---|
83 | and unmount the virtual kernel filesystems:
|
---|
84 | </para>
|
---|
85 |
|
---|
86 | <screen role="nodump"><userinput>exit
|
---|
87 | umount $LFS/dev{/pts,}
|
---|
88 | umount $LFS/{sys,proc,run}</userinput></screen>
|
---|
89 |
|
---|
90 | <para>Create the backup archive:</para>
|
---|
91 | <screen role="nodump"><userinput>cd $LFS &&
|
---|
92 | tar -cJpf $HOME/temp-tools.tar.xz .
|
---|
93 | </userinput></screen>
|
---|
94 |
|
---|
95 | <para>
|
---|
96 | In case some mistakes have been made and you need to start over, you can
|
---|
97 | use this backup to restore the temporary tools and save some irecovery time.
|
---|
98 | Since the sources are located under
|
---|
99 | <filename class="directory">$LFS</filename>, they are included in the
|
---|
100 | backup archive as well, so you need not to download them again. After
|
---|
101 | checking that <filename class="directory">$LFS</filename> is set properly,
|
---|
102 | restore the backup by executing the following commands:
|
---|
103 | </para>
|
---|
104 |
|
---|
105 | <screen role="nodump"><userinput>cd $LFS &&
|
---|
106 | rm -rf ./* &&
|
---|
107 | tar -xpf $HOME/temp-tools.tar.xz
|
---|
108 | </userinput></screen>
|
---|
109 |
|
---|
110 | <para>
|
---|
111 | Again, double check that the environment has been setup properly
|
---|
112 | and continue building the rest of the system.
|
---|
113 | </para>
|
---|
114 |
|
---|
115 | <important>
|
---|
116 | <para>
|
---|
117 | If you left the chroot environment either to create a backup
|
---|
118 | or restart building using a restore, remember to mount the
|
---|
119 | kernel virtual filesystems as described in <xref
|
---|
120 | linkend='ch-tools-kernfs'/> and re-enter the
|
---|
121 | chroot environment (see <xref
|
---|
122 | linkend='ch-tools-chroot'/>) again before continuing.</para>
|
---|
123 | </important>
|
---|
124 |
|
---|
125 | </sect2>
|
---|
126 |
|
---|
127 | </sect1>
|
---|