1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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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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-tools-stripping">
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9 | <?dbhtml filename="stripping.html"?>
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10 |
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11 | <title>Cleaning up and Saving the Temporary System</title>
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12 |
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13 | <para>The libtool .la files are only useful when linking with static
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14 | libraries. They are unneeded, and potentially harmful, when using dynamic
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15 | shared libraries, specially when using non-autotools build systems.
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16 | While still in chroot, remove those files now:</para>
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17 |
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18 | <screen arch="default"><userinput>find /usr/{lib,libexec} -name \*.la -delete</userinput></screen>
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19 | <screen arch="ml_32"><userinput>find /usr/{lib{,32},libexec} -name \*.la -delete</userinput></screen>
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20 | <screen arch="ml_x32"><userinput>find /usr/{lib{,x32},libexec} -name \*.la -delete</userinput></screen>
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21 | <screen arch="ml_all"><userinput>find /usr/{lib{,{,x}32},libexec} -name \*.la -delete</userinput></screen>
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22 |
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23 | <para>Remove the documentation of the temporary tools, to prevent them
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24 | from ending up in the final system, and save about 35 MB:</para>
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25 |
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26 | <screen><userinput>rm -rf /usr/share/{info,man,doc}/*</userinput></screen>
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27 |
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28 | <note><para>
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29 | All the remaining steps in this section are optional. Nevertheless,
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30 | as soon as you begin installing packages in <xref
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31 | linkend="chapter-building-system"/>, the temporary tools will be
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32 | overwritten. So it may be a good idea to do a backup of the temporary
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33 | tools as described below. The other steps are only needed if you are
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34 | really short on disk space.
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35 | </para></note>
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36 |
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37 | <para>
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38 | The following steps are performed from outside the chroot
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39 | environment. That means, you have to leave the chroot environment
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40 | first before continuing. The reason for that is to:
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41 | <itemizedlist>
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42 | <listitem>
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43 | <para>
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44 | make sure that objects are not in use while they are
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45 | manipulated.
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46 | </para>
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47 | </listitem>
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48 | <listitem>
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49 | <para>
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50 | get access to file system locations outside of the chroot
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51 | environment to store/read the backup archive which should
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52 | not be placed within the
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53 | <filename class="directory">$LFS</filename> hierarchy for
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54 | safety reasons.
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55 | </para>
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56 | </listitem>
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57 | </itemizedlist>
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58 | </para>
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59 |
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60 | <para>
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61 | Leave the chroot environment and unmount the kernel virtual file
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62 | systems:
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63 | </para>
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64 |
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65 | <note>
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66 | <para>All of the following instructions are executed by
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67 | <systemitem class="username">root</systemitem>. Take extra
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68 | care about the commands you're going to run as mistakes
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69 | here can modify your host system. Be aware that the
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70 | environment variable <envar>LFS</envar> is set for user
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71 | <systemitem class="username">lfs</systemitem> by default
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72 | but it might <emphasis>not</emphasis> be set for
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73 | <systemitem class="username">root</systemitem>. Whenever
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74 | commands are to be executed by <systemitem class="username">root</systemitem>,
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75 | make sure you have set <envar>LFS</envar> accordingly.
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76 | This has been discussed in <xref linkend='ch-partitioning-aboutlfs'/>.
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77 | </para>
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78 | </note>
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79 |
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80 | <screen role="nodump"><userinput>exit
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81 | umount $LFS/dev{/pts,}
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82 | umount $LFS/{sys,proc,run}</userinput></screen>
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83 |
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84 | <sect2>
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85 | <title>Stripping</title>
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86 |
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87 | <para>If the LFS partition is rather small, it is good to
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88 | know that unnecessary items can be removed. The executables and
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89 | libraries built so far contain a little over 90 MB of unneeded debugging
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90 | symbols.</para>
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91 |
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92 | <para>Strip off debugging symbols from binaries:</para>
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93 | <screen arch="default" role="nodump"><userinput>strip --strip-debug $LFS/usr/lib/*
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94 | strip --strip-unneeded $LFS/usr/{,s}bin/*
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95 | strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
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96 | <screen arch="ml_32" role="nodump"><userinput>strip --strip-debug $LFS/usr/lib{,32}/*
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97 | strip --strip-unneeded $LFS/usr/{,s}bin/*
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98 | strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
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99 | <screen arch="ml_x32" role="nodump"><userinput>strip --strip-debug $LFS/usr/lib{,x32}/*
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100 | strip --strip-unneeded $LFS/usr/{,s}bin/*
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101 | strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
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102 | <screen arch="ml_all" role="nodump"><userinput>strip --strip-debug $LFS/usr/lib{,{,x}32}/*
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103 | strip --strip-unneeded $LFS/usr/{,s}bin/*
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104 | strip --strip-unneeded $LFS/tools/bin/*</userinput></screen>
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105 |
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106 | <para>These commands will skip a number of files reporting that it does not
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107 | recognize their file format. Most of these are scripts instead of binaries.
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108 | <!--Note that we use the <command>strip</command> program built in
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109 | <quote>Binutils pass 2</quote>, since it is the one that knows how to strip
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110 | our cross-compiled programs.--></para>
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111 |
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112 | <para>Take care <emphasis>NOT</emphasis> to use
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113 | <parameter>--strip-unneeded</parameter> on the libraries. The static
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114 | ones would be destroyed and the toolchain packages would need to be
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115 | built all over again.</para>
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116 |
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117 | <para>At this point, you should have at least 5 GB of free space on the
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118 | chroot partition that can be used to build and install Glibc and GCC in
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119 | the next phase. If you can build and install Glibc, you can build and install
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120 | the rest too. You can check the free disk space with the command
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121 | <command>df -h $LFS</command>.</para>
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122 |
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123 | </sect2>
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124 |
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125 | <sect2>
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126 | <title>Backup</title>
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127 |
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128 | <para>
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129 | Now that the essential tools have been created, its time to think about
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130 | a backup. When every check has passed successfully in the previously
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131 | built packages, your temporary tools are in a good state and might be
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132 | backed up for later reuse. In case of fatal failures in the subsequent
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133 | chapters, it often turns out that removing everything and starting over
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134 | (more carefully) is the best option to recover. Unfortunately, all the
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135 | temporary tools will be removed, too. To avoid spending extra time to
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136 | redo something which has been built successfully, prepare a backup.
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137 | </para>
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138 |
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139 | <para>
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140 | Make sure you have at least 600 MB free disk space (the source tarballs
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141 | will be included in the backup archive) in the home directory of user
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142 | <systemitem class="username">root</systemitem>.
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143 | </para>
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144 |
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145 | <para>
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146 | Create the backup archive by running the following command:
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147 | </para>
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148 |
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149 | <screen role="nodump" revision="sysv"><userinput>cd $LFS &&
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150 | tar -cJpf $HOME/lfs-temp-tools-&version;.tar.xz .</userinput></screen>
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151 |
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152 | <screen role="nodump" revision="systemd"><userinput>cd $LFS &&
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153 | tar -cJpf $HOME/lfs-temp-tools-&versiond;.tar.xz .</userinput></screen>
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154 |
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155 | <para>
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156 | Replace <envar>$HOME</envar> by a directory of your choice if you
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157 | do not want to have the backup stored in <systemitem
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158 | class="username">root</systemitem>'s home directory.
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159 | </para>
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160 | </sect2>
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161 |
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162 | <sect2>
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163 | <title>Restore</title>
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164 |
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165 | <para>
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166 | In case some mistakes have been made and you need to start over, you can
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167 | use this backup to restore the temporary tools and save some recovery time.
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168 | Since the sources are located under
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169 | <filename class="directory">$LFS</filename>, they are included in the
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170 | backup archive as well, so they do not need to be downloaded again. After
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171 | checking that <envar>$LFS</envar> is set properly,
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172 | restore the backup by executing the following commands:
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173 | </para>
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174 |
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175 | <!-- Make the following look different so users don't blindly run the
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176 | restore when they don't need to. -->
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177 |
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178 | <screen role="nodump" revision="sysv"><computeroutput>cd $LFS &&
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179 | rm -rf ./* &&
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180 | tar -xpf $HOME/lfs-temp-tools-&version;.tar.xz</computeroutput></screen>
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181 |
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182 | <screen role="nodump" revision="systemd"><computeroutput>cd $LFS &&
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183 | rm -rf ./* &&
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184 | tar -xpf $HOME/lfs-temp-tools-&versiond;.tar.xz</computeroutput></screen>
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185 |
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186 | <para>
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187 | Again, double check that the environment has been setup properly
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188 | and continue building the rest of the system.
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189 | </para>
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190 |
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191 | <important>
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192 | <para>
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193 | If you left the chroot environment either to strip off debug
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194 | symbols, create a backup, or restart building using a restore,
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195 | remember to mount the kernel virtual filesystems now again as
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196 | described in <xref linkend='ch-tools-kernfs'/> and re-enter
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197 | the chroot environment (see <xref linkend='ch-tools-chroot'/>)
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198 | again before continuing.
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199 | </para>
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200 | </important>
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201 |
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202 | </sect2>
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203 |
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204 | </sect1>
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