strippingagain.xml 2.3 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
  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. <sect1 id="ch-system-strippingagain">
  8. <?dbhtml filename="strippingagain.html"?>
  9. <title>Stripping Again</title>
  10. <para>If the intended user is not a programmer and does not plan to do
  11. any debugging on the system software, the system size can be decreased
  12. by about 90 MB by removing the debugging symbols from binaries and
  13. libraries. This causes no inconvenience other than not being able to
  14. debug the software fully anymore.</para>
  15. <para>Most people who use the command mentioned below do not
  16. experience any difficulties. However, it is easy to make a typo and
  17. render the new system unusable, so before running the
  18. <command>strip</command> command, it is a good idea to make a
  19. backup of the LFS system in its current state.</para>
  20. <para>Before performing the stripping, take special care to ensure that
  21. none of the binaries that are about to be stripped are running. If
  22. unsure whether the user entered chroot with the command given in
  23. <xref linkend="ch-system-chroot" role=","/> first exit from
  24. chroot:</para>
  25. <screen role="nodump"><userinput>logout</userinput></screen>
  26. <para>Then reenter it with:</para>
  27. <screen role="nodump"><userinput>chroot $LFS /tools/bin/env -i \
  28. HOME=/root TERM=$TERM PS1='\u:\w\$ ' \
  29. PATH=/bin:/usr/bin:/sbin:/usr/sbin \
  30. /tools/bin/bash --login</userinput></screen>
  31. <para>Now the binaries and libraries can be safely stripped:</para>
  32. <screen><userinput>/tools/bin/find /{,usr/}{bin,lib,sbin} -type f \
  33. -exec /tools/bin/strip --strip-debug '{}' ';'</userinput></screen>
  34. <para>A large number of files will be reported as having their file
  35. format not recognized. These warnings can be safely ignored. These
  36. warnings indicate that those files are scripts instead of
  37. binaries.</para>
  38. <para>If disk space is very tight, the
  39. <parameter>--strip-all</parameter> option can be used on the binaries
  40. in <filename class="directory">/{,usr/}{bin,sbin}</filename> to gain
  41. several more megabytes. Do not use this option on libraries&mdash;they will
  42. be destroyed.</para>
  43. </sect1>