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author | Matthew Burgess <matthew@linuxfromscratch.org> | 2004-05-03 10:59:46 +0000 |
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committer | Matthew Burgess <matthew@linuxfromscratch.org> | 2004-05-03 10:59:46 +0000 |
commit | 673b0d84ba9591e07c0bdf0ee49d92eba10f502c (patch) | |
tree | 129e27a1450727b440da4378e0117a468eb9c25e /chapter06/chapter06.xml | |
parent | 287ea55da70ceb1f0990554b7db921d525fef816 (diff) |
* Merged newxml into HEAD
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3435 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter06/chapter06.xml')
-rw-r--r-- | chapter06/chapter06.xml | 717 |
1 files changed, 157 insertions, 560 deletions
diff --git a/chapter06/chapter06.xml b/chapter06/chapter06.xml index 953fb3233..0de12cb7a 100644 --- a/chapter06/chapter06.xml +++ b/chapter06/chapter06.xml @@ -1,569 +1,202 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [ + <!ENTITY % general-entities SYSTEM "../general.ent"> + %general-entities; +]> <chapter id="chapter-building-system" xreflabel="Chapter 6"> +<?dbhtml dir="chapter06"?> <title>Installing basic system software</title> -<?dbhtml filename="chapter06.html" dir="chapter06"?> - - -<sect1 id="ch-system-introduction"> -<title>Introduction</title> -<?dbhtml filename="introduction.html" dir="chapter06"?> - -<para>In this chapter we enter the building site, and start -constructing our LFS system in earnest. That is, we chroot into -our temporary mini Linux system, create some auxiliary things, -and then start installing all the packages, one by one.</para> - -<para>The installation of all this software is pretty straightforward, -and you will probably think it would be much shorter to give here -the generic installation instructions and explain in full only the -installation of those packages that require an alternate method. -Although we agree with that, we nevertheless choose to give the -full instructions for each and every package, simply to minimize -the possibilities for mistakes.</para> - -<para>The key to learning what makes a Linux system work is to know -what each package is used for and why the user (or the system) needs it. -For this purpose for every installed package a summary of its content is -given followed by concise descriptions of each program and library it -installed.</para> - -<para>If you plan to use compiler optimizations in this chapter, take a look at -the optimization hint at <ulink url="&hints-root;optimization.txt"/>. Compiler -optimizations can make a program run slightly faster, but they may also cause -compilation difficulties and even problems when running the program. If a -package refuses to compile when using optimization, try to compile it without -optimization and see if the problem goes away. Even if the package does compile -when using optimization, there is the risk it may have been compiled incorrectly -due to complex interactions between the code and build tools. In short, the -small potential gains achieved in using compiler optimization are generally -outweighed by the risk. First time builders of LFS are encouraged to build -without custom optimizations. Your system will still be very fast and very -stable at the same time.</para> - -<para>The order in which packages are installed in this chapter has -to be strictly followed, to ensure that no program gets a path referring -to <filename class="directory">/tools</filename> hard-wired into it. -For the same reason, <emphasis>do not </emphasis> compile packages -in parallel. Compiling in parallel may save you some time (especially on -dual-CPU machines), but it could result in a program containing a -hard-wired path to <filename class="directory">/tools</filename>, -which will cause the program to stop working when that directory -is removed.</para> - -<para>Before the installation instructions each installation page gives some -information about the package: a concise description of what it contains, how -long it will approximately take to build it, how much disk space it needs -during this building process, the official download location of the package -(in case you just want to update a few of them), and which other packages it -needs in order to be built successfully. After the installation instructions -follows a list of programs and libraries that the package installs, together -with a series of short descriptions of these.</para> - -<para>If you wish to keep track of which package installs what files, you may -want to use a package manager. For a general overview of package managers have -a look at <ulink url="&blfs-root;view/cvs/introduction/pkgmgt.html"/>. And for -a package management method specifically geared towards LFS see -<ulink url="&hints-root;more_control_and_pkg_man.txt"/>.</para> +<?dbhtml filename="chapter06.html"?> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="introduction.xml"/> -<sect1 id="ch-system-proc"> -<title>Mounting the proc and devpts file systems</title> -<?dbhtml filename="proc.html" dir="chapter06"?> -<para>In order for certain programs to function properly, the -<emphasis>proc</emphasis> and <emphasis>devpts</emphasis> file systems must be -available within the chroot environment. The proc file system is the process -information pseudo file system through which the kernel provides information -about the status of the system. And the devpts file system is nowadays the most -common way pseudo terminals (PTYs) are implemented. Since kernel version 2.4, a -file system can be mounted as many times and in as many places as you like, -thus it's not a problem that these file systems are already mounted on your -host system, especially so because they are virtual file systems.</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="proc.xml"/> -<para>First become <emphasis>root</emphasis>, as only <emphasis>root</emphasis> -can mount file systems in unusual places. Then check again that the LFS -environment variable is set correctly by running <userinput>echo -$LFS</userinput> and making sure it shows the path to your LFS partition's -mount point, which is <filename class="directory">/mnt/lfs</filename> if you -followed our example.</para> -<para>Now make the mount points for these filesystems:</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="chroot.xml"/> -<screen><userinput>mkdir -p $LFS/{proc,dev/pts}</userinput></screen> -<para>Mount the <emphasis>proc</emphasis> file system with:</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="changingowner.xml"/> -<screen><userinput>mount proc $LFS/proc -t proc</userinput></screen> -<para>And mount the <emphasis>devpts</emphasis> file system with:</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="creatingdirs.xml"/> -<screen><userinput>mount devpts $LFS/dev/pts -t devpts</userinput></screen> -<para>This last command might fail with an error like:</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="createfiles.xml"/> -<blockquote><screen>filesystem devpts not supported by kernel</screen></blockquote> -<para>The most likely cause for this is that your host system's kernel was -compiled without support for the devpts file system (you can check which file -systems your kernel supports with <command>cat /proc/filesystems</command>, -for example). A few PTYs are needed to be able to run the suites for Binutils -and GCC later on. If your kernel does not support devpts, do not worry, there -is another way to get them working inside the chroot environment. We'll cover -this shortly in the <xref linkend="ch-system-MAKEDEV"/> section.</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="pwdgroup.xml"/> -<para>Remember that if for any reason you stop working on your LFS, and start -again later, it's important to check that these file systems are mounted again -before entering the chroot environment, otherwise problems could occur.</para> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="makedev.xml"/> -<sect1 id="ch-system-chroot"> -<title>Entering the chroot environment</title> -<?dbhtml filename="chroot.html" dir="chapter06"?> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="kernel-headers.xml"/> -<para>It is time to enter the chroot environment in order to begin building -and installing your final LFS system. Still as <emphasis>root</emphasis> run -the following command to enter the small world that is, at the moment, -populated with only the temporary tools:</para> -<screen><userinput>chroot $LFS /tools/bin/env -i \ - HOME=/root TERM=$TERM PS1='\u:\w\$ ' \ - PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \ - /tools/bin/bash +h</userinput></screen> - -<para>The <emphasis>-i</emphasis> option passed to the <command>env</command> -command will clear all variables of the chroot environment. After that, only -the HOME, TERM, PS1 and PATH variables are set again. The HOME variable is set -mainly to prevent several small warnings during the configure runs of -Diffutils, Grep and Grub. The TERM variable is set to make programs such as -<command>less</command> and <command>vim</command>, that make use of the -Ncurses package, operate properly -- the TERM=$TERM construct sets the TERM -variable inside chroot to the same value as outside chroot. The main prompt -(PS1) is set to "username:working-dir# " (since the "\$" becomes "#" for root). -If you need other variables present, such as CFLAGS, CXXFLAGS or LDFLAGS, this -is a good place to set them.</para> - -<para>From this point on there's no need to use the LFS variable anymore, -because everything you do will be restricted to the LFS file system -- since -what the shell thinks is <filename class="directory">/</filename> is actually -the value of <filename class="directory">$LFS</filename>, which was passed to -the chroot command.</para> - -<para>Notice that <filename class="directory">/tools/bin</filename> comes -last in the PATH. This means that a temporary tool will not be used any more -as soon as its final version is installed. Well, at least when the shell -doesn't remember the locations of executed binaries -- for this reason hashing -is switched off by passing the <emphasis>+h</emphasis> option to -<command>bash</command>.</para> - -<para>You have to make sure all the commands in the rest of this chapter and -in the following chapters are run from within the chroot environment. -If you ever leave this environment for any reason (rebooting for example), -you must remember to first mount the proc and devpts file systems (discussed -in the previous section) <emphasis>and</emphasis> enter chroot again before -continuing with the installations.</para> - -<para>Note that the bash prompt will say "I have no name!" This is normal, as -the <filename>/etc/passwd</filename> file has not been created yet.</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="man-pages.xml"/> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="glibc.xml"/> -<sect1 id="ch-system-changingowner"> -<title>Changing ownership</title> -<?dbhtml filename="changingowner.html" dir="chapter06"?> - -<para>Right now the <filename class="directory">/tools</filename> directory -is owned by the user <emphasis>lfs</emphasis>, a user that exists only on your -host system. Although you will probably want to delete the -<filename class="directory">/tools</filename> directory once you have -finished your LFS system, you may want to keep it around, for example to -build more LFS systems. But if you keep the -<filename class="directory">/tools</filename> directory as it is, you end up -with files owned by a user ID without a corresponding account. This is -dangerous because a user account created later on could get this same user ID -and would suddenly own the <filename class="directory">/tools</filename> -directory and all the files therein, thus exposing these files to possible -malicious manipulation.</para> - -<para>To avoid this issue, you could add the <emphasis>lfs</emphasis> user to -your new LFS system later on when creating the <filename>/etc/passwd</filename> -file, taking care to assign it the same user and group IDs as on your host -system. Alternatively, you can (and the book assumes you do) assign the -contents of the <filename class="directory">/tools</filename> directory to -user <emphasis>root</emphasis> by running the following command:</para> - -<screen><userinput>chown -R 0:0 /tools</userinput></screen> - -<para>The command uses "0:0" instead of "root:root", because -<userinput>chown</userinput> is unable to resolve the name "root" until the -password file has been created.</para> -</sect1> -<sect1 id="ch-system-creatingdirs"> -<title>Creating directories</title> -<?dbhtml filename="creatingdirs.html" dir="chapter06"?> - -<para>Let's now create some structure in our LFS file system. Let's create -a directory tree. Issuing the following commands will create a more or less -standard tree:</para> - -<screen><userinput>mkdir -p /{bin,boot,dev/{pts,shm},etc/opt,home,lib,mnt,proc} -mkdir -p /{root,sbin,tmp,usr/local,var,opt} -mkdir /usr/{bin,include,lib,sbin,share,src} -ln -s share/{man,doc,info} /usr -mkdir /usr/share/{doc,info,locale,man} -mkdir /usr/share/{misc,terminfo,zoneinfo} -mkdir /usr/share/man/man{1,2,3,4,5,6,7,8} -mkdir /usr/local/{bin,etc,include,lib,sbin,share,src} -ln -s share/{man,doc,info} /usr/local -mkdir /usr/local/share/{doc,info,locale,man} -mkdir /usr/local/share/{misc,terminfo,zoneinfo} -mkdir /usr/local/share/man/man{1,2,3,4,5,6,7,8} -mkdir /var/{lock,log,mail,run,spool} -mkdir -p /var/{tmp,opt,cache,lib/misc,local} -mkdir /opt/{bin,doc,include,info} -mkdir -p /opt/{lib,man/man{1,2,3,4,5,6,7,8}}</userinput></screen> - -<para>Directories are, by default, created with permission mode 755, but this -isn't desirable for all directories. We will make two changes: one to the home -directory of <emphasis>root</emphasis>, and another to the directories for -temporary files.</para> - -<screen><userinput>chmod 0750 /root -chmod 1777 /tmp /var/tmp</userinput></screen> - -<para>The first mode change ensures that not just anybody can enter the -<filename class="directory">/root</filename> directory -- the same -as a normal user would do with his or her home directory. -The second mode change makes sure that any user can write to the -<filename class="directory">/tmp</filename> and -<filename class="directory">/var/tmp</filename> directories, but -cannot remove other users' files from them. The latter is prohibited -by the so-called "sticky bit" -- the highest bit in the 1777 bit mask.</para> - -<sect2> -<title>FHS compliance note</title> - -<para>We have based our directory tree on the FHS standard (available at -<ulink url="http://www.pathname.com/fhs/"/>). Besides the above created -tree this standard stipulates the existence of -<filename class="directory">/usr/local/games</filename> and -<filename class="directory">/usr/share/games</filename>, but we don't -much like these for a base system. However, feel free to make your system -FHS-compliant. As to the structure of the -<filename class="directory">/usr/local/share</filename> subdirectory, the FHS -isn't precise, so we created here the directories that we think are needed.</para> - -</sect2> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="readjusting.xml"/> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="binutils.xml"/> -<sect1 id="ch-system-createfiles"> -<title>Creating essential symlinks</title> -<?dbhtml filename="createfiles.html" dir="chapter06"?> -<para>Some programs hard-wire paths to programs which don't exist yet. In -order to satisfy these programs, we create a number of symbolic links which -will be replaced by real files throughout the course of this chapter when -we're installing all the software.</para> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gcc.xml"/> -<screen><userinput>ln -s /tools/bin/{bash,cat,pwd,stty} /bin -ln -s /tools/bin/perl /usr/bin -ln -s /tools/lib/libgcc_s.so.1 /usr/lib -ln -s bash /bin/sh</userinput></screen> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="coreutils.xml"/> -<sect1 id="ch-system-pwdgroup"> -<title>Creating the passwd, group and log files</title> -<?dbhtml filename="pwdgroup.html" dir="chapter06"?> - -<para>In order for <emphasis>root</emphasis> to be able to login and for the -name "root" to be recognized, there need to be relevant entries in the -<filename>/etc/passwd</filename> and <filename>/etc/group</filename> files.</para> - -<para>Create the <filename>/etc/passwd</filename> file by running the following -command:</para> - -<screen><userinput>cat > /etc/passwd << "EOF"</userinput> -root:x:0:0:root:/root:/bin/bash -<userinput>EOF</userinput></screen> - -<para>The actual password for <emphasis>root</emphasis> (the "x" here is just a -placeholder) will be set later.</para> - -<para>Create the <filename>/etc/group</filename> file by running the following -command:</para> - -<screen><userinput>cat > /etc/group << "EOF"</userinput> -root:x:0: -bin:x:1: -sys:x:2: -kmem:x:3: -tty:x:4: -tape:x:5: -daemon:x:6: -floppy:x:7: -disk:x:8: -lp:x:9: -dialout:x:10: -audio:x:11: -<userinput>EOF</userinput></screen> - -<para>The created groups aren't part of any standard -- they are some of the -groups that the <command>make_devices</command> script in the next section -uses. The LSB (<ulink url="http://www.linuxbase.org/">Linux Standard -Base</ulink>) recommends only that, beside the group "root" with a GID of 0, a -group "bin" with a GID of 1 be present. All other group names and GIDs can -be chosen freely by the system administrator, since well-written packages don't -depend on GID numbers but use the group's name.</para> - -<para>To get rid of the "I have no name!" prompt, we will start a new shell. -Since we installed a full Glibc in <xref linkend="chapter-temporary-tools"/>, -and have just created the <filename>/etc/passwd</filename> and -<filename>/etc/group</filename> files, user name and group name resolution -will now work.</para> - -<screen><userinput>exec /tools/bin/bash +h</userinput></screen> - -<para>Note the use of the <emphasis>+h</emphasis> directive. This tells -<command>bash</command> not to use its internal path hashing. Without this -directive, <command>bash</command> would remember the paths to binaries it -has executed. Since we want to use our newly compiled binaries as soon as -they are installed, we turn off this function for the duration of this -chapter.</para> - -<para>The <command>login</command>, <command>agetty</command> and -<command>init</command> programs (and some others) use a number of log -files to record information such as who was logged into the system and when. -These programs, however, won't write to the log files if they don't already -exist. Initialize the log files and give them their proper permissions:</para> - -<screen><userinput>touch /var/run/utmp /var/log/{btmp,lastlog,wtmp} -chmod 644 /var/run/utmp /var/log/{btmp,lastlog,wtmp}</userinput></screen> - -<para>The <filename>/var/run/utmp</filename> file records the users that are -currently logged in. The <filename>/var/log/wtmp</filename> file records all -logins and logouts. The <filename>/var/log/lastlog</filename> file records for -each user when he or she last logged in. The <filename>/var/log/btmp</filename> -file records the bad login attempts.</para> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="zlib.xml"/> -&c6-makedev; -&c6-kernel-headers; -&c6-manpages; -&c6-glibc; - - -<sect1 id="ch-system-readjusting"> -<title>Re-adjusting the toolchain</title> -<?dbhtml filename="readjusting.html" dir="chapter06"?> - -<para>Now that the new and final C libraries have been installed, it's time to -adjust our toolchain again. We'll adjust it so that it will link any newly -compiled program against these new libraries. This is in fact the same thing we -did in the "Adjusting" phase in the beginning of the previous chapter, even -though it looks like the reverse: then we guided the chain from the host's -<filename class="directory">/{,usr/}lib</filename> to the new -<filename class="directory">/tools/lib</filename>, now we guide it from that -same <filename class="directory">/tools/lib</filename> -to the LFS's <filename class="directory">/{,usr/}lib</filename>.</para> - -<para>First we adjust the linker. For this we retained the -source and build directories from the second pass over Binutils. Install the -adjusted linker by running the following from within the -<filename class="directory">binutils-build</filename> directory:</para> - -<screen><userinput>make -C ld INSTALL=/tools/bin/install install</userinput></screen> - -<note><para>If you somehow missed the earlier warning to retain the Binutils -source and build directories from the second pass in -<xref linkend="chapter-temporary-tools"/>, or otherwise accidentally deleted them or just -don't have access to them, don't worry, all is not lost. Just ignore the above -command. The result will be that the next package, Binutils, will link against -the C libraries in <filename class="directory">/tools</filename> rather -than in <filename class="directory">/{,usr/}lib</filename>. This is not ideal, -however, our testing has shown that the resulting Binutils program binaries -should be identical.</para></note> - -<para>From now on every compiled program will link <emphasis>only</emphasis> -against the libraries in <filename>/usr/lib</filename> and -<filename>/lib</filename>. The extra -<emphasis>INSTALL=/tools/bin/install</emphasis> is needed because the Makefile -created during the second pass still contains the reference to -<filename>/usr/bin/install</filename>, which we obviously haven't installed yet. -Some host distributions contain a <filename class="symlink">ginstall</filename> -symbolic link which takes precedence in the Makefile and thus can cause a -problem here. The above command takes care of this also.</para> - -<para>You must now remove the Binutils source and build directories. (This is -important, as you should start the next section with a fresh untarring of the -package.)</para> - -<para>The next thing to do is to amend our GCC specs file so that it points -to the new dynamic linker. Just like earlier on, we use a sed to accomplish -this:</para> - -<!-- Ampersands are needed to allow cut and paste --> - -<screen><userinput>SPECFILE=/tools/lib/gcc-lib/*/*/specs && -sed -e 's@ /tools/lib/ld-linux.so.2@ /lib/ld-linux.so.2@g' \ - $SPECFILE > newspecfile && -mv -f newspecfile $SPECFILE && -unset SPECFILE</userinput></screen> - -<para>Again, cutting and pasting the above is recommended. And just like -before, it is a good idea to visually inspect the specs file to verify the -intended change was actually made.</para> - -<important><para>If you are working on a platform where the name of the dynamic -linker is something other than <filename>ld-linux.so.2</filename>, you -<emphasis>must</emphasis> substitute <filename>ld-linux.so.2</filename> with the -name of your platform's dynamic linker in the above commands. Refer back to -<xref linkend="tools-technicalnotes"/> if necessary.</para></important> - -<!-- HACK - Force some whitespace to appease tidy --> -<literallayout></literallayout> - -<caution><para>It is imperative at this point to stop and ensure that the -basic functions (compiling and linking) of the adjusted toolchain are working -as expected. For this we are going to perform a simple sanity check:</para> - -<screen><userinput>echo 'main(){}' > dummy.c -cc dummy.c -readelf -l a.out | grep ': /lib'</userinput></screen> - -<para>If everything is working correctly, there should be no errors, and the -output of the last command will be (allowing for platform specific differences -in dynamic linker name):</para> - -<blockquote><screen>[Requesting program interpreter: /lib/ld-linux.so.2]</screen></blockquote> - -<para>Note especially that <filename class="directory">/lib</filename> is now -the prefix of our dynamic linker.</para> - -<para> If you did not receive the output -as shown above, or received no output at all, then something is seriously wrong. -You will need to investigate and retrace your steps to find out where the -problem is and correct it. There is no point in continuing until this is done. -Most likely something went wrong with the specs file amendment above.</para> - -<para>Once you are satisfied that all is well, clean up the test files:</para> - -<screen><userinput>rm dummy.c a.out</userinput></screen> -</caution> - -<!-- HACK - Force some whitespace to appease tidy --> -<literallayout></literallayout> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="mktemp.xml"/> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="iana-etc.xml"/> -&c6-binutils; -&c6-gcc; - -&c6-coreutils; -&c6-zlib; -&c6-lfs-utils; -&c6-findutils; -&c6-gawk; -&c6-ncurses; -&c6-vim; -&c6-m4; -&c6-bison; -&c6-less; -&c6-groff; -&c6-sed; -&c6-flex; -&c6-gettext; -&c6-nettools; -&c6-inetutils; -&c6-perl; -&c6-texinfo; -&c6-autoconf; -&c6-automake; -&c6-bash; -&c6-file; -&c6-libtool; -&c6-bzip2; -&c6-diffutils; -&c6-ed; -&c6-kbd; -&c6-e2fsprogs; -&c6-grep; -&c6-grub; -&c6-gzip; -&c6-man; -&c6-make; -&c6-modutils; -&c6-patch; -&c6-procinfo; -&c6-procps; -&c6-psmisc; -&c6-shadow; -&c6-sysklogd; -&c6-sysvinit; -&c6-tar; -&c6-utillinux; -&c6-gcc-2953; - - -<sect1 id="ch-system-aboutdebug"> -<title>About debugging symbols</title> -<?dbhtml filename="aboutdebug.html" dir="chapter06"?> - -<para>Most programs and libraries are, by default, compiled with debugging -symbols included (with <command>gcc</command>'s <emphasis>-g</emphasis> -option). This means that, when debugging a program or library that was compiled -with debugging information included, the debugger can give you not only memory -addresses but also the names of the routines and variables.</para> - -<para>The inclusion of these debugging symbols, however, enlarges a program or -library significantly. To get an idea of the amount of space these symbols -occupy, have a look at the following:</para> - -<itemizedlist> - -<listitem><para>a bash binary -with debugging symbols: 1200 KB</para></listitem> - -<listitem><para>a bash binary -without debugging symbols: 480 KB</para></listitem> - -<listitem><para>Glibc and GCC files (/lib and /usr/lib) -with debugging symbols: 87 MB</para></listitem> - -<listitem><para>Glibc and GCC files -without debugging symbols: 16 MB</para></listitem> - -</itemizedlist> - -<para>Sizes may vary somewhat, depending on which compiler was used and which C -library, but when comparing programs with and without debugging symbols the -difference will generally be a factor between 2 and 5.</para> - -<para>As most people will probably never use a debugger on their system -software, a lot of disk space can be regained by removing these symbols. For -your convenience, the next section shows how to strip all debugging symbols -from all programs and libraries. Information on other ways of optimizing your -system can be found in the hint at <ulink -url="&hints-root;optimization.txt"/>.</para> -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="findutils.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gawk.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="ncurses.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="vim.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="m4.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="bison.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="less.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="groff.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="sed.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="flex.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gettext.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="net-tools.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="inetutils.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="perl.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="texinfo.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="autoconf.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="automake.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="bash.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="file.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="libtool.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="bzip2.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="diffutils.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="ed.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="kbd.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="e2fsprogs.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="grep.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="grub.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gzip.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="man.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="make.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="modutils.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="patch.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="procinfo.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="procps.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="psmisc.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="shadow.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="sysklogd.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="sysvinit.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="tar.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="util-linux.xml"/> + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="gcc-2953.xml"/> + + + + +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="aboutdebug.xml"/> <sect1 id="ch-system-strippingagain"> <title>Stripping again</title> -<?dbhtml filename="strippingagain.html" dir="chapter06"?> +<?dbhtml filename="strippingagain.html"?> <para>If you are not a programmer and don't plan to do any debugging on your system software, you can shrink your system by about 200 MB by removing the @@ -585,14 +218,14 @@ If you're not sure whether you entered chroot with the command given in <para>Then reenter it with:</para> <screen><userinput>chroot $LFS /tools/bin/env -i \ - HOME=/root TERM=$TERM PS1='\u:\w\$ ' \ - PATH=/bin:/usr/bin:/sbin:/usr/sbin \ - /tools/bin/bash</userinput></screen> + HOME=/root TERM=$TERM PS1='\u:\w\$ ' \ + PATH=/bin:/usr/bin:/sbin:/usr/sbin \ + /tools/bin/bash --login</userinput></screen> <para>Now you can safely strip the binaries and libraries:</para> <screen><userinput>/tools/bin/find /{,usr/}{bin,lib,sbin} -type f \ - -exec /tools/bin/strip --strip-debug '{}' ';'</userinput></screen> + -exec /tools/bin/strip --strip-debug '{}' ';'</userinput></screen> <para>A large number of files will be reported as having their file format not recognized. These warnings can be safely ignored, they just mean that those @@ -607,42 +240,6 @@ destroyed.</para> </sect1> -<sect1 id="ch-system-revisedchroot"> -<title>Cleaning up</title> -<?dbhtml filename="revisedchroot.html" dir="chapter06"?> - -<para>From now on, when you exit the chroot environment and wish to reenter -it, you should use the following modified chroot command:</para> - -<screen><userinput>chroot $LFS /usr/bin/env -i \ - HOME=/root TERM=$TERM PS1='\u:\w\$ ' \ - PATH=/bin:/usr/bin:/sbin:/usr/sbin \ - /bin/bash</userinput></screen> - -<para>The reason for this is that, since the programs in <filename -class="directory">/tools</filename> are no longer needed, you may want to -delete the whole directory and regain the space. Before actually deleting the -directory, exit from chroot and reenter it with the above command. Also, before -removing <filename class="directory">/tools</filename>, you may want to tar it -up and store it in a safe place, in case you want to build another LFS system -soon.</para> - -<note><para>Removing <filename class="directory">/tools</filename> will also -remove the temporary copies of Tcl, Expect and DejaGnu, which were used for -running the toolchain tests. If you want to use these programs later on, you -will need to recompile and re-install them. The installation instructions are -the same as in <xref linkend="chapter-temporary-tools"/>, apart from changing -the prefix from <emphasis>/tools</emphasis> to <emphasis>/usr</emphasis>. The -BLFS book discusses a slightly different approach to installing Tcl, see <ulink -url="&blfs-root;"/>.</para></note> - -<para>You may also want to move the packages and patches stored in <filename -class="directory">/sources</filename> to a more usual location, such as -<filename class="directory">/usr/src/packages</filename>, and remove the -directory -- or simply delete the whole directory if you've burned its contents -on a CD).</para> - -</sect1> +<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="revisedchroot.xml"/> </chapter> - |