| 1 | <chapter id="chapter05">
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| 2 | <title>Preparing the LFS system</title>
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| 3 | <?dbhtml filename="chapter05.html" dir="chapter05"?>
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| 4 |
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| 5 | &c5-introduction;
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| 6 | &c5-whystatic;
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| 7 | &c5-creatingstage1dir;
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| 8 | &c5-addinguser;
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| 9 | &c5-settingenviron;
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| 10 | &c5-binutils-pass1;
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| 11 | &c5-gcc-pass1;
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| 12 | &c5-kernelheaders;
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| 13 | &c5-glibc;
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| 14 | &c5-lockingglibc;
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| 15 | &c5-tcl;
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| 16 | &c5-expect;
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| 17 | &c5-dejagnu;
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| 18 | &c5-gcc-pass2;
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| 19 | &c5-binutils-pass2;
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| 20 | &c5-gawk;
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| 21 | &c5-coreutils;
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| 22 | &c5-bzip2;
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| 23 | &c5-gzip;
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| 24 | &c5-diffutils;
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| 25 | &c5-findutils;
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| 26 | &c5-make;
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| 27 | &c5-grep;
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| 28 | &c5-sed;
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| 29 | &c5-gettext;
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| 30 | &c5-ncurses;
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| 31 | &c5-patch;
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| 32 | &c5-tar;
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| 33 | &c5-texinfo;
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| 34 | &c5-bash;
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| 35 | &c5-utillinux;
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| 36 | &c5-perl;
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| 37 |
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| 38 |
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| 39 | <sect1 id="ch05-adjustingtoolchain">
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| 40 | <title>Re-adjusting the toolchain</title>
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| 41 | <?dbhtml filename="adjustingtoolchain.html" dir="chapter05"?>
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| 42 |
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| 43 | <para>Now that we have compiled all the necessary tools, it is time to
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| 44 | re-adjust our toolchain. We will set it up so that it will link any newly
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| 45 | compiled program against the new Glibc, which is the first thing to get
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| 46 | compiled in the next chapter. Basically, this is the reverse of what we did
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| 47 | in the "Locking in" stage in the beginning of this chapter.</para>
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| 48 |
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| 49 | <para>The first thing to do is to adjust the linker scripts. For this we
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| 50 | retained the <filename>binutils-build</filename> directory from the second
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| 51 | pass over Binutils. Do the following:</para>
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| 52 |
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| 53 | <para><screen><userinput>cd binutils-build
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| 54 | make -C ld INSTALL=/stage1/bin/install install-data-local</userinput></screen></para>
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| 55 |
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| 56 | <para>This installs the adjusted linker scripts. The linker scripts now contain
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| 57 | no mention of <filename>/stage1/lib</filename>. From now on every compiled
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| 58 | program will link <emphasis>only</emphasis> against the libraries in
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| 59 | <filename>/usr/lib</filename> and <filename>/lib</filename>. The extra
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| 60 | <userinput>INSTALL=/stage1/bin/install</userinput> is needed because the
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| 61 | Makefile created during the second pass still contains the reference to
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| 62 | <filename>/usr/bin/install</filename>, which we obviously haven't installed
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| 63 | yet.</para>
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| 64 |
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| 65 | <para>You can now remove the Binutils source and build directories.</para>
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| 66 |
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| 67 | <para>The next thing to do is to amend our GCC specs file so that it points to
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| 68 | the new dynamic linker. Just like earlier on, we use a sed to accomplish
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| 69 | this:</para>
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| 70 |
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| 71 | <para><screen><userinput>CURRENTSPECFILE=/stage1/lib/gcc-lib/*/*/specs
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| 72 | sed -e 's@/stage1/lib/ld.so.1@/lib/ld.so.1@g' \
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| 73 | -e 's@/stage1/lib/ld-linux.so.2@/lib/ld-linux.so.2@g' \
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| 74 | $CURRENTSPECFILE > newspecfile
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| 75 | mv newspecfile $CURRENTSPECFILE
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| 76 | unset CURRENTSPECFILE</userinput></screen></para>
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| 77 |
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| 78 | <para>Again, cutting and pasting the above is recommended. And just like
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| 79 | before, it is a good idea to check the linker scripts and the specs file to
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| 80 | ensure the intended changes were actually made.</para>
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| 81 |
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| 82 | <para>Note that the linker scripts will still contain a reference to
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| 83 | <filename>/stage1/i686-pc-linux-gnu/lib</filename>. This is unavoidable, but
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| 84 | luckily does not present a problem. There are no libraries in that location
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| 85 | as all the temporary stage1 libraries are located in
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| 86 | <filename>/stage1/lib</filename>.</para>
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| 87 |
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| 88 | </sect1>
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| 89 |
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| 90 |
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| 91 |
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| 92 | <sect1 id="ch05-stripping">
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| 93 | <title>Stripping</title>
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| 94 | <?dbhtml filename="stripping.html" dir="chapter05"?>
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| 95 |
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| 96 | <para>If your LFS partition is rather small, you will be glad to learn that you
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| 97 | can throw away some unnecessary things. The executables and libraries you have
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| 98 | built so far contain about 130 MB of unneeded debugging symbols. Remove those
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| 99 | symbols like this:</para>
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| 100 |
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| 101 | <para><screen><userinput>strip --strip-unneeded /stage1/{,s}bin/*
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| 102 | strip --strip-debug /stage1/lib/*</userinput></screen></para>
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| 103 |
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| 104 | <para>The first of the above commands will skip some twenty files, reporting
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| 105 | that it doesn't recognize their file format. Most of them are scripts instead
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| 106 | of binaries.</para>
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| 107 |
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| 108 | <para>Take care <emphasis>not</emphasis> to use
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| 109 | <userinput>--strip-unneeded</userinput> on the libraries -- they would be
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| 110 | destroyed and you would have to build Glibc all over again.</para>
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| 111 |
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| 112 | <para>To save another couple of megabytes, you can throw away the documentation
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| 113 | and some of the bigger unneeded programs:</para>
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| 114 |
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| 115 | <para><screen><userinput>rm -r /stage1/share/{doc,info,man}
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| 116 | rm /stage1/bin/{addr2line,gprof,nm,size,strings,strip}</userinput></screen></para>
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| 117 |
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| 118 | <para>You will now need to have at least 700 MB of free space on your LFS
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| 119 | filesystem to be able to build and install Glibc in the next phase.</para>
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| 120 |
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| 121 | </sect1>
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| 122 |
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| 123 | </chapter>
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| 124 |
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