[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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| 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[3be4d97] | 6 | <sect1 id="ch-scatter-how">
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[6370fa6] | 7 | <title>How things are going to be done</title>
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[673b0d8] | 8 | <?dbhtml filename="how.html"?>
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[6370fa6] | 9 |
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[35c2fa60] | 10 | <para>You are going to build your LFS system by using a previously installed
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| 11 | Linux distribution (such as Debian, Mandrake, Red Hat, or SuSE). This existing
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| 12 | Linux system (the host) will be used as a starting point, because you will need
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| 13 | programs like a compiler, linker and shell to build the new system. Normally
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| 14 | all the required tools are available if you selected <quote>development</quote>
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| 15 | as one of the options when you installed your distribution.</para>
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[6370fa6] | 16 |
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[673b0d8] | 17 | <para>In <xref linkend="chapter-partitioning"/> you will first create a new Linux native
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[7f1fcd8] | 18 | partition and file system, the place where your new LFS system will be compiled
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[673b0d8] | 19 | and installed. Then in <xref linkend="chapter-getting-materials"/> you download all the
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| 20 | packages and patches needed to build an LFS system, and store them on the new
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| 21 | file system. In <xref linkend="chapter-final-preps"/> you set up a good
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[c6b5ddb] | 22 | environment to work in.</para>
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[c61dd1e] | 23 |
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[673b0d8] | 24 | <para><xref linkend="chapter-temporary-tools"/> then discusses the installation of a number
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| 25 | of packages that will form the basic development suite (or <emphasis>toolchain</emphasis>) which is
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| 26 | used to build the actual system in <xref linkend="chapter-building-system"/>. Some of these
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| 27 | packages are needed to resolve circular dependencies -- for example, to compile
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| 28 | a compiler you need a compiler.</para>
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[60ed866] | 29 |
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[673b0d8] | 30 | <para>The first thing to be done in <xref linkend="chapter-temporary-tools"/> is build a
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| 31 | first pass of the toolchain, made up of Binutils and GCC. The programs from
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| 32 | these packages will be linked statically in order for them to be usable
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| 33 | independently of the host system. The second thing to do is build Glibc, the
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| 34 | C library. Glibc will be compiled by the toolchain programs just built in
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| 35 | the first pass. The third thing to do is build a second pass of the toolchain.
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| 36 | This time the toolchain will be dynamically linked against the newly built
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| 37 | Glibc. The remaining <xref linkend="chapter-temporary-tools"/> packages are all built using
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| 38 | this second pass toolchain and dynamically linked against the new
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| 39 | host-independent Glibc. When this is done, the LFS installation process will no
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| 40 | longer depend on the host distribution, with the exception of the running
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| 41 | kernel.</para>
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[c61dd1e] | 42 |
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[7f1fcd8] | 43 | <para>You may be thinking that <quote>this seems like a lot of work, just to
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| 44 | get away from my host distribution</quote>. Well, a full technical explanation
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[673b0d8] | 45 | is provided at the start of <xref linkend="chapter-temporary-tools"/>, including some notes
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| 46 | on the differences between statically and dynamically linked programs.</para>
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[cc7e27a] | 47 |
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[673b0d8] | 48 | <para>In <xref linkend="chapter-building-system"/> your real LFS system will be built. The
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[87188e32] | 49 | <command>chroot</command> (change root) program is used to enter a virtual environment and start
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[673b0d8] | 50 | a new shell whose root directory will be set to the LFS partition. This is very
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| 51 | similar to rebooting and instructing the kernel to mount the LFS partition as
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| 52 | the root partition. The reason that you don't actually reboot, but instead
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| 53 | chroot, is that creating a bootable system requires additional work which isn't
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| 54 | necessary just yet. But the major advantage is that <quote>chrooting</quote> allows you to
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| 55 | continue using the host while LFS is being built. While waiting for package
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| 56 | compilation to complete, you can simply switch to a different VC (Virtual
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| 57 | Console) or X desktop and continue using the computer as you normally
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| 58 | would.</para>
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[32489b5] | 59 |
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[7f1fcd8] | 60 | <para>To finish the installation, the bootscripts are set up in
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[dcff046] | 61 | <xref linkend="chapter-bootscripts"/>, the kernel and bootloader are set up in
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[673b0d8] | 62 | <xref linkend="chapter-bootable"/>, and <xref linkend="chapter-finalizing"/> contains some
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| 63 | pointers to help you after you finish the book. Then, finally, you're ready to
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| 64 | reboot your computer into your new LFS system.</para>
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[32489b5] | 65 |
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[673b0d8] | 66 | <para>This is the process in a nutshell. Detailed information on the steps you
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| 67 | will take are discussed in the chapters and package descriptions as you
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| 68 | progress through them. If something isn't completely clear now, don't worry,
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| 69 | everything will fall into place soon.</para>
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| 70 |
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| 71 | <para>Please read <xref linkend="chapter-final-preps"/> carefully as it explains
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| 72 | a few important things you should be aware of before you begin to work through
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| 73 | <xref linkend="chapter-temporary-tools"/> and beyond.</para>
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[6370fa6] | 74 |
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| 75 | </sect1>
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