mirror of https://github.com/tLDP/LDP
97 lines
5.2 KiB
XML
97 lines
5.2 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-intro-how">
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<?dbhtml filename="how.html"?>
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<title>How to Build an LFS System</title>
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<para>The LFS system will be built by using an already installed
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Linux distribution (such as Debian, OpenMandriva, Fedora, or openSUSE). This
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existing Linux system (the host) will be used as a starting point to
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provide necessary programs, including a compiler, linker, and shell,
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to build the new system. Select the <quote>development</quote> option
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during the distribution installation to be able to access these
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tools.</para>
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<para>As an alternative to installing a separate distribution onto your
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machine, you may wish to use <!-- the Linux From Scratch LiveCD or --> a LiveCD from a
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commercial distribution. <!-- The LFS LiveCD works well as a host system,
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providing all the tools you need to successfully follow the instructions in
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this book. The LiveCD version is behind the current book, but is still useful
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as a host for building the current book. The <quote>-nosrc</quote> or
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<quote>-min</quote> editions of the LiveCD are the most appropriate for
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building a current LFS system. For more information about the LFS LiveCD or
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to download a copy, visit <ulink url="&livecd-root;"/>. --></para>
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<!--
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<note>
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<para>The LFS LiveCD might not work on newer hardware configurations,
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failing to boot or failing to detect some devices such as some SATA hard
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drives.</para>
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</note> -->
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<para><xref linkend="chapter-partitioning"/> of this book describes how
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to create a new Linux native partition and file system. This is the place
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where the new LFS system will be compiled and installed. <xref
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linkend="chapter-getting-materials"/> explains which packages and
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patches need to be downloaded to build an LFS system and how to store
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them on the new file system. <xref linkend="chapter-final-preps"/>
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discusses the setup of an appropriate working environment. Please read
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<xref linkend="chapter-final-preps"/> carefully as it explains several
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important issues you need be aware of before beginning to
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work your way through <xref linkend="chapter-temporary-tools"/> and beyond.</para>
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<para><xref linkend="chapter-temporary-tools"/> explains the
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installation of a number of packages that will form the basic
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development suite (or toolchain) which is used to build the actual
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system in <xref linkend="chapter-building-system"/>. Some of these
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packages are needed to resolve circular dependencies—for example,
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to compile a compiler, you need a compiler.</para>
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<para><xref linkend="chapter-temporary-tools"/> also shows you how to
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build a first pass of the toolchain, including Binutils and GCC (first pass
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basically means these two core packages will be reinstalled).
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The next step is to build Glibc, the C library. Glibc will be compiled by
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the toolchain programs built in the first pass. Then, a second pass of the
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toolchain will be built. This time, the toolchain will be dynamically linked
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against the newly built Glibc. The remaining <xref
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linkend="chapter-temporary-tools"/> packages are built using this second
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pass toolchain. When this is done, the LFS installation process will no
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longer depend on the host distribution, with the exception of the running
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kernel. </para>
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<para>This effort to isolate the new system from the host distribution may
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seem excessive. A full technical explanation as to why this is done is provided in
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<xref linkend="ch-tools-toolchaintechnotes"/>.</para>
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<para>In <xref linkend="chapter-building-system"/>, the full LFS system is
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built. The <command>chroot</command> (change root) program is used to enter
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a virtual environment and start a new shell whose root directory will be
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set to the LFS partition. This is very similar to rebooting and instructing
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the kernel to mount the LFS partition as the root partition. The system
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does not actually reboot, but instead uses <command>chroot</command> because
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creating a bootable system requires additional work which is not necessary
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just yet. The major advantage is that <quote>chrooting</quote> allows you
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to continue using the host system while LFS is being built. While waiting
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for package compilations to complete, you can continue using your computer as
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normal.</para>
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<para>To finish the installation, the basic system configuration is set up in
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<xref linkend="chapter-bootscripts"/>, and the kernel and boot loader are set
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up in <xref linkend="chapter-bootable"/>. <xref linkend="chapter-finalizing"/>
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contains information on continuing the LFS experience beyond this book.
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After the steps in this book have been implemented, the computer will be
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ready to reboot into the new LFS system.</para>
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<para>This is the process in a nutshell. Detailed information on each
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step is discussed in the following chapters and package descriptions.
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Items that may seem complicated will be clarified, and everything will
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fall into place as you embark on the LFS adventure.</para>
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</sect1>
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