| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-introduction">
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| 9 | <?dbhtml filename="introduction.html"?>
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| 10 |
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| 11 | <title>Introduction</title>
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| 12 |
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| 13 | <para>In this chapter, we enter the building site and start constructing the
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| 14 | LFS system in earnest. That is, we chroot into the temporary mini Linux system,
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| 15 | make a few final preparations, and then begin installing the packages.</para>
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| 16 |
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| 17 | <para>The installation of this software is straightforward. Although in many
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| 18 | cases the installation instructions could be made shorter and more generic,
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| 19 | we have opted to provide the full instructions for every package to minimize
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| 20 | the possibilities for mistakes. The key to learning what makes a Linux system
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| 21 | work is to know what each package is used for and why the user (or the system)
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| 22 | needs it. For every installed package, a summary of its contents is given,
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| 23 | followed by concise descriptions of each program and library the package
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| 24 | installed.</para>
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| 25 |
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| 26 | <para>If using the compiler optimizations provided in this chapter, please
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| 27 | review the optimization hint at <ulink url="&hints-root;optimization.txt"/>.
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| 28 | Compiler optimizations can make a program run slightly faster, but they may
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| 29 | also cause compilation difficulties and problems when running the program.
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| 30 | If a package refuses to compile when using optimization, try to compile it
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| 31 | without optimization and see if that fixes the problem. Even if the package
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| 32 | does compile when using optimization, there is the risk it may have been
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| 33 | compiled incorrectly because of the complex interactions between the code
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| 34 | and build tools. Also note that the <option>-march</option> and
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| 35 | <option>-mtune</option> options may cause problems with the toolchain packages
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| 36 | (Binutils, GCC and Glibc). The small potential gains achieved in using
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| 37 | compiler optimizations are often outweighed by the risks. First-time builders
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| 38 | of LFS are encouraged to build without custom optimizations. The subsequent
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| 39 | system will still run very fast and be stable at the same time.</para>
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| 40 |
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| 41 | <para>The order that packages are installed in this chapter needs to be
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| 42 | strictly followed to ensure that no program accidentally acquires a path
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| 43 | referring to <filename class="directory">/tools</filename> hard-wired into
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| 44 | it. For the same reason, do not compile packages in parallel. Compiling in
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| 45 | parallel may save time (especially on dual-CPU machines), but it could result
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| 46 | in a program containing a hard-wired path to <filename
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| 47 | class="directory">/tools</filename>, which will cause the program to stop
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| 48 | working when that directory is removed.</para>
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| 49 |
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| 50 | <para>Before the installation instructions, each installation page provides
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| 51 | information about the package, including a concise description of what it
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| 52 | contains, approximately how long it will take to build, how much disk space
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| 53 | is required during this building process, and any other packages needed to
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| 54 | successfully build the package. Following the installation instructions,
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| 55 | there is a list of programs and libraries (along with brief descriptions of
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| 56 | these) that the package installs.</para>
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| 57 |
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| 58 | </sect1>
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