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ml-11.0 multilib
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Update to new lfs structure

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-introduction">
9 <?dbhtml filename="introduction.html"?>
10
11 <title>Introduction</title>
12
13 <para>In this chapter, we start constructing the LFS system in earnest.
14 </para>
15
16 <para>The installation of this software is straightforward. Although in many
17 cases the installation instructions could be made shorter and more generic,
18 we have opted to provide the full instructions for every package to minimize
19 the possibilities for mistakes. The key to learning what makes a Linux system
20 work is to know what each package is used for and why you (or the system)
21 may need it.</para>
22
23 <para>We do not recommend using optimizations. They can make
24 a program run slightly faster, but they may also cause compilation
25 difficulties and problems when running the program. If a package refuses to
26 compile when using optimization, try to compile it without optimization and
27 see if that fixes the problem. Even if the package does compile when using
28 optimization, there is the risk it may have been compiled incorrectly because
29 of the complex interactions between the code and build tools. Also note that
30 the <option>-march</option> and <option>-mtune</option> options using values
31 not specified in the book have not been tested. This may cause problems with
32 the toolchain packages (Binutils, GCC and Glibc). The small potential gains
33 achieved in using compiler optimizations are often outweighed by the risks.
34 First-time builders of LFS are encouraged to build without custom
35 optimizations. The subsequent system will still run very fast and be stable
36 at the same time.</para>
37
38 <para>Before the installation instructions, each installation page provides
39 information about the package, including a concise description of what it
40 contains, approximately how long it will take to build, and how much disk
41 space is required during this building process. Following the installation
42 instructions, there is a list of programs and libraries (along with brief
43 descriptions) that the package installs.</para>
44
45 <note><para>The SBU values and required disk space includes test suite data
46 for all applicable packages in <xref linkend="chapter-building-system"/>. SBU
47 values have been calculated using a single CPU core (-j1) for all
48 operations.</para></note>
49
50 <sect2>
51 <title>About libraries</title>
52
53 <para>In general, the LFS editors discourage building and installing static
54 libraries. The original purpose for most static libraries has been made
55 obsolete in a modern Linux system. In addition, linking a static library
56 into a program can be detrimental. If an update to the library is needed
57 to remove a security problem, all programs that use the static library will
58 need to be relinked to the new library. Since the use of static libraries
59 is not always obvious, the relevant programs (and the procedures needed to
60 do the linking) may not even be known.</para>
61
62 <para>In the procedures in this chapter, we remove or disable installation of
63 most static libraries. Usually this is done by passing a
64 <option>--disable-static</option> option to <command>configure</command>.
65 In other cases, alternate means are needed. In a few cases, especially
66 glibc and gcc, the use of static libraries remains essential to the general
67 package building process. </para>
68
69 <para>For a more complete discussion of libraries, see the discussion
70 <ulink url="&blfs-root;/view/&short-version;/introduction/libraries.html">
71 Libraries: Static or shared?</ulink> in the BLFS book.</para>
72
73 </sect2>
74
75</sect1>
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