[3f8be484] | 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 os="a">In this chapter, we enter the building site and start |
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| 14 | constructing the LFS system in earnest. The installation of this |
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| 15 | software is straightforward. Although in many cases the installation |
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| 16 | instructions could be made shorter and more generic, we have opted |
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| 17 | to provide the full instructions for every package to minimize the |
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| 18 | possibilities for mistakes. The key to learning what makes a Linux |
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| 19 | system work is to know what each package is used for and why the user |
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| 20 | (or the system) needs it. For every installed package, a summary of |
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| 21 | its contents is given, followed by concise descriptions of each |
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| 22 | program and library the package installed.</para> |
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| 23 | |
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| 24 | <para os="b">If using the compiler optimizations provided in this chapter, |
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| 25 | please review the optimization hint at <ulink |
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| 26 | url="&hints-root;optimization.txt"/>. Compiler optimizations can make |
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| 27 | a program run slightly faster, but they may also cause compilation |
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| 28 | difficulties and problems when running the program. If a package |
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| 29 | refuses to compile when using optimization, try to compile it without |
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| 30 | optimization and see if that fixes the problem. Even if the package |
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| 31 | does compile when using optimization, there is the risk it may have |
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| 32 | been compiled incorrectly because of the complex interactions between |
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[82f7fed] | 33 | the code and build tools. Also note that the <option>-march</option> |
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| 34 | and <option>-mtune</option> options may cause problems with the toolchain |
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| 35 | packages (Binutils, GCC and Glibc). The small potential gains achieved in |
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| 36 | using compiler optimizations are often outweighed by the risks. First-time |
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[3f8be484] | 37 | builders of LFS are encouraged to build without custom optimizations. |
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| 38 | The subsequent system will still run very fast and be stable at the |
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| 39 | same time.</para> |
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| 40 | |
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| 41 | <para os="c">The order that packages are installed in this chapter needs to |
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| 42 | be strictly followed to ensure that no program accidentally acquires a |
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| 43 | path referring to <filename class="directory">/tools</filename> |
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| 44 | hard-wired into it. For the same reason, do not compile packages in |
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| 45 | parallel. Compiling in parallel may save time (especially on dual-CPU |
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| 46 | machines), but it could result in a program containing a hard-wired |
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| 47 | path to <filename class="directory">/tools</filename>, which will |
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| 48 | cause the program to stop working when that directory is |
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| 49 | removed.</para> |
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| 50 | |
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| 51 | <para os="d">Before the installation instructions, each installation page |
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| 52 | provides information about the package, including a concise |
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| 53 | description of what it contains, approximately how long it will take |
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| 54 | to build, how much disk space is required during this building |
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| 55 | process, and any other packages needed to successfully build the |
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| 56 | package. Following the installation instructions, there is a list of |
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| 57 | programs and libraries (along with brief descriptions of these) that |
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| 58 | the package installs.</para> |
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| 59 | |
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[1322a63] | 60 | <para os="e">To keep track of which package installs particular files, a |
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| 61 | package manager can be used. For a general overview of different styles of |
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| 62 | package managers, please take a look at the next page.</para> |
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[3f8be484] | 63 | |
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| 64 | </sect1> |
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