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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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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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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60 | <para os="e">To keep track of which package installs particular files, a package |
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61 | manager can be used. For a general overview of different styles of package |
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62 | managers, please refer to <ulink |
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63 | url="&blfs-root;view/svn/introduction/important.html"/>. |
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64 | For a package management method specifically geared towards LFS, we |
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65 | recommend <ulink url="&hints-root;more_control_and_pkg_man.txt"/>.</para> |
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66 | |
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67 | <!-- <note os="f"> |
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68 | <para>The remainder of this book is to be performed while logged |
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69 | in as user <systemitem class="username">root</systemitem> and no longer |
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70 | as user <systemitem class="username">lfs</systemitem>.</para> |
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71 | </note> --> |
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72 | |
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73 | </sect1> |
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