| 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-tools-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>This chapter shows how to compile and install a minimal Linux system.
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| 14 | This system will contain just enough tools to start constructing the final
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| 15 | LFS system in <xref linkend="chapter-building-system"/> and allow a working
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| 16 | environment with more user convenience than a minimum environment would.</para>
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| 17 |
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| 18 | <para>There are two steps in building this minimal system. The first step
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| 19 | is to build a new and host-independent toolchain (compiler, assembler,
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| 20 | linker, libraries, and a few useful utilities). The second step uses this
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| 21 | toolchain to build the other essential tools.</para>
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| 22 |
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| 23 | <para>The files compiled in this chapter will be installed under the
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| 24 | <filename class="directory">$LFS/tools</filename> directory to keep them
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| 25 | separate from the files installed in the next chapter and the host
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| 26 | production directories. Since the packages compiled here are temporary,
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| 27 | we do not want them to pollute the soon-to-be LFS system.</para>
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| 28 |
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| 29 | <important>
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| 30 | <para>Before issuing the build instructions for a package, the package
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| 31 | should be unpacked as user <systemitem class="username">lfs</systemitem>,
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| 32 | and a <command>cd</command> into the created directory should be performed.
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| 33 | The build instructions assume that the <command>bash</command> shell is
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| 34 | in use.</para>
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| 35 | </important>
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| 36 |
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| 37 | <para>Several of the packages are patched before compilation, but only when
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| 38 | the patch is needed to circumvent a problem. A patch is often needed in both
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| 39 | this and the next chapter, but sometimes in only one or the other. Therefore,
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| 40 | do not be concerned if instructions for a downloaded patch seem to be missing.
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| 41 | Warning messages about <emphasis>offset</emphasis> or <emphasis>fuzz</emphasis>
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| 42 | may also be encountered when applying a patch. Do not worry about these
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| 43 | warnings, as the patch was still successfully applied.</para>
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| 44 |
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| 45 | <para>During the compilation of most packages, there will be several warnings
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| 46 | that scroll by on the screen. These are normal and can safely be ignored.
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| 47 | These warnings are as they appear—warnings about deprecated, but not
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| 48 | invalid, use of the C or C++ syntax. C standards change fairly often, and
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| 49 | some packages still use the older standard. This is not a problem, but does
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| 50 | prompt the warning.</para>
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| 51 |
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| 52 | <important>
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| 53 | <para>After installing each package, delete its source and build directories,
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| 54 | unless specifically instructed otherwise. Deleting the sources prevents
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| 55 | mis-configuration when the same package is reinstalled later.</para>
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| 56 | </important>
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| 57 |
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| 58 | <para>Check one last time that the <envar>LFS</envar> environment
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| 59 | variable is set up properly:</para>
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| 60 |
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| 61 | <screen role="nodump"><userinput>echo $LFS</userinput></screen>
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| 62 |
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| 63 | <para>Make sure the output shows the path to the LFS partition's mount
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| 64 | point, which is <filename class="directory">/mnt/lfs</filename>, using
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| 65 | our example.</para>
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| 66 |
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| 67 | </sect1>
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