1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/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-cross-tools-variables">
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9 | <?dbhtml filename="variables.html"?>
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10 |
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11 | <title>Build Variables</title>
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12 |
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13 | <bridgehead renderas="sect4">Setting Host and Target</bridgehead>
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14 |
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15 | <para os="a">During the building of the cross-compile tools you will need to
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16 | set a few variables that will be dependent on your particular needs.
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17 | The first variable will be the triplet of the host machine, which will be
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18 | put into the <envar>CLFS_HOST</envar> variable. To account for the
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19 | possibility that the host and target are the same arch, as cross-compiling
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20 | won't work when host and target are the same, part of the triplet needs to
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21 | be changed slightly to add "cross". Set <envar>CLFS_HOST</envar> using the
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22 | following command:</para>
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23 |
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24 | <screen role="nodump" os="b"><userinput>export CLFS_HOST=$(echo ${MACHTYPE} | sed -e 's/-[^-]*/-cross/')</userinput></screen>
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25 |
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26 | <para os="c">Now you will need to set the triplet for the target
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27 | architecture. Set the target variable using the following command:</para>
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28 |
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29 | <screen role="nodump" os="d"><userinput>export CLFS_TARGET="[target triplet]"</userinput></screen>
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30 |
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31 | <para os="t1">Replace [target triplet] with the appropriate machine triplet
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32 | using the table at the bottom of the page.</para>
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33 |
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34 | <bridgehead renderas="sect4">Copy settings to the Environment</bridgehead>
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35 |
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36 | <para os="e">Now add these to <filename>~/.bashrc</filename>, just in
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37 | case you have to exit and restart building later:</para>
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38 |
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39 | <screen os="f"><userinput>cat >> ~/.bashrc << EOF
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40 | export CLFS_HOST="${CLFS_HOST}"
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41 | export CLFS_TARGET="${CLFS_TARGET}"
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42 | EOF</userinput></screen>
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43 |
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44 | <table os="g">
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45 | <title>Processor Type and Target Triplets</title>
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46 | <?dbfo table-width="5in" ?>
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47 |
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48 | <tgroup cols="2">
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49 |
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50 | <colspec colnum="1" colwidth="2.5in" colname="Processor"/>
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51 | <colspec colnum="2" colwidth="2.5in" colname="Triplet"/>
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52 |
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53 | <thead>
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54 | <row>
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55 | <entry>Processor</entry>
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56 | <entry>Target Triplet</entry>
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57 | </row>
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58 | </thead>
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59 |
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60 | <tbody>
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61 | <row>
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62 | <entry>386 Compatibles</entry>
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63 | <entry>Not Supported By Glibc</entry>
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64 | </row>
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65 | <row>
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66 | <entry>486 Compatibles</entry>
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67 | <entry>i486-pc-linux-gnu</entry>
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68 | </row>
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69 | <row>
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70 | <entry>Pentium, K6, 586 Compatibles</entry>
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71 | <entry>i586-pc-linux-gnu</entry>
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72 | </row>
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73 | <row>
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74 | <entry>Pentium II, Pentium III, Pentium 4</entry>
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75 | <entry>i686-pc-linux-gnu</entry>
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76 | </row>
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77 | <row>
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78 | <entry>Athlon, Duron</entry>
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79 | <entry>i686-pc-linux-gnu</entry>
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80 | </row>
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81 | </tbody>
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82 |
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83 | </tgroup>
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84 |
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85 | </table>
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86 |
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87 | </sect1>
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