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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