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-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">Configuration # 1 - Creating different |
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14 | architecture tools</bridgehead> |
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15 | |
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16 | <para os="a">This method is recommended for all LiveCD based distro's.</para> |
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17 | |
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18 | <para os="b">During the building of the cross-compile tools you will need to |
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19 | set a few variables that will be dependent on your particular needs. |
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20 | The first variable will be the triplet of the <envar>HOST</envar> machine. |
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21 | You will need to set the <envar>CHOST</envar> triplet to match your |
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22 | particular needs. To set this information you can issue the following |
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23 | command:</para> |
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24 | |
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25 | <screen os="c"><userinput>export LFS_HOST="${MACHTYPE}"</userinput></screen> |
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26 | |
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27 | <para os="d">Now you will need to set the target triplet for the target |
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28 | architecture. You can do this by running the same command as above, just |
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29 | running it on the target machine. If you can't run the command on the |
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30 | target machine, you can use the table at the bottom of this page. Set |
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31 | the command using the method listed below:</para> |
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32 | |
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33 | <screen os="e"><userinput>export LFS_TARGET="{target triplet}"</userinput></screen> |
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34 | |
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35 | <bridgehead renderas="sect4">Configuration # 2 - Creating same |
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36 | architecture tools</bridgehead> |
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37 | |
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38 | <para os="f">You can also create <quote>clean</quote> tools on your current |
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39 | distro. This will ensure that you have all the prerequisites for the |
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40 | LFS build.</para> |
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41 | |
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42 | <para os="g">You will need to set your host target triplet a little differently. |
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43 | To set this information you can issue the following commands:</para> |
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44 | |
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45 | <screen os="h"><userinput>export LFS_HOST="`echo ${MACHTYPE} | sed -e 's/unknown/cross/g' -e 's/-pc-/-cross-/g'`"</userinput></screen> |
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46 | |
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47 | <para os="i">Now you will need to set the target triplet for the target, which |
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48 | in this case is very simple. Set the command using the method listed |
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49 | below:</para> |
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50 | |
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51 | <screen os="j"><userinput>export LFS_TARGET="${MACHTYPE}"</userinput></screen> |
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52 | |
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53 | <bridgehead renderas="sect4">Sanity Check</bridgehead> |
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54 | |
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55 | <para os="k">Let's perform a sanity check to prevent build issues. If our LFS_HOST matches our |
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56 | target, we will get some failures during our cross-compile:</para> |
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57 | |
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58 | <screen os="l"><userinput>if [ "${LFS_HOST}" = "${LFS_TARGET}" ]; then \ |
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59 | echo "Host and Target can't be the same." ; fi</userinput></screen> |
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60 | |
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61 | <para os="m">If you received an message, "Host and Target can't be the same." |
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62 | You will need to use the other Configuration Method. This will prevent build |
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63 | issues during the early phases of the build.</para> |
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64 | |
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65 | <bridgehead renderas="sect4">Copy settings to Environment</bridgehead> |
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66 | |
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67 | <para os="n">Now we will add these to <filename>~/.bashrc</filename>, just in |
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68 | case you have to exit and restart building later:</para> |
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69 | |
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70 | <screen os="o"><userinput>echo export LFS_HOST=\""${LFS_HOST}\"" >> ~/.bashrc |
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71 | echo export LFS_TARGET=\""${LFS_TARGET}\"" >> ~/.bashrc</userinput></screen> |
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72 | |
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73 | <table os="p"> |
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74 | <title>List of architectures, target triplets, and recommended book</title> |
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75 | <tgroup cols="2" align="center"> |
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76 | <colspec colname="Processor"/> |
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77 | <colspec colname="Triplet"/> |
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78 | <colspec colname="Book"/> |
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79 | <thead> |
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80 | <row> |
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81 | <entry>Architecture</entry> |
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82 | <entry>Target Triplet</entry> |
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83 | <entry>32 Bit, 64 Bit, 32/64 Bit</entry> |
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84 | </row> |
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85 | </thead> |
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86 | <tbody> |
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87 | <row> |
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88 | <entry>Pentium, K6, 586 Compatibles</entry> |
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89 | <entry>i586-pc-linux-gnu</entry> |
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90 | <entry>32 Bit</entry> |
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91 | </row> |
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92 | <row> |
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93 | <entry>Pentium II, Pentium III, Pentium 4</entry> |
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94 | <entry>i686-pc-linux-gnu</entry> |
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95 | <entry>32 Bit</entry> |
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96 | </row> |
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97 | <row> |
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98 | <entry>Athlon, Duron</entry> |
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99 | <entry>i686-pc-linux-gnu</entry> |
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100 | <entry>32 Bit</entry> |
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101 | </row> |
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102 | <row> |
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103 | <entry>Athlon64</entry> |
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104 | <entry>x86_64-pc-linux-gnu</entry> |
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105 | <entry>32/64 Bit</entry> |
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106 | </row> |
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107 | <row> |
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108 | <entry>PowerPC</entry> |
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109 | <entry>powerpc-unknown-linux-gnu</entry> |
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110 | <entry>32 Bit</entry> |
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111 | </row> |
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112 | <row> |
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113 | <entry>PowerPC64</entry> |
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114 | <entry>ppc64-unknown-linux-gnu</entry> |
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115 | <entry>64 Bit</entry> |
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116 | </row> |
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117 | <row> |
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118 | <entry>MIPS</entry> |
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119 | <entry>mips-unknown-linux-gnu</entry> |
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120 | <entry>32 Bit</entry> |
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121 | </row> |
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122 | <row> |
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123 | <entry>MIPS Little Endian</entry> |
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124 | <entry>mipsel-unknown-linux-gnu</entry> |
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125 | <entry>32 Bit</entry> |
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126 | </row> |
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127 | <row> |
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128 | <entry>MIPS 64</entry> |
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129 | <entry>mips64-unknown-linux-gnu</entry> |
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130 | <entry>64 Bit</entry> |
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131 | </row> |
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132 | <row> |
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133 | <entry>MIPS 64 Little Endian</entry> |
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134 | <entry>mips64el-unknown-linux-gnu</entry> |
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135 | <entry>64 Bit</entry> |
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136 | </row> |
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137 | <row> |
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138 | <entry>Cypress</entry> |
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139 | <entry>sparc-unknown-linux-gnu</entry> |
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140 | <entry>32 Bit</entry> |
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141 | </row> |
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142 | <row> |
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143 | <entry>Supersparc and Hypersparc</entry> |
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144 | <entry>sparc-unknown-linux-gnu</entry> |
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145 | <entry>32 Bit</entry> |
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146 | </row> |
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147 | <row> |
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148 | <entry>Ultrasparc</entry> |
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149 | <entry>sparc64-unknown-linux-gnu</entry> |
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150 | <entry>32/64 Bit</entry> |
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151 | </row> |
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152 | <row> |
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153 | <entry>Alpha</entry> |
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154 | <entry>alpha-unknown-linux-gnu</entry> |
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155 | <entry>64 Bit</entry> |
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156 | </row> |
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157 | </tbody> |
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158 | </tgroup> |
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159 | </table> |
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160 | |
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161 | </sect1> |
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