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-gcc-pass1" role="wrap">
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9 | <?dbhtml filename="gcc-pass1.html"?>
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10 |
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11 | <title>GCC-&gcc-version; - Pass 1</title>
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12 |
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13 | <indexterm zone="ch-tools-gcc-pass1">
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14 | <primary sortas="a-GCC">GCC</primary>
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15 | <secondary>tools, pass 1</secondary>
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16 | </indexterm>
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17 |
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18 | <sect2 role="package">
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19 | <title/>
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20 |
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21 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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22 | href="../chapter06/gcc.xml"
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23 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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24 |
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25 | <segmentedlist>
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26 | <segtitle>&buildtime;</segtitle>
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27 | <segtitle>&diskspace;</segtitle>
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28 |
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29 | <seglistitem>
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30 | <seg>&gcc-ch5p1-sbu;</seg>
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31 | <seg>&gcc-ch5p1-du;</seg>
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32 | </seglistitem>
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33 | </segmentedlist>
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34 |
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35 | </sect2>
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36 |
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37 | <sect2 role="installation">
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38 | <title>Installation of GCC</title>
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39 |
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40 | <para>The GCC documentation recommends building GCC outside of the
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41 | source directory in a dedicated build directory:</para>
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42 |
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43 | <screen><userinput>mkdir -v ../gcc-build
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44 | cd ../gcc-build</userinput></screen>
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45 |
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46 | <para>Prepare GCC for compilation:</para>
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47 |
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48 | <screen><userinput>../gcc-&gcc-version;/configure --prefix=/tools \
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49 | --with-local-prefix=/tools --disable-nls --enable-shared \
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50 | --enable-languages=c</userinput></screen>
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51 |
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52 | <variablelist>
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53 | <title>The meaning of the configure options:</title>
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54 |
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55 | <varlistentry>
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56 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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57 | <listitem>
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58 | <para>The purpose of this switch is to remove <filename
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59 | class="directory">/usr/local/include</filename> from
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60 | <command>gcc</command>'s include search path. This is not
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61 | absolutely essential, however, it helps to minimize the
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62 | influence of the host system.</para>
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63 | </listitem>
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64 | </varlistentry>
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65 |
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66 | <varlistentry>
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67 | <term><parameter>--enable-shared</parameter></term>
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68 | <listitem>
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69 | <para>This switch allows the building of <filename
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70 | class="libraryfile">libgcc_s.so.1</filename> and
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71 | <filename class="libraryfile">libgcc_eh.a</filename>.
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72 | Having <filename class="libraryfile">libgcc_eh.a</filename>
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73 | available ensures that the configure script for Glibc (the
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74 | next package we compile) produces the proper results.</para>
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75 | </listitem>
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76 | </varlistentry>
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77 |
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78 | <varlistentry>
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79 | <term><parameter>--enable-languages=c</parameter></term>
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80 | <listitem>
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81 | <para>This option ensures that only the C compiler is built.</para>
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82 | </listitem>
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83 | </varlistentry>
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84 |
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85 | </variablelist>
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86 |
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87 | <para>Continue with compiling the package:</para>
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88 |
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89 | <screen><userinput>make bootstrap</userinput></screen>
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90 |
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91 | <variablelist>
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92 | <title>The meaning of the make parameter:</title>
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93 |
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94 | <varlistentry>
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95 | <term><parameter>bootstrap</parameter></term>
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96 | <listitem>
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97 | <para>This target does not just compile GCC, but compiles it
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98 | several times. It uses the programs compiled in a first round
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99 | to compile itself a second time, and then again a third time.
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100 | It then compares these second and third compiles to make sure
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101 | it can reproduce itself flawlessly. This also implies that it
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102 | was compiled correctly.</para>
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103 | </listitem>
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104 | </varlistentry>
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105 |
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106 | </variablelist>
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107 |
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108 | <para>Compilation is now complete. At this point, the test suite would
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109 | normally be run, but, as mentioned before, the test suite framework is
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110 | not in place yet. The benefits of running the tests at this point
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111 | are minimal since the programs from this first pass will soon be
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112 | replaced.</para>
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113 |
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114 | <para>Install the package:</para>
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115 |
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116 | <screen><userinput>make install</userinput></screen>
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117 |
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118 | <para>As a finishing touch, create a symlink. Many programs and scripts
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119 | run <command>cc</command> instead of <command>gcc</command>, which is
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120 | used to keep programs generic and therefore usable on all kinds of UNIX
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121 | systems where the GNU C compiler is not always installed. Running
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122 | <command>cc</command> leaves the system administrator free to decide
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123 | which C compiler to install.</para>
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124 |
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125 | <screen><userinput>ln -vs gcc /tools/bin/cc</userinput></screen>
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126 |
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127 | </sect2>
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128 |
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129 | <sect2 role="content">
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130 | <title/>
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131 |
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132 | <para>Details on this package are located in
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133 | <xref linkend="contents-gcc" role="."/></para>
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134 |
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135 | </sect2>
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136 |
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137 | </sect1>
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