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-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 | <sect1info condition="script">
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12 | <productname>gcc</productname>
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13 | <productnumber>&gcc-version;</productnumber>
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14 | <address>&gcc-url;</address>
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15 | </sect1info>
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16 |
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17 | <title>GCC-&gcc-version; - Pass 1</title>
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18 |
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19 | <indexterm zone="ch-tools-gcc-pass1">
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20 | <primary sortas="a-GCC">GCC</primary>
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21 | <secondary>tools, pass 1</secondary>
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22 | </indexterm>
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23 |
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24 | <sect2 role="package">
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25 | <title/>
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26 |
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27 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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28 | href="../chapter06/gcc.xml"
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29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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30 |
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31 | <segmentedlist>
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32 | <segtitle>&buildtime;</segtitle>
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33 | <segtitle>&diskspace;</segtitle>
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34 |
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35 | <seglistitem>
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36 | <seg>&gcc-ch5p1-sbu;</seg>
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37 | <seg>&gcc-ch5p1-du;</seg>
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38 | </seglistitem>
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39 | </segmentedlist>
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40 |
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41 | </sect2>
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42 |
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43 | <sect2 role="installation">
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44 | <title>Installation of Cross GCC</title>
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45 |
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46 | <para>GCC now requires the GMP and MPFR packages. As these packages may
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47 | not be included in your host distribution, they will be built with
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48 | GCC:</para>
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49 |
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50 | <screen><userinput remap="pre">tar -jxf ../mpfr-&mpfr-version;.tar.bz2
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51 | mv -v mpfr-&mpfr-version; mpfr
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52 | tar -jxf ../gmp-&gmp-version;.tar.bz2
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53 | mv -v gmp-&gmp-version; gmp</userinput></screen>
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54 |
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55 | <para>The GCC documentation recommends building GCC outside of the
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56 | source directory in a dedicated build directory:</para>
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57 |
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58 | <screen><userinput remap="pre">mkdir -v ../gcc-build
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59 | cd ../gcc-build</userinput></screen>
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60 |
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61 | <para>Prepare GCC for compilation:</para>
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62 |
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63 | <screen><userinput remap="configure">../gcc-&gcc-version;/configure \
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64 | --target=$LFS_TGT --prefix=/tools \
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65 | --disable-nls --disable-shared --disable-multilib \
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66 | --disable-decimal-float --disable-threads \
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67 | --disable-libmudflap --disable-libssp \
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68 | --disable-libgomp --enable-languages=c</userinput></screen>
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69 |
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70 | <variablelist>
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71 | <title>The meaning of the configure options:</title>
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72 |
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73 | <varlistentry>
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74 | <term><parameter>--disable-shared</parameter></term>
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75 | <listitem>
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76 | <para>This switch forces GCC to link its internal libraries
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77 | statically. We do this to avoid possible issues with the host
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78 | system.</para>
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79 | </listitem>
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80 | </varlistentry>
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81 |
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82 | <varlistentry>
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83 | <term><parameter>--disable-decimal-float, --disable-threads, --disable-libmudflap, --disable-libssp, --disable-libgomp</parameter></term>
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84 | <listitem>
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85 | <para>These switches disable support for the decimal floating point extension,
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86 | threading, libmudflap, libssp and libgomp respectively. These features will fail
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87 | to compile when building a cross-compiler and are not necessary for the task of
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88 | cross-compiling the temporary libc.</para>
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89 | </listitem>
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90 | </varlistentry>
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91 |
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92 | <varlistentry>
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93 | <term><parameter>--disable-multilib</parameter></term>
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94 | <listitem>
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95 | <para>On x86_64, LFS does not yet support a multilib configuration.
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96 | This switch is harmless for x86.</para>
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97 | </listitem>
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98 | </varlistentry>
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99 |
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100 | <varlistentry>
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101 | <term><parameter>--enable-languages=c</parameter></term>
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102 | <listitem>
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103 | <para>This option ensures that only the C compiler is built.
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104 | This is the only language needed now.</para>
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105 | </listitem>
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106 | </varlistentry>
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107 |
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108 | </variablelist>
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109 |
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110 | <para>Compile GCC by running:</para>
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111 |
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112 | <screen><userinput remap="make">make</userinput></screen>
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113 |
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114 | <para>Compilation is now complete. At this point, the test suite would
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115 | normally be run, but, as mentioned before, the test suite framework is
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116 | not in place yet. The benefits of running the tests at this point
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117 | are minimal since the programs from this first pass will soon be
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118 | replaced.</para>
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119 |
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120 | <para>Install the package:</para>
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121 |
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122 | <screen><userinput remap="install">make install</userinput></screen>
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123 |
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124 | <para>Using <parameter>--disable-shared</parameter> means that the
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125 | <filename>libgcc_eh.a</filename> file isn't created and installed. The
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126 | Glibc package depends on this library as it uses
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127 | <parameter>-lgcc_eh</parameter> within its build system. This dependency
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128 | can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
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129 | since that file will end up containing the objects normally contained in
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130 | <filename>libgcc_eh.a</filename>:</para>
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131 |
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132 | <screen><userinput remap="install">ln -vs libgcc.a `$LFS_TGT-gcc -print-libgcc-file-name | \
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133 | sed 's/libgcc/&_eh/'`</userinput></screen>
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134 |
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135 | </sect2>
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136 |
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137 | <sect2 role="content">
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138 | <title/>
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139 |
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140 | <para>Details on this package are located in
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141 | <xref linkend="contents-gcc" role="."/></para>
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142 |
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143 | </sect2>
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144 |
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145 | </sect1>
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