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-pass2" role="wrap" xreflabel="gcc-pass2">
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9 | <?dbhtml filename="gcc-pass2.html"?>
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10 |
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11 | <sect1info condition="script">
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12 | <productname>gcc-pass2</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 2</title>
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18 |
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19 | <indexterm zone="ch-tools-gcc-pass2">
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20 | <primary sortas="a-GCC">GCC</primary>
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21 | <secondary>tools, pass 2</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/2001/XInclude"
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28 | href="../chapter08/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-tmpp2-sbu;</seg>
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37 | <seg>&gcc-tmpp2-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 GCC</title>
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45 |
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46 | <para>As in the first build of GCC, the GMP, MPFR, and MPC packages are
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47 | required. Unpack the tarballs and move them into the required directory
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48 | names:</para>
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49 |
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50 | <screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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51 | mv -v mpfr-&mpfr-version; mpfr
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52 | tar -xf ../gmp-&gmp-version;.tar.xz
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53 | mv -v gmp-&gmp-version; gmp
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54 | tar -xf ../mpc-&mpc-version;.tar.gz
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55 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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56 |
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57 | <para>If building on x86_64, change the default directory name for 64-bit
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58 | libraries to <quote>lib</quote>:</para>
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59 |
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60 | <screen><userinput remap="pre">case $(uname -m) in
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61 | x86_64)
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62 | sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
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63 | ;;
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64 | esac</userinput></screen>
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65 | <!--
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66 | <para>Fix an issue with GCC-10.1 when building with a cross
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67 | compiler:</para>
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68 |
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69 | <screen><userinput remap="pre">patch -Np1 -i ../&gcc-cross-patch;</userinput></screen>
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70 | -->
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71 | <para>Create a separate build directory again:</para>
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72 |
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73 | <screen><userinput remap="pre">mkdir -v build
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74 | cd build</userinput></screen>
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75 |
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76 | <para>Create a symlink that allows libgcc to be built with posix threads
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77 | support:</para>
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78 |
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79 | <screen><userinput remap="pre">mkdir -pv $LFS_TGT/libgcc
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80 | ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></screen>
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81 |
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82 | <para>Before starting to build GCC, remember to unset any environment
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83 | variables that override the default optimization flags.</para>
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84 |
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85 | <para>Now prepare GCC for compilation:</para>
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86 |
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87 | <screen><userinput remap="configure">../configure \
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88 | --build=$(../config.guess) \
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89 | --host=$LFS_TGT \
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90 | --prefix=/usr \
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91 | CC_FOR_TARGET=$LFS_TGT-gcc \
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92 | --with-build-sysroot=$LFS \
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93 | --enable-initfini-array \
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94 | --disable-nls \
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95 | --disable-multilib \
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96 | --disable-decimal-float \
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97 | --disable-libatomic \
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98 | --disable-libgomp \
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99 | --disable-libquadmath \
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100 | --disable-libssp \
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101 | --disable-libvtv \
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102 | --disable-libstdcxx \
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103 | --enable-languages=c,c++</userinput></screen>
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104 |
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105 | <variablelist>
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106 | <title>The meaning of the new configure options:</title><!-- WIP -->
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107 |
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108 | <varlistentry>
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109 | <term><parameter>-with-build-sysroot=$LFS</parameter></term>
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110 | <listitem>
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111 | <para>Normally, using <parameter>--host</parameter> ensures that
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112 | a cross-compiler is used for building GCC, and that compiler knows
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113 | that it has to look for headers and libraries in <filename
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114 | class="directory">$LFS</filename>. But the build system of GCC uses
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115 | other tools, which are not aware of this location. This switch is
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116 | needed to have them find the needed files in <filename
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117 | class="directory">$LFS</filename>, and not on the host.</para>
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118 | </listitem>
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119 | </varlistentry>
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120 |
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121 | <varlistentry>
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122 | <term><parameter>--enable-initfini-array</parameter></term>
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123 | <listitem>
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124 | <para>This option is automatically enabled when building a native
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125 | compiler with a native compiler on x86. But here, we build with
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126 | a cross compiler, so we need to explicitly set this option.</para>
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127 | </listitem>
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128 | </varlistentry>
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129 |
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130 | </variablelist>
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131 |
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132 | <para>Compile the package:</para>
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133 |
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134 | <screen><userinput remap="make">make</userinput></screen>
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135 |
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136 | <para>Install the package:</para>
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137 |
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138 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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139 |
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140 | <para>As a finishing touch, create a utility symlink. Many programs and scripts
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141 | run <command>cc</command> instead of <command>gcc</command>, which is
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142 | used to keep programs generic and therefore usable on all kinds of UNIX
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143 | systems where the GNU C compiler is not always installed. Running
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144 | <command>cc</command> leaves the system administrator free to decide
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145 | which C compiler to install:</para>
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146 |
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147 | <screen><userinput remap="install">ln -sv gcc $LFS/usr/bin/cc</userinput></screen>
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148 |
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149 | </sect2>
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150 |
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151 | <sect2 role="content">
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152 | <title/>
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153 |
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154 | <para>Details on this package are located in
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155 | <xref linkend="contents-gcc" role="."/></para>
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156 |
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157 | </sect2>
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158 |
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159 | </sect1>
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