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/2001/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, MPFR and MPC 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. Unpack each package into the GCC source directory and rename the
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49 | resulting directories so the GCC build procedures will automatically
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50 | use them:</para>
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51 |
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52 | <note><para>There are frequent misunderstandings about this chapter. The
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53 | procedures are the same as every other chapter as explained earlier (<xref
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54 | linkend='buildinstr'/>). First extract the gcc tarball from the sources
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55 | directory and then change to the directory created. Only then should you
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56 | proceed with the instructions below.</para></note>
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57 |
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58 | <screen><userinput remap="pre">tar -jxf ../mpfr-&mpfr-version;.tar.bz2
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59 | mv -v mpfr-&mpfr-version; mpfr
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60 | tar -Jxf ../gmp-&gmp-version;.tar.xz
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61 | mv -v gmp-&gmp-version; gmp
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62 | tar -zxf ../mpc-&mpc-version;.tar.gz
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63 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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64 |
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65 | <para>The following command will change the location of GCC's default
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66 | dynamic linker to use the one installed in <filename
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67 | class="directory">/tools</filename>. It also removes <filename
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68 | class="directory">/usr/include</filename> from GCC's include search path.
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69 | Issue:</para>
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70 |
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71 | <screen><userinput remap="pre">for file in \
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72 | $(find gcc/config -name linux64.h -o -name linux.h -o -name sysv4.h)
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73 | do
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74 | cp -uv $file{,.orig}
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75 | sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
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76 | -e 's@/usr@/tools@g' $file.orig > $file
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77 | echo '
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78 | #undef STANDARD_STARTFILE_PREFIX_1
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79 | #undef STANDARD_STARTFILE_PREFIX_2
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80 | #define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
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81 | #define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
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82 | touch $file.orig
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83 | done</userinput></screen>
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84 |
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85 | <para>In case the above seems hard to follow, let's break it down a bit.
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86 | First we find all the files under the <filename
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87 | class="directory">gcc/config</filename> directory that are named either
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88 | <filename>linux.h</filename>, <filename>linux64.h</filename> or
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89 | <filename>sysv4.h</filename>. For each file found, we copy it to a file of
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90 | the same name but with an added suffix of <quote>.orig</quote>. Then the
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91 | first sed expression prepends <quote>/tools</quote> to every instance of
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92 | <quote>/lib/ld</quote>, <quote>/lib64/ld</quote> or
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93 | <quote>/lib32/ld</quote>, while the second one replaces hard-coded
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94 | instances of <quote>/usr</quote>. Next, we add our define statements which
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95 | alter the default startfile prefix to the end of the file. Note that the
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96 | trailing <quote>/</quote> in <quote>/tools/lib/</quote> is required.
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97 | Finally, we use <command>touch</command> to update the timestamp on the
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98 | copied files. When used in conjunction with <command>cp -u</command>, this
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99 | prevents unexpected changes to the original files in case the commands are
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100 | inadvertently run twice. </para>
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101 |
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102 | <para>The GCC documentation recommends building GCC outside of the
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103 | source directory in a dedicated build directory:</para>
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104 |
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105 | <screen><userinput remap="pre">mkdir -v ../gcc-build
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106 | cd ../gcc-build</userinput></screen>
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107 |
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108 | <para>Prepare GCC for compilation:</para>
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109 |
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110 | <screen><userinput remap="configure">../gcc-&gcc-version;/configure \
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111 | --target=$LFS_TGT \
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112 | --prefix=/tools \
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113 | --with-sysroot=$LFS \
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114 | --with-newlib \
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115 | --without-headers \
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116 | --with-local-prefix=/tools \
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117 | --with-native-system-header-dir=/tools/include \
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118 | --disable-nls \
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119 | --disable-shared \
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120 | --disable-multilib \
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121 | --disable-decimal-float \
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122 | --disable-threads \
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123 | --disable-libmudflap \
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124 | --disable-libssp \
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125 | --disable-libgomp \
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126 | --disable-libquadmath \
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127 | --enable-languages=c \
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128 | --with-mpfr-include=$(pwd)/../gcc-&gcc-version;/mpfr/src \
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129 | --with-mpfr-lib=$(pwd)/mpfr/src/.libs</userinput></screen>
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130 |
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131 | <variablelist>
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132 | <title>The meaning of the configure options:</title>
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133 |
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134 | <varlistentry>
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135 | <term><parameter>--with-newlib</parameter></term>
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136 | <listitem>
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137 | <para>Since a working C library is not yet available, this ensures
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138 | that the inhibit_libc constant is defined when building libgcc. This prevents
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139 | the compiling of any code that requires libc support.</para>
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140 | </listitem>
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141 | </varlistentry>
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142 |
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143 | <varlistentry>
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144 | <term><parameter>--without-headers</parameter></term>
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145 | <listitem>
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146 | <para>When creating a complete cross-compiler, GCC requires
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147 | standard headers compatible with the target system. For our
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148 | purposes these headers will not be needed. This switch prevents
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149 | GCC from looking for them.</para>
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150 | </listitem>
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151 | </varlistentry>
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152 |
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153 | <varlistentry>
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154 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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155 | <listitem>
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156 | <para>The local prefix is the location in the system that GCC will search
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157 | for locally installed include files. The default is <filename>/usr/local</filename>.
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158 | Setting this to <filename>/tools</filename> helps keep the host location of
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159 | <filename>/usr/local</filename> out of this GCC's search path.</para>
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160 | </listitem>
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161 | </varlistentry>
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162 |
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163 | <varlistentry>
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164 | <term><parameter>--with-native-system-header-dir=/tools/include</parameter></term>
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165 | <listitem>
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166 | <para>By default GCC searches <filename>/usr/include</filename> for system
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167 | headers. In conjunction with the sysroot switch, this would translate normally
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168 | to <filename>$LFS/usr/include</filename>. However the headers that will be installed
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169 | in the next two sections will go to <filename>$LFS/tools/include</filename>. This
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170 | switch ensures that gcc will find them correctly. In the second pass of GCC, this
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171 | same switch will ensure that no headers from the host system are found.</para>
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172 | </listitem>
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173 | </varlistentry>
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174 |
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175 | <varlistentry>
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176 | <term><parameter>--disable-shared</parameter></term>
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177 | <listitem>
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178 | <para>This switch forces GCC to link its internal libraries
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179 | statically. We do this to avoid possible issues with the host
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180 | system.</para>
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181 | </listitem>
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182 | </varlistentry>
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183 |
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184 | <varlistentry>
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185 | <term><parameter>--disable-decimal-float, --disable-threads, --disable-libmudflap, --disable-libssp, --disable-libgomp, --disable-libquadmath</parameter></term>
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186 | <listitem>
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187 | <para>These switches disable support for the decimal floating point
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188 | extension, threading, libmudflap, libssp and libgomp and libquadmath
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189 | respectively. These features will fail to compile when building a
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190 | cross-compiler and are not necessary for the task of cross-compiling
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191 | the temporary libc.</para>
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192 | </listitem>
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193 | </varlistentry>
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194 |
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195 | <varlistentry>
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196 | <term><parameter>--disable-multilib</parameter></term>
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197 | <listitem>
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198 | <para>On x86_64, LFS does not yet support a multilib configuration.
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199 | This switch is harmless for x86.</para>
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200 | </listitem>
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201 | </varlistentry>
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202 |
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203 | <varlistentry>
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204 | <term><parameter>--enable-languages=c</parameter></term>
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205 | <listitem>
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206 | <para>This option ensures that only the C compiler is built.
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207 | This is the only language needed now.</para>
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208 | </listitem>
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209 | </varlistentry>
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210 |
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211 | </variablelist>
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212 |
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213 | <para>Compile GCC by running:</para>
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214 |
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215 | <screen><userinput remap="make">make</userinput></screen>
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216 |
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217 | <para>Compilation is now complete. At this point, the test suite would
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218 | normally be run, but, as mentioned before, the test suite framework is
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219 | not in place yet. The benefits of running the tests at this point
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220 | are minimal since the programs from this first pass will soon be
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221 | replaced.</para>
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222 |
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223 | <para>Install the package:</para>
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224 |
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225 | <screen><userinput remap="install">make install</userinput></screen>
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226 |
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227 | <para>Using <parameter>--disable-shared</parameter> means that the
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228 | <filename>libgcc_eh.a</filename> file isn't created and installed. The
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229 | Glibc package depends on this library as it uses
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230 | <parameter>-lgcc_eh</parameter> within its build system. This dependency
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231 | can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
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232 | since that file will end up containing the objects normally contained in
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233 | <filename>libgcc_eh.a</filename>:</para>
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234 |
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235 | <screen><userinput remap="install">ln -vs libgcc.a `$LFS_TGT-gcc -print-libgcc-file-name | sed 's/libgcc/&_eh/'`</userinput></screen>
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236 |
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237 | </sect2>
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238 |
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239 | <sect2 role="content">
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240 | <title/>
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241 |
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242 | <para>Details on this package are located in
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243 | <xref linkend="contents-gcc" role="."/></para>
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244 |
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245 | </sect2>
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246 |
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247 | </sect1>
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