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-glibc" role="wrap">
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9 | <?dbhtml filename="glibc.html"?>
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10 |
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11 | <sect1info condition="script">
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12 | <productname>glibc</productname>
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13 | <productnumber>&glibc-version;</productnumber>
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14 | <address>&glibc-url;</address>
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15 | </sect1info>
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16 |
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17 | <title>Glibc-&glibc-version;</title>
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18 |
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19 | <indexterm zone="ch-tools-glibc">
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20 | <primary sortas="a-Glibc">Glibc</primary>
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21 | <secondary>tools</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/glibc.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>&glibc-tmp-sbu;</seg>
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37 | <seg>&glibc-tmp-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 Glibc</title>
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45 |
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46 | <para arch="default">First, create a symbolic link for LSB compliance. Additionally,
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47 | for x86_64, create a compatibility symbolic link required for proper
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48 | operation of the dynamic library loader:</para>
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49 |
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50 | <screen arch="default"><userinput remap="pre">case $(uname -m) in
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51 | i?86) ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3
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52 | ;;
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53 | x86_64) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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54 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3
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55 | ;;
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56 | esac</userinput></screen>
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57 |
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58 | <para arch="ml_32,ml_x32,ml_all">First, create symbolic links for LSB compliance
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59 | and compatibility symbolic links required for proper
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60 | operation of the dynamic library loader:</para>
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61 |
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62 | <!-- no ld-linux.so.2 here as multilib is based on x86_64, not on i686 -->
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63 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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64 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3</userinput></screen>
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65 |
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66 | <para>Some of the Glibc programs use the non-FHS compliant
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67 | <filename class="directory">/var/db</filename> directory to store their
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68 | runtime data. Apply the following patch to make such programs store their
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69 | runtime data in the FHS-compliant locations:</para>
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70 |
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71 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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72 |
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73 | <para>The Glibc documentation recommends building Glibc
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74 | in a dedicated build directory:</para>
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75 |
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76 | <screen><userinput remap="pre">mkdir -v build
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77 | cd build</userinput></screen>
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78 |
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79 | <para>Next, prepare Glibc for compilation:</para>
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80 |
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81 | <screen arch="default"><userinput remap="configure">../configure \
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82 | --prefix=/usr \
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83 | --host=$LFS_TGT \
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84 | --build=$(../scripts/config.guess) \
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85 | --enable-kernel=&min-kernel; \
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86 | --with-headers=$LFS/usr/include \
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87 | libc_cv_slibdir=/lib</userinput></screen>
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88 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="configure">../configure \
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89 | --prefix=/usr \
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90 | --host=$LFS_TGT \
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91 | --build=$(../scripts/config.guess) \
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92 | --enable-kernel=&min-kernel; \
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93 | --with-headers=$LFS/usr/include \
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94 | --enable-multi-arch \
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95 | --libdir=/usr/lib \
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96 | --libexecdir=/usr/lib \
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97 | libc_cv_slibdir=/lib</userinput></screen>
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98 | <!--
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99 | libc_cv_forced_unwind=yes \
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100 | libc_cv_c_cleanup=yes</userinput></screen> -->
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101 |
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102 | <variablelist>
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103 | <title>The meaning of the configure options:</title>
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104 |
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105 | <varlistentry>
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106 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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107 | <listitem>
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108 | <para>The combined effect of these switches is that Glibc's build system
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109 | configures itself to be cross-compiled, using the cross-linker and
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110 | cross-compiler in <filename class="directory">$LFS/tools</filename>.</para>
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111 | </listitem>
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112 | </varlistentry>
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113 |
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114 | <varlistentry>
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115 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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116 | <listitem>
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117 | <para>This tells Glibc to compile the library with support
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118 | for &min-kernel; and later Linux kernels. Workarounds for older
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119 | kernels are not enabled.</para>
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120 | </listitem>
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121 | </varlistentry>
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122 |
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123 | <varlistentry>
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124 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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125 | <listitem>
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126 | <para>This tells Glibc to compile itself against the headers
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127 | recently installed to the $LFS/usr/include directory, so that
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128 | it knows exactly what features the kernel has and can optimize
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129 | itself accordingly.</para>
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130 | </listitem>
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131 | </varlistentry>
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132 |
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133 | <varlistentry>
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134 | <term><parameter>libc_cv_slibdir=/lib</parameter></term>
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135 | <listitem>
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136 | <para>This ensures that the library is installed in /lib instead
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137 | of the default /lib64 on 64 bit machines.</para>
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138 | </listitem>
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139 | </varlistentry>
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140 |
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141 | </variablelist>
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142 |
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143 | <para>During this stage the following warning might appear:</para>
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144 |
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145 | <blockquote>
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146 | <screen><computeroutput>configure: WARNING:
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147 | *** These auxiliary programs are missing or
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148 | *** incompatible versions: msgfmt
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149 | *** some features will be disabled.
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150 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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151 | </blockquote>
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152 |
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153 | <para>The missing or incompatible <command>msgfmt</command> program is
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154 | generally harmless. This <command>msgfmt</command> program is part of the
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155 | Gettext package which the host distribution should provide.</para>
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156 |
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157 | <note><para>There have been reports that this package may fail when
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158 | building as a "parallel make". If this occurs, rerun the make command
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159 | with a "-j1" option.</para></note>
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160 |
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161 | <para>Compile the package:</para>
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162 |
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163 | <screen><userinput remap="make">make</userinput></screen>
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164 |
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165 | <para>Install the package:</para>
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166 |
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167 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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168 | recommendations, you are building as
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169 | <systemitem class="username">root</systemitem>, the next command will
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170 | install the newly built glibc to your host system, which most likely
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171 | will render it unusable. So double check that the environment is
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172 | correctly set, before running the following command.</para></warning>
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173 |
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174 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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175 |
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176 | <variablelist>
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177 | <title>The meaning of the <command>make install</command> option:</title>
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178 |
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179 | <varlistentry>
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180 | <term><parameter>DESTDIR=$LFS</parameter></term>
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181 | <listitem>
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182 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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183 | packages to define the location where the package should be
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184 | installed. If it is not set, it defaults to the root (<filename
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185 | class="directory">/</filename>) directory. Here we specify that
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186 | the package be installed in <filename class="directory">$LFS
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187 | </filename>, which will become the root after <xref linkend=
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188 | "ch-tools-chroot"/>.</para>
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189 | </listitem>
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190 | </varlistentry>
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191 |
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192 | </variablelist>
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193 |
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194 | <caution>
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195 | <para>At this point, it is imperative to stop and ensure that the basic
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196 | functions (compiling and linking) of the new toolchain are working as
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197 | expected. To perform a sanity check, run the following commands:</para>
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198 |
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199 | <screen><userinput>echo 'int main(){}' > dummy.c
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200 | $LFS_TGT-gcc dummy.c
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201 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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202 |
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203 | <para>If everything is working correctly, there should be no errors,
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204 | and the output of the last command will be of the form:</para>
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205 |
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206 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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207 |
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208 | <para arch="default">Note that for 32-bit machines, the interpreter name will be
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209 | <filename>/lib/ld-linux.so.2</filename>.</para>
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210 |
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211 | <para>If the output is not shown as above or there was no output at all,
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212 | then something is wrong. Investigate and retrace the steps to find out
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213 | where the problem is and correct it. This issue must be resolved before
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214 | continuing on.</para>
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215 |
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216 | <para>Once all is well, clean up the test files:</para>
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217 |
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218 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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219 |
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220 | </caution>
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221 |
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222 | <note><para>Building packages in the next chapter will serve as an
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223 | additional check that the toolchain has been built properly. If some
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224 | package, especially binutils-pass2 or gcc-pass2, fails to build, it is
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225 | an indication that something has gone wrong with the
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226 | previous Binutils, GCC, or Glibc installations.</para></note>
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227 |
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228 | <para>Now that our cross-toolchain is complete, finalize the installation
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229 | of the limits.h header. For doing so, run a utility provided by the GCC
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230 | developers:</para>
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231 |
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232 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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233 |
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234 | </sect2>
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235 |
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236 | <!-- - - - - - - - - - -->
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237 | <!-- Multilib - 32bit -->
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238 | <!-- - - - - - - - - - -->
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239 | <sect2 arch="ml_32,ml_all">
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240 | <title>Building Glibc - 32bit</title>
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241 |
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242 | <para>Now recompile for m32. The extracted source can be
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243 | reused but needs to cleaned before installing the m32
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244 | version of Glibc.</para>
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245 |
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246 | <para>Clear the build directory and remove artefacts from
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247 | previous build:</para>
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248 |
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249 | <screen><userinput remap="pre">make clean
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250 | find .. -name "*.a" -delete</userinput></screen>
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251 |
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252 | <para>Configure Glibc for m32 with the following commands:</para>
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253 |
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254 | <screen><userinput remap="configure">CC="$LFS_TGT-gcc -m32" \
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255 | CXX="$LFS_TGT-g++ -m32" \
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256 | ../configure \
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257 | --prefix=/usr \
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258 | --host=$LFS_TGT32 \
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259 | --build=$(../scripts/config.guess) \
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260 | --enable-kernel=&min-kernel; \
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261 | --with-headers=$LFS/usr/include \
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262 | --enable-multi-arch \
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263 | --libdir=&usr-lib-m32; \
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264 | --libexecdir=&usr-lib-m32; \
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265 | libc_cv_slibdir=&lib-m32;</userinput></screen>
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266 |
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267 | <para>Compile the package:</para>
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268 |
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269 | <screen><userinput remap="make">make</userinput></screen>
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270 |
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271 | <para>Install the package:</para>
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272 |
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273 | <screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
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274 | cp -a DESTDIR&lib-m32;/* $LFS&lib-m32;/
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275 | cp -a DESTDIR&usr-lib-m32; $LFS/usr/
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276 | install -vm644 DESTDIR/usr/include/gnu/{lib-names,stubs}-32.h \
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277 | $LFS/usr/include/gnu/
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278 | ln -svf ..&lib-m32;/ld-linux.so.2 $LFS/lib/ld-linux.so.2</userinput></screen>
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279 |
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280 | <caution>
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281 | <para>At this point, it is imperative to stop and ensure that the basic
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282 | functions (compiling and linking) of the new toolchain are working as
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283 | expected. To perform a sanity check, run the following commands:</para>
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284 |
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285 | <screen><userinput>echo 'int main(){}' > dummy.c
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286 | $LFS_TGT-gcc -m32 dummy.c
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287 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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288 |
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289 | <para>If everything is working correctly, there should be no errors,
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290 | and the output of the last command will be of the form:</para>
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291 |
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292 | <screen><computeroutput>[Requesting program interpreter: /lib/ld-linux.so.2]</computeroutput></screen>
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293 |
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294 | <para>If the output is not shown as above or there was no output at all,
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295 | then something is wrong. Investigate and retrace the steps to find out
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296 | where the problem is and correct it. This issue must be resolved before
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297 | continuing on.</para>
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298 |
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299 | <para>Once all is well, clean up the test files:</para>
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300 |
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301 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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302 |
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303 | </caution>
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304 |
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305 | </sect2><!-- m32 -->
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306 |
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307 | <!-- - - - - - - - - - -->
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308 | <!-- Multilib - x32bit -->
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309 | <!-- - - - - - - - - - -->
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310 |
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311 | <sect2 arch="ml_x32,ml_all">
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312 | <title>Building Glibc - x32bit</title>
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313 |
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314 | <para>Now recompile for mx32. The extracted source can be
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315 | reused but needs to cleaned before installing the mx32
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316 | version of Glibc.</para>
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317 |
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318 | <para>Clear the build directory and remove artefacts from
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319 | previous build:</para>
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320 |
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321 | <screen><userinput remap="pre">make clean
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322 | find .. -name "*.a" -delete</userinput></screen>
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323 |
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324 | <para>Configure Glibc for mx32 with the following commands:</para>
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325 |
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326 | <screen><userinput remap="configure">CC="$LFS_TGT-gcc -mx32" \
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327 | CXX="$LFS_TGT-g++ -mx32" \
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328 | ../configure \
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329 | --prefix=/usr \
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330 | --host=$LFS_TGTX32 \
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331 | --build=$(../scripts/config.guess) \
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332 | --enable-kernel=&min-kernel; \
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333 | --with-headers=$LFS/usr/include \
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334 | --enable-multi-arch \
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335 | --libdir=&usr-lib-mx32; \
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336 | --libexecdir=&usr-lib-mx32; \
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337 | libc_cv_slibdir=&lib-mx32;</userinput></screen>
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338 |
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339 | <para>Compile the package:</para>
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340 |
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341 | <screen><userinput remap="make">make</userinput></screen>
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342 |
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343 | <para>Install the package:</para>
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344 |
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345 | <screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
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346 | cp -a DESTDIR&lib-mx32;/* $LFS&lib-mx32;/
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347 | cp -a DESTDIR&usr-lib-mx32; $LFS/usr/
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348 | install -vm644 DESTDIR/usr/include/gnu/{lib-names,stubs}-x32.h \
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349 | $LFS/usr/include/gnu/
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350 | ln -svf ..&lib-mx32;/ld-linux-x32.so.2 $LFS/lib/ld-linux-x32.so.2</userinput></screen>
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351 |
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352 | <caution>
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353 | <para>At this point, it is imperative to stop and ensure that the basic
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354 | functions (compiling and linking) of the new toolchain are working as
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355 | expected. To perform a sanity check, run the following commands:</para>
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356 |
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357 | <screen><userinput>echo 'int main(){}' > dummy.c
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358 | $LFS_TGT-gcc -mx32 dummy.c
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359 | readelf -l a.out | grep '/ld-linux-x32'</userinput></screen>
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360 |
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361 | <para>If everything is working correctly, there should be no errors,
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362 | and the output of the last command will be of the form:</para>
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363 |
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364 | <screen><computeroutput>[Requesting program interpreter: /libx32/ld-linux-x32.so.2]</computeroutput></screen>
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365 |
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366 | <para>If the output is not shown as above or there was no output at all,
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367 | then something is wrong. Investigate and retrace the steps to find out
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368 | where the problem is and correct it. This issue must be resolved before
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369 | continuing on.</para>
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370 |
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371 | <para>Once all is well, clean up the test files:</para>
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372 |
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373 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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374 |
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375 | </caution>
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376 |
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377 | </sect2><!-- mx32 -->
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378 |
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379 | <sect2 role="content">
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380 | <title/>
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381 |
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382 | <para>Details on this package are located in
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383 | <xref linkend="contents-glibc" role="."/></para>
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384 |
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385 | </sect2>
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386 |
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387 | </sect1>
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