1 | <?xml version="1.0" encoding="UTF-8"?>
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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>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><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 | <note>
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59 | <para>
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60 | The above command is correct. The <command>ln</command> command has
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61 | several syntactic versions, so be sure to check
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62 | <command>info coreutils ln</command> and <ulink role='man'
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63 | url='&man;ln.1'>ln(1)</ulink> before reporting what may appear to be
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64 | an error.
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65 | </para>
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66 | </note>
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67 |
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68 | <para>Some of the Glibc programs use the non-FHS-compliant
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69 | <filename class="directory">/var/db</filename> directory to store their
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70 | runtime data. Apply the following patch to make such programs store their
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71 | runtime data in the FHS-compliant locations:</para>
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72 |
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73 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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74 |
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75 | <para>The Glibc documentation recommends building Glibc
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76 | in a dedicated build directory:</para>
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77 |
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78 | <screen><userinput remap="pre">mkdir -v build
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79 | cd build</userinput></screen>
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80 |
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81 | <para>Ensure that the <command>ldconfig</command> and <command>sln</command>
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82 | utilities are installed into
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83 | <filename class="directory">/usr/sbin</filename>:</para>
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84 |
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85 | <screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" > configparms</userinput></screen>
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86 |
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87 | <para>Next, prepare Glibc for compilation:</para>
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88 |
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89 | <screen><userinput remap="configure">../configure \
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90 | --prefix=/usr \
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91 | --host=$LFS_TGT \
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92 | --build=$(../scripts/config.guess) \
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93 | --enable-kernel=&min-kernel; \
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94 | --with-headers=$LFS/usr/include \
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95 | --disable-nscd \
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96 | libc_cv_slibdir=/usr/lib</userinput></screen>
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97 |
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98 | <variablelist>
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99 | <title>The meaning of the configure options:</title>
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100 |
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101 | <varlistentry>
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102 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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103 | <listitem>
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104 | <para>The combined effect of these switches is that Glibc's build system
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105 | configures itself to be cross-compiled, using the cross-linker and
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106 | cross-compiler in <filename class="directory">$LFS/tools</filename>.</para>
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107 | </listitem>
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108 | </varlistentry>
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109 |
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110 | <varlistentry>
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111 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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112 | <listitem>
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113 | <para>This tells Glibc to compile the library with support
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114 | for &min-kernel; and later Linux kernels. Workarounds for older
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115 | kernels are not enabled.</para>
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116 | </listitem>
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117 | </varlistentry>
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118 |
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119 | <varlistentry>
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120 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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121 | <listitem>
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122 | <para>This tells Glibc to compile itself against the headers
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123 | recently installed to the $LFS/usr/include directory, so that
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124 | it knows exactly what features the kernel has and can optimize
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125 | itself accordingly.</para>
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126 | </listitem>
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127 | </varlistentry>
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128 |
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129 | <varlistentry>
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130 | <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
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131 | <listitem>
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132 | <para>This ensures that the library is installed in /usr/lib instead
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133 | of the default /lib64 on 64-bit machines.</para>
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134 | </listitem>
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135 | </varlistentry>
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136 |
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137 | <varlistentry>
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138 | <term><parameter>--disable-nscd</parameter></term>
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139 | <listitem>
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140 | <para>Do not build the name service cache daemon which is no
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141 | longer used.</para>
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142 | </listitem>
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143 | </varlistentry>
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144 |
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145 | </variablelist>
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146 |
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147 | <para>During this stage the following warning might appear:</para>
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148 |
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149 | <blockquote>
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150 | <screen><computeroutput>configure: WARNING:
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151 | *** These auxiliary programs are missing or
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152 | *** incompatible versions: msgfmt
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153 | *** some features will be disabled.
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154 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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155 | </blockquote>
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156 |
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157 | <para>The missing or incompatible <command>msgfmt</command> program is
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158 | generally harmless. This <command>msgfmt</command> program is part of the
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159 | Gettext package, which the host distribution should provide.</para>
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160 |
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161 | <note><para>There have been reports that this package may fail when
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162 | building as a <quote>parallel make.</quote> If that occurs, rerun the make command
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163 | with the <option>-j1</option> option.</para></note>
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164 |
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165 | <para>Compile the package:</para>
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166 |
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167 | <screen><userinput remap="make">make</userinput></screen>
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168 |
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169 | <para>Install the package:</para>
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170 |
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171 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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172 | recommendations, you are building as
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173 | <systemitem class="username">root</systemitem>, the next command will
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174 | install the newly built Glibc to your host system, which will almost
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175 | certainly render it unusable. So double-check that the environment is
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176 | correctly set, and that you are not &root;, before running the following command.</para></warning>
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177 |
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178 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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179 |
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180 | <variablelist>
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181 | <title>The meaning of the <command>make install</command> option:</title>
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182 |
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183 | <varlistentry>
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184 | <term><parameter>DESTDIR=$LFS</parameter></term>
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185 | <listitem>
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186 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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187 | packages to define the location where the package should be
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188 | installed. If it is not set, it defaults to the root (<filename
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189 | class="directory">/</filename>) directory. Here we specify that
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190 | the package is installed in <filename class="directory">$LFS
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191 | </filename>, which will become the root directory in <xref linkend=
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192 | "ch-tools-chroot"/>.</para>
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193 | </listitem>
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194 | </varlistentry>
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195 |
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196 | </variablelist>
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197 |
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198 | <para>Fix a hard coded path to the executable loader in the
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199 | <command>ldd</command> script:</para>
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200 |
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201 | <screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd</userinput></screen>
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202 |
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203 | <caution>
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204 | <para>At this point, it is imperative to stop and ensure that the basic
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205 | functions (compiling and linking) of the new toolchain are working as
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206 | expected. To perform a sanity check, run the following commands:</para>
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207 |
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208 | <screen><userinput>echo 'int main(){}' | $LFS_TGT-gcc -xc -
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209 | readelf -l a.out | grep ld-linux</userinput></screen>
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210 |
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211 | <para>If everything is working correctly, there should be no errors,
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212 | and the output of the last command will be of the form:</para>
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213 |
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214 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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215 |
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216 | <para>Note that for 32-bit machines, the interpreter name will be
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217 | <filename>/lib/ld-linux.so.2</filename>.</para>
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218 |
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219 | <para>If the output is not as shown above, or there is no output at all,
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220 | then something is wrong. Investigate and retrace the steps to find out
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221 | where the problem is and correct it. This issue must be resolved before
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222 | continuing.</para>
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223 |
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224 | <para>Once all is well, clean up the test file:</para>
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225 |
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226 | <screen><userinput>rm -v a.out</userinput></screen>
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227 |
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228 | </caution>
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229 |
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230 | <note><para>Building the packages in the next chapter will serve as an
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231 | additional check that the toolchain has been built properly. If some
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232 | package, especially Binutils-pass2 or GCC-pass2, fails to build, it is
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233 | an indication that something has gone wrong with the
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234 | preceding Binutils, GCC, or Glibc installations.</para></note>
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235 | <!--
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236 | <para>Now that our cross-toolchain is complete, finalize the installation
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237 | of the limits.h header. To do this, run a utility provided by the GCC
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238 | developers:</para>
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239 |
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240 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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241 | -->
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242 | </sect2>
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243 |
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244 | <sect2 role="content">
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245 | <title/>
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246 |
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247 | <para>Details on this package are located in
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248 | <xref linkend="contents-glibc" role="."/></para>
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249 |
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250 | </sect2>
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251 |
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252 | </sect1>
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