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="../chapter06/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-ch5-sbu;</seg>
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37 | <seg>&glibc-ch5-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>The Glibc documentation recommends building Glibc
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47 | in a dedicated build directory:</para>
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48 |
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49 | <screen><userinput remap="pre">mkdir -v build
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50 | cd build</userinput></screen>
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51 |
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52 | <para>Next, prepare Glibc for compilation:</para>
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53 |
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54 | <screen><userinput remap="configure">../configure \
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55 | --prefix=/tools \
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56 | --host=$LFS_TGT \
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57 | --build=$(../scripts/config.guess) \
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58 | --enable-kernel=&min-kernel; \
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59 | --with-headers=/tools/include</userinput></screen>
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60 | <!--
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61 | libc_cv_forced_unwind=yes \
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62 | libc_cv_c_cleanup=yes</userinput></screen> -->
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63 |
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64 | <variablelist>
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65 | <title>The meaning of the configure options:</title>
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66 |
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67 | <varlistentry>
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68 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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69 | <listitem>
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70 | <para>The combined effect of these switches is that Glibc's build system
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71 | configures itself to cross-compile, using the cross-linker and
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72 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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73 | </listitem>
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74 | </varlistentry>
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75 |
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76 | <varlistentry>
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77 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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78 | <listitem>
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79 | <para>This tells Glibc to compile the library with support
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80 | for &min-kernel; and later Linux kernels. Workarounds for older
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81 | kernels are not enabled.</para>
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82 | </listitem>
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83 | </varlistentry>
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84 |
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85 | <varlistentry arch="ml_32,ml_x32,ml_all">
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86 | <term><parameter>--enable-multi-arch</parameter></term>
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87 | <listitem>
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88 | <para>Enables glibc for multiarch environments.</para>
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89 | </listitem>
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90 | </varlistentry>
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91 |
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92 | <varlistentry>
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93 | <term><parameter>--with-headers=/tools/include</parameter></term>
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94 | <listitem>
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95 | <para>This tells Glibc to compile itself against the headers recently
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96 | installed to the tools directory, so that it knows exactly what
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97 | features the kernel has and can optimize itself accordingly.</para>
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98 | </listitem>
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99 | </varlistentry>
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100 | <!--
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101 | <varlistentry>
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102 | <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
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103 | <listitem>
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104 | <para>The linker installed during
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105 | <xref linkend="ch-tools-binutils-pass1"/> was cross-compiled and as
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106 | such cannot be used until Glibc has been installed. This means that
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107 | the configure test for force-unwind support will fail, as it relies on
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108 | a working linker. The libc_cv_forced_unwind=yes variable is passed in
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109 | order to inform <command>configure</command> that force-unwind
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110 | support is available without it having to run the test.</para>
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111 | </listitem>
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112 | </varlistentry>
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113 | <varlistentry>
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114 | <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
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115 | <listitem>
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116 | <para>Similarly, we pass libc_cv_c_cleanup=yes through to the
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117 | <command>configure</command> script so that the test is skipped and C
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118 | cleanup handling support is configured.</para>
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119 | </listitem>
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120 | </varlistentry>
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121 | -->
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122 | <!-- <varlistentry>
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123 | <term><parameter>libc_cv_ctors_header=yes</parameter></term>
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124 | <listitem>
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125 | <para>Similarly, we pass libc_cv_ctors_header=yes through to the
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126 | <command>configure</command> script so that the test is skipped and
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127 | gcc constructor support is configured.</para>
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128 | </listitem>
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129 | </varlistentry>-->
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130 |
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131 | </variablelist>
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132 |
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133 | <para>During this stage the following warning might appear:</para>
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134 |
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135 | <blockquote>
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136 | <screen><computeroutput>configure: WARNING:
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137 | *** These auxiliary programs are missing or
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138 | *** incompatible versions: msgfmt
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139 | *** some features will be disabled.
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140 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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141 | </blockquote>
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142 |
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143 | <para>The missing or incompatible <command>msgfmt</command> program is
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144 | generally harmless. This <command>msgfmt</command> program is part of the
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145 | Gettext package which the host distribution should provide.</para>
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146 |
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147 | <note><para>There have been reports that this package may fail when
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148 | building as a "parallel make". If this occurs, rerun the make command
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149 | with a "-j1" option.</para></note>
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150 |
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151 | <para>Compile the package:</para>
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152 |
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153 | <screen><userinput remap="make">make</userinput></screen>
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154 |
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155 | <para>Install the package:</para>
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156 |
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157 | <screen><userinput remap="install">make install</userinput></screen>
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158 |
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159 | <caution>
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160 | <para>At this point, it is imperative to stop and ensure that the basic
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161 | functions (compiling and linking) of the new toolchain are working as
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162 | expected. To perform a sanity check, run the following commands:</para>
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163 |
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164 | <screen><userinput>echo 'int main(){}' > dummy.c
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165 | $LFS_TGT-gcc dummy.c
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166 | readelf -l a.out | grep ': /tools'</userinput></screen>
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167 |
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168 | <para>If everything is working correctly, there should be no errors,
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169 | and the output of the last command will be of the form:</para>
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170 |
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171 | <screen><computeroutput>[Requesting program interpreter: /tools/lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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172 |
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173 | <para>Note that for 32-bit machines, the interpreter name will be
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174 | <filename>/tools/lib/ld-linux.so.2</filename>.</para>
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175 |
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176 | <para>If the output is not shown as above or there was no output at all,
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177 | then something is wrong. Investigate and retrace the steps to find out
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178 | where the problem is and correct it. This issue must be resolved before
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179 | continuing on.</para>
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180 |
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181 | <para>Once all is well, clean up the test files:</para>
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182 |
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183 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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184 |
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185 | </caution>
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186 |
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187 | <note><para>Building Binutils in the section after next will serve as an
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188 | additional check that the toolchain has been built properly. If Binutils
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189 | fails to build, it is an indication that something has gone wrong with the
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190 | previous Binutils, GCC, or Glibc installations.</para></note>
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191 |
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192 | </sect2>
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193 |
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194 | <sect2 arch="ml_32,ml_all" role="installation">
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195 | <title>Installation of Glibc 32-bit</title>
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196 |
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197 | <para>Clean the build directory for redoing glibc for 32-bit:</para>
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198 | <screen><userinput remap="pre">mkdir ../build32
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199 | cd ../build32</userinput></screen>
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200 |
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201 | <para>Rebuild glibc for 32-bit:</para>
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202 | <screen><userinput remap="configure">echo slibdir=/tools/lib32 > configparms
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203 | BUILD_CC="gcc -m32" \
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204 | CC="${LFS_TGT}-gcc -m32" \
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205 | CXX="${LFS_TGT}-g++ -m32" \
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206 | AR="${LFS_TGT}-ar" \
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207 | RANLIB="${LFS_TGT}-ranlib" \
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208 | ../configure --prefix=/tools \
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209 | --build=$(../scripts/config.guess) \
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210 | --host=${LFS_TGT32} \
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211 | --enable-kernel=&min-kernel; \
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212 | --enable-multi-arch \
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213 | --libdir=/tools/lib32 \
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214 | --libexecdir=/tools/lib32 \
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215 | --with-headers=/tools/include \
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216 | --with-binutils=/tools/bin</userinput></screen>
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217 | <!-- \
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218 | libc_cv_forced_unwind=yes \
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219 | libc_cv_c_cleanup=yes</userinput></screen> -->
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220 |
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221 | <para>Now compile the 32-bit version of glibc:</para>
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222 | <screen><userinput remap="make">make</userinput></screen>
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223 |
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224 | <para>Install 32-bit version of glibc:</para>
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225 | <screen><userinput remap="install">make install_root="${PWD}/DESTDIR" install
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226 | install -vdm755 /tools/lib32
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227 | cp -Rv DESTDIR/tools/lib32/* /tools/lib32
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228 | install -vm644 DESTDIR/tools/include/gnu/{lib-names,stubs}-32.h \
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229 | /tools/include/gnu/
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230 | ln -svf /tools/lib32/ld-linux.so.2 /tools/lib/
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231 | cd ..</userinput></screen>
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232 |
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233 | </sect2>
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234 |
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235 | <sect2 arch="ml_x32,ml_all" role="installation">
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236 | <title>Installation of Glibc x32-bit</title>
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237 |
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238 | <para>Create a build directory for redoing glibc for x32-bit:</para>
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239 | <screen><userinput remap="pre">mkdir build32x
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240 | cd build32x</userinput></screen>
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241 |
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242 | <para>Rebuild glibc for x32-bit:</para>
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243 | <screen><userinput remap="configure">echo slibdir=/tools/libx32 > configparms
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244 | BUILD_CC="gcc -mx32" \
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245 | CC="${LFS_TGT}-gcc -mx32" \
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246 | CXX="${LFS_TGT}-g++ -mx32" \
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247 | AR="${LFS_TGT}-ar" \
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248 | RANLIB="${LFS_TGT}-ranlib" \
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249 | ../configure --prefix=/tools \
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250 | --build=$(../scripts/config.guess) \
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251 | --host=${LFS_TGTX32} \
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252 | --enable-kernel=&min-kernel; \
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253 | --enable-multi-arch \
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254 | --libdir=/tools/libx32 \
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255 | --libexecdir=/tools/libx32 \
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256 | --with-headers=/tools/include \
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257 | --with-binutils=/tools/bin</userinput></screen>
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258 | <!-- \
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259 | libc_cv_forced_unwind=yes \
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260 | libc_cv_c_cleanup=yes</userinput></screen> -->
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261 |
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262 | <para>Now compile the x32-bit version of glibc:</para>
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263 | <screen><userinput remap="make">make</userinput></screen>
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264 |
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265 | <para>Install x32-bit version of glibc:</para>
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266 | <screen><userinput remap="install">make install_root="${PWD}/DESTDIR" install
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267 | install -vdm755 /tools/libx32
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268 | cp -Rv DESTDIR/tools/libx32/* /tools/libx32
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269 | install -vm644 DESTDIR/tools/include/gnu/lib-names-x32.h \
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270 | /tools/include/gnu/
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271 | [ -e DESTDIR/tools/include/gnu/stubs-x32.h ] \
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272 | && install -vm644 DESTDIR/tools/include/gnu/stubs-x32.h /tools/include/gnu/ \
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273 | || ln -v /tools/include/gnu/stubs-64.h /tools/include/gnu/stubs-x32.h
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274 | ln -svf /tools/libx32/ld-linux-x32.so.2 /tools/lib/</userinput></screen>
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275 | <!-- For whatever reason the stubs-x32.h doesn't get created. The 'ln' above is
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276 | just a "brute force" workaraound - by copying the stubs-64.h file. -->
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277 |
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278 | <caution>
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279 | <para>At this point, it is imperative to stop and ensure that the basic
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280 | functions (compiling and linking) of the new toolchain are working as
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281 | expected. To perform a sanity check, run the following commands:</para>
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282 |
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283 | <screen><userinput>echo 'int main(){}' > dummy.c
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284 | $LFS_TGT-gcc -m32 dummy.c
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285 | readelf -l a.out | grep ': /tools'</userinput></screen>
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286 |
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287 | <para>If everything is working correctly, there should be no errors,
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288 | and the output of the last command will be of the form:</para>
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289 |
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290 | <screen><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux.so.2]</computeroutput></screen>
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291 |
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292 | <para>Redo test for x32-ABI:</para>
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293 |
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294 | <screen><userinput>echo 'int main(){}' > dummy.c
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295 | $LFS_TGT-gcc -mx32 dummy.c
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296 | readelf -l a.out | grep ': /tools'</userinput></screen>
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297 |
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298 | <para>Output should be like:</para>
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299 |
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300 | <screen><computeroutput>[Requesting program interpreter: /tools/libx32/ld-linux-x32.so.2]</computeroutput></screen>
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301 |
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302 | <para>If the output is not shown as above or there was no output at all,
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303 | then something is wrong. Investigate and retrace the steps to find out
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304 | where the problem is and correct it. This issue must be resolved before
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305 | continuing on.</para>
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306 |
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307 | <para>Once all is well, clean up the test files:</para>
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308 |
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309 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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310 |
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311 | </caution>
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312 | </sect2>
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313 |
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314 | <sect2 role="content">
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315 | <title/>
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316 |
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317 | <para>Details on this package are located in
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318 | <xref linkend="contents-glibc" role="."/></para>
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319 |
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320 | </sect2>
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321 |
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322 | </sect1>
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