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/2003/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>Fix a potential issue if <filename>/etc/ld.so.preload</filename> is
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47 | used on the host system.</para>
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48 |
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49 | <screen><userinput remap="pre">sed -i 's@/etc/ld.so.preload@/tools/etc/ld.so.preload@' elf/rtld.c</userinput></screen>
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50 |
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51 | <para>The Glibc documentation recommends building Glibc outside of the source
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52 | directory in a dedicated build directory:</para>
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53 |
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54 | <screen><userinput remap="pre">mkdir -v ../glibc-build
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55 | cd ../glibc-build</userinput></screen>
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56 |
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57 | <para>Because Glibc no longer supports i386, its developers say to use the
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58 | compiler flag <parameter>-march=i486</parameter> when building it for x86
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59 | machines. There are several ways to accomplish that, but testing shows that
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60 | the flag is best placed inside the build variable <quote>CFLAGS</quote>.
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61 | Instead of overriding completely what Glibc's internal build system uses
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62 | for CFLAGS, append the new flag to the existing contents of CFLAGS by
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63 | making use of the special file <filename>configparms</filename>. The
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64 | -mtune=native flag is also necessary to reset a reasonable value for -mtune
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65 | that is changed when setting -march.</para>
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66 |
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67 | <screen><userinput remap="configure">case `uname -m` in
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68 | i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
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69 | esac</userinput></screen>
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70 |
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71 | <para>Next, prepare Glibc for compilation:</para>
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72 |
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73 | <screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/tools \
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74 | --disable-profile --enable-add-ons \
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75 | --enable-kernel=2.6.0 --with-binutils=/tools/bin \
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76 | --without-gd --with-headers=/tools/include \
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77 | --without-selinux</userinput></screen>
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78 |
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79 | <variablelist>
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80 | <title>The meaning of the configure options:</title>
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81 |
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82 | <varlistentry>
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83 | <term><parameter>--disable-profile</parameter></term>
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84 | <listitem>
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85 | <para>This builds the libraries without profiling information. Omit
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86 | this option if profiling on the temporary tools is necessary.</para>
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87 | </listitem>
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88 | </varlistentry>
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89 |
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90 | <varlistentry>
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91 | <term><parameter>--enable-add-ons</parameter></term>
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92 | <listitem>
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93 | <para>This tells Glibc to use the NPTL add-on as its threading
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94 | library.</para>
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95 | </listitem>
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96 | </varlistentry>
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97 |
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98 | <varlistentry>
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99 | <term><parameter>--enable-kernel=2.6.0</parameter></term>
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100 | <listitem>
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101 | <para>This tells Glibc to compile the library with support
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102 | for 2.6.x Linux kernels.</para>
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103 | </listitem>
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104 | </varlistentry>
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105 |
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106 | <varlistentry>
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107 | <term><parameter>--with-binutils=/tools/bin</parameter></term>
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108 | <listitem>
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109 | <para>While not required, this switch ensures that there are
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110 | no errors pertaining to which Binutils programs get used during the
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111 | Glibc build.</para>
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112 | </listitem>
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113 | </varlistentry>
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114 |
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115 | <varlistentry>
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116 | <term><parameter>--without-gd</parameter></term>
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117 | <listitem>
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118 | <para>This prevents the build of the <command>memusagestat</command>
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119 | program, which insists on linking against the host's libraries
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120 | (libgd, libpng, libz, etc.).</para>
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121 | </listitem>
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122 | </varlistentry>
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123 |
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124 | <varlistentry>
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125 | <term><parameter>--with-headers=/tools/include</parameter></term>
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126 | <listitem>
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127 | <para>This tells Glibc to compile itself against the headers recently
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128 | installed to the tools directory, so that it knows exactly what
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129 | features the kernel has and can optimize 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>--without-selinux</parameter></term>
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135 | <listitem>
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136 | <para>When building from hosts that include SELinux functionality
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137 | (e.g., Fedora Core 3), Glibc will build with support for SELinux.
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138 | As the LFS tools environment does not contain support for SELinux, a
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139 | Glibc compiled with such support will fail to operate correctly.</para>
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140 | </listitem>
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141 | </varlistentry>
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142 |
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143 | </variablelist>
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144 |
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145 | <para>During this stage the following warning might appear:</para>
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146 |
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147 | <blockquote>
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148 | <screen><computeroutput>configure: WARNING:
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149 | *** These auxiliary programs are missing or
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150 | *** incompatible versions: msgfmt
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151 | *** some features will be disabled.
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152 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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153 | </blockquote>
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154 |
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155 | <para>The missing or incompatible <command>msgfmt</command> program is
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156 | generally harmless, but it can sometimes cause issues when running the
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157 | test suite. This <command>msgfmt</command> program is part of the
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158 | Gettext package which the host distribution should provide. If
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159 | <command>msgfmt</command> is present but deemed incompatible, upgrade
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160 | the host system's Gettext package or continue without it and see if
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161 | the test suite runs without problems regardless.</para>
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162 |
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163 | <para>Compile the package:</para>
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164 |
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165 | <screen><userinput remap="make">make</userinput></screen>
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166 |
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167 | <para>This package does come with a test suite, however, it cannot be
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168 | run at this time because we do not have a C++ compiler yet.</para>
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169 |
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170 | <para>The install stage of Glibc will issue a harmless warning at the
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171 | end about the absence of <filename>/tools/etc/ld.so.conf</filename>.
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172 | Prevent this warning with:</para>
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173 |
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174 | <screen><userinput remap="install">mkdir -v /tools/etc
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175 | touch /tools/etc/ld.so.conf</userinput></screen>
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176 |
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177 | <para>Install the package:</para>
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178 |
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179 | <screen><userinput remap="install">make install</userinput></screen>
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180 |
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181 | <para>Different countries and cultures have varying conventions for
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182 | how to communicate. These conventions range from the format for
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183 | representing dates and times to more complex issues, such as the
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184 | language spoken. The <quote>internationalization</quote> of GNU
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185 | programs works by locale.</para>
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186 |
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187 | <note>
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188 | <para>If the test suites are not being run in this chapter (as per
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189 | the recommendation), there is no need to install the locales now.
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190 | The appropriate locales will be installed in the next chapter.
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191 | To install the Glibc locales anyway, use instructions from
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192 | <xref linkend="ch-system-glibc" role="."/></para>
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193 | </note>
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194 |
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195 | </sect2>
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196 |
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197 | <sect2 role="content">
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198 | <title/>
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199 |
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200 | <para>Details on this package are located in
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201 | <xref linkend="contents-glibc" role="."/></para>
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202 |
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203 | </sect2>
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204 |
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205 | </sect1>
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