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>The Glibc documentation recommends building Glibc outside of the source
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47 | directory in a dedicated build directory:</para>
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48 |
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49 | <screen><userinput remap="pre">mkdir -v ../glibc-build
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50 | cd ../glibc-build</userinput></screen>
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51 |
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52 | <para>Because Glibc no longer supports i386, its developers say to use the
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53 | compiler flag <parameter>-march=i486</parameter> when building it for x86
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54 | machines. There are several ways to accomplish that, but testing shows that
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55 | the flag is best placed inside the build variable <quote>CFLAGS</quote>.
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56 | Instead of overriding completely what Glibc's internal build system uses
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57 | for CFLAGS, append the new flag to the existing contents of CFLAGS by
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58 | making use of the special file <filename>configparms</filename>. The
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59 | -mtune=native flag is also necessary to reset a reasonable value for -mtune
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60 | that is changed when setting -march.</para>
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61 |
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62 | <screen><userinput remap="configure">case `uname -m` in
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63 | i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
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64 | esac</userinput></screen>
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65 |
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66 | <para>Next, prepare Glibc for compilation:</para>
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67 |
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68 | <screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/tools \
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69 | --host=$LFS_TGT --build=$(../glibc-&glibc-version;/scripts/config.guess) \
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70 | --disable-profile --enable-add-ons \
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71 | --enable-kernel=2.6.0 --with-headers=/tools/include \
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72 | libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes</userinput></screen>
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73 |
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74 | <variablelist>
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75 | <title>The meaning of the configure options:</title>
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76 |
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77 | <varlistentry>
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78 | <term><parameter>--host=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
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79 | <listitem>
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80 | <para>The combined effect of these switches is that Glibc's build system
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81 | configures itself to cross-compile, using the cross-linker and
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82 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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83 | </listitem>
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84 | </varlistentry>
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85 |
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86 | <varlistentry>
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87 | <term><parameter>--disable-profile</parameter></term>
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88 | <listitem>
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89 | <para>This builds the libraries without profiling information. Omit
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90 | this option if profiling on the temporary tools is necessary.</para>
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91 | </listitem>
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92 | </varlistentry>
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93 |
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94 | <varlistentry>
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95 | <term><parameter>--enable-add-ons</parameter></term>
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96 | <listitem>
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97 | <para>This tells Glibc to use the NPTL add-on as its threading
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98 | library.</para>
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99 | </listitem>
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100 | </varlistentry>
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101 |
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102 | <varlistentry>
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103 | <term><parameter>--enable-kernel=2.6.0</parameter></term>
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104 | <listitem>
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105 | <para>This tells Glibc to compile the library with support
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106 | for 2.6.x Linux kernels.</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>--with-headers=/tools/include</parameter></term>
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112 | <listitem>
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113 | <para>This tells Glibc to compile itself against the headers recently
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114 | installed to the tools directory, so that it knows exactly what
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115 | features the kernel has and can optimize itself accordingly.</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>libc_cv_forced_unwind=yes</parameter></term>
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121 | <listitem>
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122 | <para>The build requires support for forced unwind, but because it is
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123 | being cross compiled, it cannot auto detect it. Setting this variable
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124 | on the command line explicitly tells the
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125 | <command>configure</command> script that support is available.</para>
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126 | </listitem>
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127 | </varlistentry>
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128 | <varlistentry>
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129 | <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
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130 | <listitem>
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131 | <para>The build also requires support for C cleanup handling, which it
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132 | cannot auto detect when being cross compiled. Enable it explicitly.</para>
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133 | </listitem>
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134 | </varlistentry>
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135 |
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136 | </variablelist>
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137 |
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138 | <para>During this stage the following warning might appear:</para>
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139 |
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140 | <blockquote>
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141 | <screen><computeroutput>configure: WARNING:
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142 | *** These auxiliary programs are missing or
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143 | *** incompatible versions: msgfmt
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144 | *** some features will be disabled.
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145 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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146 | </blockquote>
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147 |
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148 | <para>The missing or incompatible <command>msgfmt</command> program is
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149 | generally harmless, but it can sometimes cause issues when running the
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150 | test suite. This <command>msgfmt</command> program is part of the
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151 | Gettext package which the host distribution should provide. If
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152 | <command>msgfmt</command> is present but deemed incompatible, upgrade
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153 | the host system's Gettext package or continue without it and see if
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154 | the test suite runs without problems regardless.</para>
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155 |
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156 | <para>Compile the package:</para>
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157 |
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158 | <screen><userinput remap="make">make</userinput></screen>
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159 |
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160 | <para>This package does come with a test suite, however, it cannot be
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161 | run at this time because we do not have a C++ compiler yet.</para>
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162 |
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163 | <para>Install the package:</para>
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164 |
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165 | <screen><userinput remap="install">make install</userinput></screen>
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166 |
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167 | <para>Different countries and cultures have varying conventions for
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168 | how to communicate. These conventions range from the format for
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169 | representing dates and times to more complex issues, such as the
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170 | language spoken. The <quote>internationalization</quote> of GNU
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171 | programs works by locale.</para>
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172 |
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173 | <note>
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174 | <para>If the test suites are not being run in this chapter (as per
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175 | the recommendation), there is no need to install the locales now.
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176 | The appropriate locales will be installed in the next chapter.
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177 | To install the Glibc locales anyway, use instructions from
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178 | <xref linkend="ch-system-glibc" role="."/></para>
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179 | </note>
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180 |
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181 | </sect2>
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182 |
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183 | <sect2 role="content">
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184 | <title/>
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185 |
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186 | <para>Details on this package are located in
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187 | <xref linkend="contents-glibc" role="."/></para>
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188 |
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189 | </sect2>
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190 |
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191 | </sect1>
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