1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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4 | %general-entities;
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5 | ]>
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6 | <sect1 id="ch-tools-glibc" role="wrap">
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7 | <title>Glibc-&glibc-version;</title>
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8 | <?dbhtml filename="glibc.html"?>
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9 |
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10 | <indexterm zone="ch-tools-glibc">
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11 | <primary sortas="a-Glibc">Glibc</primary>
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12 | <secondary>tools</secondary></indexterm>
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13 |
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14 | <sect2 role="package"><title/>
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15 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="../chapter06/glibc.xml" xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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16 |
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17 | <segmentedlist>
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18 | <segtitle>&buildtime;</segtitle>
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19 | <segtitle>&diskspace;</segtitle>
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20 | <seglistitem><seg>11.8 SBU</seg><seg>800 MB</seg></seglistitem>
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21 | </segmentedlist>
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22 |
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23 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="../chapter06/glibc.xml" xpointer="xpointer(/sect1/sect2[1]/segmentedlist[2])"/>
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24 |
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25 | </sect2>
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26 |
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27 | <sect2 role="installation">
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28 | <title>Installation of Glibc</title>
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29 |
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30 | <para>This package is known to behave badly when you change its default
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31 | optimization flags (including the <parameter>-march</parameter> and
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32 | <parameter>-mcpu</parameter> options). Therefore, if you have defined any
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33 | environment variables that override default optimizations, such as CFLAGS and
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34 | CXXFLAGS, we recommend un-setting them when building Glibc.</para>
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35 |
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36 | <para>Basically, compiling Glibc in any other way than the book suggests
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37 | is putting the stability of your system at risk.</para>
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38 |
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39 | <para>The Glibc documentation recommends building Glibc outside of the source
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40 | directory in a dedicated build directory:</para>
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41 |
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42 | <screen><userinput>mkdir ../glibc-build
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43 | cd ../glibc-build</userinput></screen>
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44 |
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45 | <para>Next, prepare Glibc for compilation:</para>
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46 |
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47 | <screen><userinput>../glibc-&glibc-version;/configure --prefix=/tools \
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48 | --disable-profile --enable-add-ons=nptl --with-tls \
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49 | --with-binutils=/tools/bin --without-gd --without-cvs \
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50 | --with-headers=/tools/glibc-kernheaders</userinput></screen>
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51 |
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52 | <para>The meaning of the configure options:</para>
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53 |
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54 | <variablelist>
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55 | <varlistentry>
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56 | <term><parameter>--disable-profile</parameter></term>
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57 | <listitem><para>This builds the
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58 | libraries without profiling information. Omit this option if you plan to do
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59 | profiling on the temporary tools.</para></listitem>
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60 | </varlistentry>
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61 |
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62 | <varlistentry>
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63 | <term><parameter>--enable-add-ons=nptl</parameter></term>
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64 | <listitem><para>This tells Glibc to use the NPTL add-on as its threading
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65 | library.</para></listitem>
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66 | </varlistentry>
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67 |
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68 | <varlistentry>
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69 | <term><parameter>--with-tls</parameter></term>
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70 | <listitem><para>This tells Glibc to include support for TLS (thread-local storage).
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71 | This is required for NPTL to work. </para></listitem>
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72 | </varlistentry>
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73 |
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74 | <varlistentry>
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75 | <term><parameter>--with-binutils=/tools/bin</parameter></term>
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76 | <listitem><para>Strictly speaking this switch is not required. But it does ensure
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77 | nothing can go wrong with regard to what Binutils programs get used during the
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78 | Glibc build.</para></listitem>
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79 | </varlistentry>
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80 |
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81 | <varlistentry>
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82 | <term><parameter>--without-gd</parameter></term>
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83 | <listitem><para>This prevents the build of the <command>memusagestat</command>
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84 | program, which strangely enough insists on linking against the host's libraries
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85 | (libgd, libpng, libz, and so forth). </para></listitem>
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86 | </varlistentry>
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87 |
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88 | <varlistentry>
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89 | <term><parameter>--without-cvs</parameter></term>
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90 | <listitem><para>This is meant to prevent
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91 | the Makefiles from attempting automatic CVS checkouts when using a CVS
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92 | snapshot. But it's not actually needed these days. We use it because it
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93 | suppresses an annoying but harmless warning about a missing
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94 | <command>autoconf</command> program.</para></listitem>
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95 | </varlistentry>
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96 |
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97 | <varlistentry>
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98 | <term><parameter>--with-headers=/tools/glibc-kernheaders</parameter></term>
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99 | <listitem><para>This tells Glibc to compile against the <quote>raw</quote>
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100 | kernel headers, so that it knows exactly what features the kernel has, and can
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101 | optimize itself accordingly. Not strictly necessary, but nice to have.</para></listitem>
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102 | </varlistentry>
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103 | </variablelist>
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104 |
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105 | <para>During this stage you might see the following warning:</para>
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106 |
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107 | <blockquote><screen><computeroutput>configure: WARNING:
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108 | *** These auxiliary programs are missing or incompatible versions: msgfmt
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109 | *** some features will be disabled.
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110 | *** Check the INSTALL file for required versions.</computeroutput></screen></blockquote>
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111 |
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112 | <para>The missing or incompatible <command>msgfmt</command> program is
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113 | generally harmless, but it's believed it can sometimes cause problems when
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114 | running the test suite.</para>
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115 |
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116 | <para>Compile the package:</para>
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117 |
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118 | <screen><userinput>make</userinput></screen>
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119 |
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120 | <para>Compilation is now complete. As mentioned earlier, we don't recommend
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121 | running the test suites for the temporary system here in this chapter. If you
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122 | still want to run the Glibc test suite anyway, the following command will do
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123 | so:</para>
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124 |
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125 | <screen><userinput>make check</userinput></screen>
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126 |
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127 | <para>The Glibc test suite is highly dependent on certain functions of your host
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128 | system, in particular the kernel. Additionally, here in this chapter some tests
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129 | can be adversely affected by existing tools or environmental issues on the host
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130 | system. Of course, these won't be a problem when we run the Glibc test suite
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131 | inside the chroot environment of <xref linkend="chapter-building-system"/>. In
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132 | general, the Glibc test suite is always expected to pass. However, as mentioned
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133 | above, in certain circumstances some failures are unavoidable. Here is a list
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134 | of the most common issues we are aware of:</para>
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135 |
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136 | <itemizedlist>
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137 | <listitem><para>The <emphasis>math</emphasis> tests sometimes fail when running
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138 | on systems where the CPU is not a relatively new genuine Intel or authentic AMD.
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139 | Certain optimization settings are also known to be a factor here.</para></listitem>
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140 |
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141 | <listitem><para>The <emphasis>gettext</emphasis> test sometimes fails due to
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142 | host system issues. The exact reasons are not yet clear.</para></listitem>
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143 |
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144 | <listitem><para>The <emphasis>atime</emphasis> test sometimes fails when the
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145 | LFS partition is mounted with the <parameter>noatime</parameter> option, or due
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146 | to other file system quirks.</para></listitem>
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147 |
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148 | <listitem><para>The <emphasis>shm</emphasis> test might fail when the host
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149 | system is running the devfs file system but doesn't have the <systemitem class="filesystem">tmpfs</systemitem> file system
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150 | mounted at <filename class="directory">/dev/shm</filename> due to lack of support for tmpfs in
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151 | the kernel.</para></listitem>
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152 |
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153 | <listitem><para>When running on older and slower hardware, some tests might
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154 | fail due to test timeouts being exceeded.</para></listitem>
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155 | </itemizedlist>
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156 |
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157 | <para>In summary, don't worry too much if you see Glibc test suite failures
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158 | here in this chapter. The Glibc in <xref linkend="chapter-building-system"/> is
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159 | the one we'll ultimately end up using, so that is the one we would really like
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160 | to see pass the tests (but even there some failures could still occur -- the
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161 | <emphasis>math</emphasis> tests, for example). When experiencing a failure,
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162 | make a note of it, then continue by reissuing the <command>make
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163 | check</command>. The test suite should pick up where it left off and continue.
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164 | You can circumvent this stop-start sequence by issuing a <command>make -k
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165 | check</command>. But if you do that, be sure to log the output so that you can
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166 | later peruse the log file and examine the total number of failures.</para>
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167 |
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168 | <para>Though it is a harmless message, the install stage of Glibc will at the
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169 | end complain about the absence of <filename>/tools/etc/ld.so.conf</filename>.
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170 | Prevent this confusing little warning with:</para>
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171 |
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172 | <screen><userinput>mkdir /tools/etc
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173 | touch /tools/etc/ld.so.conf</userinput></screen>
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174 |
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175 | <para>Now install the package:</para>
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176 |
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177 | <screen><userinput>make install</userinput></screen>
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178 |
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179 | <para>Different countries and cultures have varying conventions for how to
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180 | communicate. These conventions range from very simple ones, such as the format
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181 | for representing dates and times, to very complex ones, such as the language
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182 | spoken. The <quote>internationalization</quote> of GNU programs works by means
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183 | of <emphasis>locales</emphasis>.</para>
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184 |
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185 | <note><para>If you are not running the test suites here in this chapter as per
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186 | our recommendation, there is little point in installing the locales now. We'll
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187 | be installing the locales in the next chapter.</para></note>
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188 |
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189 | <para>If you still want to install the Glibc locales anyway, the following
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190 | command will do so:</para>
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191 |
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192 | <screen><userinput>make localedata/install-locales</userinput></screen>
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193 |
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194 | <para>An alternative to running the previous command is to install only those
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195 | locales which you need or want. This can be achieved by using the
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196 | <command>localedef</command> command. Information on this can be found in
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197 | the <filename>INSTALL</filename> file in the Glibc source. However, there are
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198 | a number of locales that are essential for the tests of future packages to
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199 | pass, in particular, the <emphasis>libstdc++</emphasis> tests from GCC. The
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200 | following instructions, instead of the install-locales target above, will
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201 | install the minimum set of locales necessary for the tests to run
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202 | successfully:</para>
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203 |
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204 | <screen><userinput>mkdir -p /tools/lib/locale
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205 | localedef -i de_DE -f ISO-8859-1 de_DE
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206 | localedef -i de_DE@euro -f ISO-8859-15 de_DE@euro
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207 | localedef -i en_HK -f ISO-8859-1 en_HK
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208 | localedef -i en_PH -f ISO-8859-1 en_PH
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209 | localedef -i en_US -f ISO-8859-1 en_US
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210 | localedef -i es_MX -f ISO-8859-1 es_MX
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211 | localedef -i fa_IR -f UTF-8 fa_IR
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212 | localedef -i fr_FR -f ISO-8859-1 fr_FR
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213 | localedef -i fr_FR@euro -f ISO-8859-15 fr_FR@euro
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214 | localedef -i it_IT -f ISO-8859-1 it_IT
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215 | localedef -i ja_JP -f EUC-JP ja_JP</userinput></screen>
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216 |
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217 | </sect2>
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218 |
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219 | <sect2 role="content"><title/>
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220 | <para>The details on this package are found in <xref linkend="contents-glibc"/>.</para>
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221 | </sect2>
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222 |
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223 | </sect1>
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