source: chapter05/glibc.xml@ d125a6b

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Last change on this file since d125a6b was d125a6b, checked in by Pierre Labastie <pieere@…>, 18 months ago

Add forgotten "case" in glibc chapter 5

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11942 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-tools-glibc" role="wrap">
9 <?dbhtml filename="glibc.html"?>
10
11 <sect1info condition="script">
12 <productname>glibc</productname>
13 <productnumber>&glibc-version;</productnumber>
14 <address>&glibc-url;</address>
15 </sect1info>
16
17 <title>Glibc-&glibc-version;</title>
18
19 <indexterm zone="ch-tools-glibc">
20 <primary sortas="a-Glibc">Glibc</primary>
21 <secondary>tools</secondary>
22 </indexterm>
23
24 <sect2 role="package">
25 <title/>
26
27 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
28 href="../chapter08/glibc.xml"
29 xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&glibc-tmp-sbu;</seg>
37 <seg>&glibc-tmp-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <para>First, create a symbolic link for LSB compliance. Additionally,
47 for x86_64, create a compatibility symbolic link required for proper
48 operation of the dynamic library loader:</para>
49
50<screen><userinput remap="pre">case $(uname -m) in
51 i?86) ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3
52 ;;
53 x86_64) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
54 ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3
55 ;;
56esac</userinput></screen>
57
58 <para>Some of the Glibc programs use the non-FHS compliant
59 <filename class="directory">/var/db</filename> directory to store their
60 runtime data. Apply the following patch to make such programs store their
61 runtime data in the FHS-compliant locations:</para>
62
63<screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
64
65 <para>The Glibc documentation recommends building Glibc
66 in a dedicated build directory:</para>
67
68<screen><userinput remap="pre">mkdir -v build
69cd build</userinput></screen>
70
71 <para>Next, prepare Glibc for compilation:</para>
72
73<screen><userinput remap="configure">../configure \
74 --prefix=/usr \
75 --host=$LFS_TGT \
76 --build=$(../scripts/config.guess) \
77 --enable-kernel=&min-kernel; \
78 --with-headers=$LFS/usr/include \
79 libc_cv_slibdir=/lib</userinput></screen>
80<!--
81 libc_cv_forced_unwind=yes \
82 libc_cv_c_cleanup=yes</userinput></screen> -->
83
84 <variablelist>
85 <title>The meaning of the configure options:</title>
86
87 <varlistentry>
88 <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
89 <listitem>
90 <para>The combined effect of these switches is that Glibc's build system
91 configures itself to be cross-compiled, using the cross-linker and
92 cross-compiler in <filename class="directory">/tools</filename>.</para>
93 </listitem>
94 </varlistentry>
95
96 <varlistentry>
97 <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
98 <listitem>
99 <para>This tells Glibc to compile the library with support
100 for &min-kernel; and later Linux kernels. Workarounds for older
101 kernels are not enabled.</para>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry>
106 <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
107 <listitem>
108 <para>This tells Glibc to compile itself against the headers
109 recently installed to the $LFS/usr/include directory, so that
110 it knows exactly what features the kernel has and can optimize
111 itself accordingly.</para>
112 </listitem>
113 </varlistentry>
114
115 <varlistentry>
116 <term><parameter>libc_cv_slibdir=/lib</parameter></term>
117 <listitem>
118 <para>This ensures that the library is installed in /lib instead
119 of the default /lib64 on 64 bit machines.</para>
120 </listitem>
121 </varlistentry>
122
123 </variablelist>
124
125 <para>During this stage the following warning might appear:</para>
126
127 <blockquote>
128<screen><computeroutput>configure: WARNING:
129*** These auxiliary programs are missing or
130*** incompatible versions: msgfmt
131*** some features will be disabled.
132*** Check the INSTALL file for required versions.</computeroutput></screen>
133 </blockquote>
134
135 <para>The missing or incompatible <command>msgfmt</command> program is
136 generally harmless. This <command>msgfmt</command> program is part of the
137 Gettext package which the host distribution should provide.</para>
138
139 <note><para>There have been reports that this package may fail when
140 building as a "parallel make". If this occurs, rerun the make command
141 with a "-j1" option.</para></note>
142
143 <para>Compile the package:</para>
144
145<screen><userinput remap="make">make</userinput></screen>
146
147 <para>Install the package:</para>
148
149 <warning><para>If <envar>LFS</envar> is not properly set, and despite the
150 recommendations, you are building as root, the next command will install
151 the newly built glibc to your host system, which most likely will render it
152 unusable. So double check that the environment is correctly set for user
153 <systemitem class="username">lfs</systemitem>.</para></warning>
154
155<screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
156
157 <variablelist>
158 <title>The meaning of the <command>make install</command> option:</title>
159
160 <varlistentry>
161 <term><parameter>DESTDIR=$LFS</parameter></term>
162 <listitem>
163 <para>The <envar>DESTDIR</envar> make variable is used by almost all
164 packages to define the location where the package should be
165 installed. If it is not set, it defaults to the root (<filename
166 class="directory">/</filename>) directory. Here we specify that
167 the package be installed in <filename class="directory">$LFS
168 </filename>, which will become the root after <xref linkend=
169 "ch-tools-chroot"/>.</para>
170 </listitem>
171 </varlistentry>
172
173 </variablelist>
174
175 <caution>
176 <para>At this point, it is imperative to stop and ensure that the basic
177 functions (compiling and linking) of the new toolchain are working as
178 expected. To perform a sanity check, run the following commands:</para>
179
180<screen><userinput>echo 'int main(){}' &gt; dummy.c
181$LFS_TGT-gcc dummy.c
182readelf -l a.out | grep '/ld-linux'</userinput></screen>
183
184 <para>If everything is working correctly, there should be no errors,
185 and the output of the last command will be of the form:</para>
186
187<screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
188
189 <para>Note that for 32-bit machines, the interpreter name will be
190 <filename>/lib/ld-linux.so.2</filename>.</para>
191
192 <para>If the output is not shown as above or there was no output at all,
193 then something is wrong. Investigate and retrace the steps to find out
194 where the problem is and correct it. This issue must be resolved before
195 continuing on.</para>
196
197 <para>Once all is well, clean up the test files:</para>
198
199<screen><userinput>rm -v dummy.c a.out</userinput></screen>
200
201 </caution>
202
203 <note><para>Building packages in the next chapter will serve as an
204 additional check that the toolchain has been built properly. If some
205 package, especially binutils-pass2 or gcc-pass2, fails to build, it is
206 an indication that something has gone wrong with the
207 previous Binutils, GCC, or Glibc installations.</para></note>
208
209 <para>Now that our cross-toolchain is complete, finalize the installation
210 of the limits.h header. For doing so, run a utility provided by the GCC
211 developers:</para>
212
213<screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
214
215 </sect2>
216
217 <sect2 role="content">
218 <title/>
219
220 <para>Details on this package are located in
221 <xref linkend="contents-glibc" role="."/></para>
222
223 </sect2>
224
225</sect1>
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