source: chapter05/glibc.xml@ 12836f5

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Last change on this file since 12836f5 was 12836f5, checked in by Bruce Dubbs <bdubbs@…>, 6 years ago

Update to grub-2.02~beta3.
Update to glibc-2.24.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11100 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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File size: 6.9 KB
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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="../chapter06/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-ch5-sbu;</seg>
37 <seg>&glibc-ch5-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Glibc</title>
45
46 <para>The Glibc documentation recommends building Glibc
47 in a dedicated build directory:</para>
48
49<screen><userinput remap="pre">mkdir -v build
50cd build</userinput></screen>
51
52 <para>Next, prepare Glibc for compilation:</para>
53
54<screen><userinput remap="configure">../configure \
55 --prefix=/tools \
56 --host=$LFS_TGT \
57 --build=$(../scripts/config.guess) \
58 --enable-kernel=&min-kernel; \
59 --with-headers=/tools/include \
60 libc_cv_forced_unwind=yes \
61 libc_cv_ctors_header=yes \
62 libc_cv_c_cleanup=yes</userinput></screen>
63
64 <variablelist>
65 <title>The meaning of the configure options:</title>
66
67 <varlistentry>
68 <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
69 <listitem>
70 <para>The combined effect of these switches is that Glibc's build system
71 configures itself to cross-compile, using the cross-linker and
72 cross-compiler in <filename class="directory">/tools</filename>.</para>
73 </listitem>
74 </varlistentry>
75
76 <varlistentry>
77 <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
78 <listitem>
79 <para>This tells Glibc to compile the library with support
80 for &min-kernel; and later Linux kernels. Workarounds for older
81 kernels are not enabled.</para>
82 </listitem>
83 </varlistentry>
84
85 <varlistentry>
86 <term><parameter>--with-headers=/tools/include</parameter></term>
87 <listitem>
88 <para>This tells Glibc to compile itself against the headers recently
89 installed to the tools directory, so that it knows exactly what
90 features the kernel has and can optimize itself accordingly.</para>
91 </listitem>
92 </varlistentry>
93
94 <varlistentry>
95 <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
96 <listitem>
97 <para>The linker installed during
98 <xref linkend="ch-tools-binutils-pass1"/> was cross-compiled and as
99 such cannot be used until Glibc has been installed. This means that
100 the configure test for force-unwind support will fail, as it relies on
101 a working linker. The libc_cv_forced_unwind=yes variable is passed in
102 order to inform <command>configure</command> that force-unwind
103 support is available without it having to run the test.</para>
104 </listitem>
105 </varlistentry>
106 <varlistentry>
107 <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
108 <listitem>
109 <para>Similarly, we pass libc_cv_c_cleanup=yes through to the
110 <command>configure</command> script so that the test is skipped and C
111 cleanup handling support is configured.</para>
112 </listitem>
113 </varlistentry>
114 <varlistentry>
115 <term><parameter>libc_cv_ctors_header=yes</parameter></term>
116 <listitem>
117 <para>Similarly, we pass libc_cv_ctors_header=yes through to the
118 <command>configure</command> script so that the test is skipped and
119 gcc constructor support is configured.</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<screen><userinput remap="install">make install</userinput></screen>
150
151 <caution>
152 <para>At this point, it is imperative to stop and ensure that the basic
153 functions (compiling and linking) of the new toolchain are working as
154 expected. To perform a sanity check, run the following commands:</para>
155
156<screen><userinput>echo 'int main(){}' &gt; dummy.c
157$LFS_TGT-gcc dummy.c
158readelf -l a.out | grep ': /tools'</userinput></screen>
159
160 <para>If everything is working correctly, there should be no errors,
161 and the output of the last command will be of the form:</para>
162
163<screen><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux.so.2]</computeroutput></screen>
164
165 <para>Note that for 64-bit machines, the interpreter name will be
166 <filename>/tools/lib64/ld-linux-x86-64.so.2</filename>.</para>
167
168 <para>If the output is not shown as above or there was no output at all,
169 then something is wrong. Investigate and retrace the steps to find out
170 where the problem is and correct it. This issue must be resolved before
171 continuing on.</para>
172
173 <para>Once all is well, clean up the test files:</para>
174
175<screen><userinput>rm -v dummy.c a.out</userinput></screen>
176
177 </caution>
178
179 <note><para>Building Binutils in the section after next will serve as an
180 additional check that the toolchain has been built properly. If Binutils
181 fails to build, it is an indication that something has gone wrong with the
182 previous Binutils, GCC, or Glibc installations.</para></note>
183
184 </sect2>
185
186 <sect2 role="content">
187 <title/>
188
189 <para>Details on this package are located in
190 <xref linkend="contents-glibc" role="."/></para>
191
192 </sect2>
193
194</sect1>
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