source: chapter05/glibc.xml@ 47f42fa

7.8-systemd 7.9-systemd 7.9-systemd-rc1 7.9-systemd-rc2 systemd
Last change on this file since 47f42fa was 47f42fa, checked in by Krejzi <krejzi@…>, 7 years ago

Updated to GCC-5.1.0.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd@10901 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="../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<!-- The enable-obsolete-rpc should handle this just fine.
47 <para>In some cases, particularly LFS 7.1, the rpc headers were not
48 installed properly. Test to see if they are installed in the host system
49 and install if they are not:</para>
50
51<screen><userinput remap="pre">if [ ! -r /usr/include/rpc/types.h ]; then
52 su -c 'mkdir -pv /usr/include/rpc'
53 su -c 'cp -v sunrpc/rpc/*.h /usr/include/rpc'
54fi</userinput></screen>
55-->
56 <para>Fix a regression in the package that affects 32-bit architectures:</para>
57
58<screen><userinput remap="pre">sed -e '/ia32/s/^/1:/' \
59 -e '/SSE2/s/^1://' \
60 -i sysdeps/i386/i686/multiarch/mempcpy_chk.S</userinput></screen>
61
62 <para>The Glibc documentation recommends building Glibc outside of the source
63 directory in a dedicated build directory:</para>
64
65<screen><userinput remap="pre">mkdir -v ../glibc-build
66cd ../glibc-build</userinput></screen>
67<!--
68 <para>Because Glibc no longer supports i386, its developers say to use the
69 compiler flag <parameter>-march=i486</parameter> when building it for x86
70 machines. There are several ways to accomplish that, but testing shows that
71 the flag is best placed inside the build variable <quote>CFLAGS</quote>.
72 Instead of overriding completely what Glibc's internal build system uses
73 for CFLAGS, append the new flag to the existing contents of CFLAGS by
74 making use of the special file <filename>configparms</filename>. The
75 -mtune=native flag is also necessary to reset a reasonable value for -mtune
76 that is changed when setting -march.</para>
77
78<screen><userinput remap="configure">case `uname -m` in
79 i?86) echo "CFLAGS += -march=i486 -mtune=native" &gt; configparms ;;
80esac</userinput></screen>
81-->
82
83 <para>Next, prepare Glibc for compilation:</para>
84
85<screen><userinput remap="configure">../glibc-&glibc-version;/configure \
86 --prefix=/tools \
87 --host=$LFS_TGT \
88 --build=$(../glibc-&glibc-version;/scripts/config.guess) \
89 --disable-profile \
90 --enable-kernel=&min-kernel; \
91 --enable-obsolete-rpc \
92 --with-headers=/tools/include \
93 libc_cv_forced_unwind=yes \
94 libc_cv_ctors_header=yes \
95 libc_cv_c_cleanup=yes</userinput></screen>
96
97 <variablelist>
98 <title>The meaning of the configure options:</title>
99
100 <varlistentry>
101 <term><parameter>--host=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
102 <listitem>
103 <para>The combined effect of these switches is that Glibc's build system
104 configures itself to cross-compile, using the cross-linker and
105 cross-compiler in <filename class="directory">/tools</filename>.</para>
106 </listitem>
107 </varlistentry>
108
109 <varlistentry>
110 <term><parameter>--disable-profile</parameter></term>
111 <listitem>
112 <para>This builds the libraries without profiling information. Omit
113 this option if profiling on the temporary tools is necessary.</para>
114 </listitem>
115 </varlistentry>
116
117 <varlistentry>
118 <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
119 <listitem>
120 <para>This tells Glibc to compile the library with support
121 for &min-kernel; and later Linux kernels. Workarounds for older
122 kernels are not enabled.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>--enable-obsolete-rpc</parameter></term>
128 <listitem>
129 <para>This installs NIS and RPC related headers that are not
130 installed by default. They are required to build GCC and by
131 several BLFS packages.</para>
132 </listitem>
133 </varlistentry>
134
135 <varlistentry>
136 <term><parameter>--with-headers=/tools/include</parameter></term>
137 <listitem>
138 <para>This tells Glibc to compile itself against the headers recently
139 installed to the tools directory, so that it knows exactly what
140 features the kernel has and can optimize itself accordingly.</para>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry>
145 <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
146 <listitem>
147 <para>The linker installed during
148 <xref linkend="ch-tools-binutils-pass1"/> was cross-compiled and as
149 such cannot be used until Glibc has been installed. This means that
150 the configure test for force-unwind support will fail, as it relies on
151 a working linker. The libc_cv_forced_unwind=yes variable is passed in
152 order to inform <command>configure</command> that force-unwind
153 support is available without it having to run the test.</para>
154 </listitem>
155 </varlistentry>
156 <varlistentry>
157 <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
158 <listitem>
159 <para>Simlarly, we pass libc_cv_c_cleanup=yes through to the
160 <command>configure</command> script so that the test is skipped and C
161 cleanup handling support is configured.</para>
162 </listitem>
163 </varlistentry>
164 <varlistentry>
165 <term><parameter>libc_cv_ctors_header=yes</parameter></term>
166 <listitem>
167 <para>Simlarly, we pass libc_cv_ctors_header=yes through to the
168 <command>configure</command> script so that the test is skipped and
169 gcc constructor support is configured.</para>
170 </listitem>
171 </varlistentry>
172
173 </variablelist>
174
175 <para>During this stage the following warning might appear:</para>
176
177 <blockquote>
178<screen><computeroutput>configure: WARNING:
179*** These auxiliary programs are missing or
180*** incompatible versions: msgfmt
181*** some features will be disabled.
182*** Check the INSTALL file for required versions.</computeroutput></screen>
183 </blockquote>
184
185 <para>The missing or incompatible <command>msgfmt</command> program is
186 generally harmless. This <command>msgfmt</command> program is part of the
187 Gettext package which the host distribution should provide.</para>
188
189 <note><para>There have been reports that this package may fail when
190 building as a "parallel make". If this occurs, rerun the make command
191 with a "-j1" option.</para></note>
192
193 <para>Compile the package:</para>
194
195<screen><userinput remap="make">make</userinput></screen>
196
197<!--
198 <para>This package does come with a test suite, however, it cannot be
199 run at this time because we do not have a C++ compiler yet.</para>
200
201 <note>
202 <para>The test suite also requires locale data to be installed in order to run
203 successfully. Locale data provides information to the system regarding
204 such things as the date, time, and currency formats accepted and output by
205 system utilities. If the test suites are not being run in this chapter
206 (as per the recommendation), there is no need to install the locales now.
207 The appropriate locales will be installed in the next chapter. To install
208 the Glibc locales anyway, use instructions from <xref
209 linkend="ch-system-glibc" role="."/></para>
210 </note>
211-->
212 <para>Install the package:</para>
213
214<screen><userinput remap="install">make install</userinput></screen>
215
216 <caution>
217 <para>At this point, it is imperative to stop and ensure that the basic
218 functions (compiling and linking) of the new toolchain are working as
219 expected. To perform a sanity check, run the following commands:</para>
220
221<screen><userinput>echo 'main(){}' &gt; dummy.c
222$LFS_TGT-gcc dummy.c
223readelf -l a.out | grep ': /tools'</userinput></screen>
224
225 <para>If everything is working correctly, there should be no errors,
226 and the output of the last command will be of the form:</para>
227
228<screen><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux.so.2]</computeroutput></screen>
229
230 <para>Note that <filename class="directory">/tools/lib</filename>, or
231 <filename class="directory">/tools/lib64</filename> for 64-bit machines
232 appears as the prefix of the dynamic linker.</para>
233
234 <para>If the output is not shown as above or there was no output at all,
235 then something is wrong. Investigate and retrace the steps to find out
236 where the problem is and correct it. This issue must be resolved before
237 continuing on.</para>
238
239 <para>Once all is well, clean up the test files:</para>
240
241<screen><userinput>rm -v dummy.c a.out</userinput></screen>
242
243 </caution>
244
245 <note><para>Building Binutils in the section after next will serve as an
246 additional check that the toolchain has been built properly. If Binutils
247 fails to build, it is an indication that something has gone wrong with the
248 previous Binutils, GCC, or Glibc installations.</para></note>
249
250 </sect2>
251
252 <sect2 role="content">
253 <title/>
254
255 <para>Details on this package are located in
256 <xref linkend="contents-glibc" role="."/></para>
257
258 </sect2>
259
260</sect1>
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