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source: clfs-sysroot/BOOK/cross-tools/common/glibc.xml @ 7d57b83

Last change on this file since 7d57b83 was 7d57b83, checked in by Joe Ciccone <jciccone@…>, 15 years ago
Also add libc_cv_gnu89_inline=yes to the glibc config.cache.
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File size: 32.7 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-cross-tools-glibc" role="wrap">
9	<?dbhtml filename="glibc.html"?>
10
11	<title>Glibc-&glibc-version;</title>
12
13	<indexterm zone="ch-cross-tools-glibc">
14	<primary sortas="a-Glibc">Glibc</primary>
15	<secondary>cross tools</secondary>
16	</indexterm>
17
18	<sect2 role="package">
19	<title/>
20
21	<para>The Glibc package contains the main C library. This library provides
22	the basic routines for allocating memory, searching directories, opening and
23	closing files, reading and writing files, string handling, pattern matching,
24	arithmetic, and so on.</para>
25
26	</sect2>
27
28	<sect2 role="installation">
29	<title>Installation of Glibc</title>
30
31	<note os="a">
32	<para>Some packages outside of CLFS suggest installing GNU libiconv in
33	order to translate data from one encoding to another. The project's
34	home page (<ulink url="http://www.gnu.org/software/libiconv/"/>) says
35	<quote>This library provides an <function>iconv()</function>
36	implementation, for use on systems which don't have one, or whose
37	implementation cannot convert from/to Unicode.</quote> Glibc provides
38	an <function>iconv()</function> implementation and can convert from/to
39	Unicode, therefore libiconv is not required on an CLFS system.</para>
40	</note>
41
42	<para os="p1">The Glibc build will expect to find
43	<filename>libgcc_eh</filename>, but this library is not installed when GCC
44	is built without "--enable-shared". As a result, the Glibc build will fail.
45	The following patch will force Glibc to check for the existance of
46	<filename>libgcc_eh</filename> and try to link to it only if it exists:</para>
47
48	<screen os="p2"><userinput>patch -Np1 -i ../&glibc-libgcc_eh-patch;</userinput></screen>
49
50	<para os="p3">The following patch fixes an issue that can
51	cause <command>localdef</command> to segfault:</para>
52
53	<screen os="p4"><userinput>patch -Np1 -i ../&glibc-localedef_segfault-patch;</userinput></screen>
54
55	<para os="p5">The following patch builds <filename>zic-native</filename>,
56	<filename>localedef-native</filename>, and
57	<filename>rpcgen-native</filename>. <filename>zic-native</filename> is used
58	to generate the zoneinfo, <filename>localedef-native</filename> is used to
59	generate the locale archive, and <filename>rpcgen-native</filename> is used
60	to generate part of <filename>librpcsvc.a</filename>. All of these programs
61	would normally not be available when cross-compiling:</para>
62
63	<screen os="p6"><userinput>patch -Np1 -i ../&glibc-cross_hacks-patch;</userinput></screen>
64
65	<para os="b">The Glibc documentation recommends building Glibc outside of the
66	source directory in a dedicated build directory:</para>
67
68	<screen os="c"><userinput>mkdir -v ../glibc-build
69	cd ../glibc-build</userinput></screen>
70
71	<para os="d">The following lines need to be added to
72	<filename>config.cache</filename> for Glibc to support NPTL:</para>
73
74	<screen os="e"><userinput>echo "libc_cv_forced_unwind=yes" > config.cache
75	echo "libc_cv_c_cleanup=yes" >> config.cache
76	echo "libc_cv_gnu89_inline=yes" >> config.cache</userinput></screen>
77
78	<para os="f">The following line needs to be added to
79	<filename>configparms</filename> to adjust installation paths:</para>
80
81	<screen os="g"><userinput>echo "install_root=${CLFS}" > configparms</userinput></screen>
82
83	<para os="h">Prepare Glibc for compilation:</para>
84
85	<screen os="i"><userinput>BUILD_CC="gcc" CC="${CLFS_TARGET}-gcc" \
86	AR="${CLFS_TARGET}-ar" RANLIB="${CLFS_TARGET}-ranlib" \
87	../glibc-&glibc-version;/configure --prefix=/usr \
88	--libexecdir=/usr/lib/glibc --host=${CLFS_TARGET} --build=${CLFS_HOST} \
89	--disable-profile --enable-add-ons --with-tls --enable-kernel=2.6.0 \
90	--with-__thread --with-binutils=${CLFS}/cross-tools/bin \
91	--with-headers=${CLFS}/usr/include --cache-file=config.cache</userinput></screen>
92
93	<variablelist os="j">
94	<title>The meaning of the new configure options:</title>
95
96	<varlistentry os="j1">
97	<term><parameter>BUILD_CC="gcc"</parameter></term>
98	<listitem>
99	<para>This tells Glibc to use the compiler on the host system. This is
100	used to create the tools Glibc uses during its build.</para>
101	</listitem>
102	</varlistentry>
103
104	<varlistentry os="j2">
105	<term><parameter>CC="${CLFS_TARGET}-gcc"</parameter></term>
106	<listitem>
107	<para>This forces Glibc to use the GCC compiler that we made for our target
108	architecture.</para>
109	</listitem>
110	</varlistentry>
111
112	<varlistentry os="j3">
113	<term><parameter>AR="${CLFS_TARGET}-ar"</parameter></term>
114	<listitem>
115	<para>This forces Glibc to use the <command>ar</command> utility
116	we made for our target architecture.</para>
117	</listitem>
118	</varlistentry>
119
120	<varlistentry os="j4">
121	<term><parameter>RANLIB="${CLFS_TARGET}-ranlib"</parameter></term>
122	<listitem>
123	<para>This forces Glibc to use the <command>ranlib</command> utility
124	we made for our target architecture.</para>
125	</listitem>
126	</varlistentry>
127
128	<varlistentry os="j5">
129	<term><parameter>--disable-profile</parameter></term>
130	<listitem>
131	<para>This builds the libraries without profiling information.
132	Omit this option if profiling on the temporary tools is necessary.</para>
133	</listitem>
134	</varlistentry>
135
136	<varlistentry os="j6">
137	<term><parameter>--enable-add-ons</parameter></term>
138	<listitem>
139	<para>This tells Glibc to utilize all add-ons that are
140	available.</para>
141	</listitem>
142	</varlistentry>
143
144	<varlistentry os="j7">
145	<term><parameter>--with-tls</parameter></term>
146	<listitem>
147	<para>This tells Glibc to use Thread Local Storage.</para>
148	</listitem>
149	</varlistentry>
150
151	<varlistentry os="j8">
152	<term><parameter>--with-__thread</parameter></term>
153	<listitem>
154	<para>This tells Glibc to use use the __thread for libc and
155	libpthread builds.</para>
156	</listitem>
157	</varlistentry>
158
159	<varlistentry os="j9">
160	<term><parameter>--with-binutils=${CLFS}/cross-tools/bin</parameter></term>
161	<listitem>
162	<para>This tells Glibc to use the Binutils that are specific to
163	our target architecture.</para>
164	</listitem>
165	</varlistentry>
166
167	<varlistentry os="j10">
168	<term><parameter>--cache-file=config.cache</parameter></term>
169	<listitem>
170	<para>This tells Glibc to utilize a premade cache file.</para>
171	</listitem>
172	</varlistentry>
173
174	</variablelist>
175
176	<para os="k">During this stage the following warning might appear:</para>
177
178	<blockquote os="l"><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></blockquote>
183
184	<para os="m">The missing or incompatible <command>msgfmt</command> program is
185	generally harmless. This <command>msgfmt</command> program is part of the
186	Gettext package which the host distribution should provide.</para>
187
188	<para os="n">Compile the package:</para>
189
190	<screen os="o"><userinput>make</userinput></screen>
191
192	<para os="p">Install the package:</para>
193
194	<screen os="q"><userinput>make install</userinput></screen>
195
196	</sect2>
197
198	<sect2 id="i18n-glibc" role="configuration">
199	<title>Internationalization</title>
200
201	<para>The locales that can make the system respond in a different
202	language were not installed by the above command. Install them
203	with:</para>
204
205	<screen><userinput>make localedata/install-locales</userinput></screen>
206
207	<para>To save time, an alternative to running the previous command (which
208	generates and installs every locale listed in the
209	glibc-&glibc-version;/localedata/SUPPORTED file) is to install only
210	those locales that are wanted and needed. This can be achieved by using
211	the <command>localedef</command> command. Information on this command is
212	located in the <filename>INSTALL</filename> file in the Glibc source.
213	However, there are a number of locales that are essential in order for the
214	tests of future packages to pass, in particular, the
215	<emphasis>libstdc++</emphasis> tests from GCC. The following instructions,
216	instead of the <parameter>install-locales</parameter> target used above,
217	will install the minimum set of locales necessary for the tests to run
218	successfully:</para>
219
220	<screen role="nodump"><userinput>mkdir -pv ${CLFS}/usr/lib/locale
221	export I18NPATH=${PWD}/localedata
222	export GCONV_PATH=${PWD}/iconvdata
223	export LOCALEDEF="${PWD}/locale/localedef-native
224	--alias-file=../intl/locale.alias"
225	cd ../glibc-&glibc-version;/localedata
226	${LOCALEDEF} -i locales/de_DE -f charmaps/ISO-8859-1 --prefix=${CLFS} de_DE
227	${LOCALEDEF} -i locales/de_DE@euro -f charmaps/ISO-8859-15 \
228	--prefix=${CLFS} de_DE@euro
229	${LOCALEDEF} -i locales/en_HK -f charmaps/ISO-8859-1 --prefix=${CLFS} en_HK
230	${LOCALEDEF} -i locales/en_PH -f charmaps/ISO-8859-1 --prefix=${CLFS} en_PH
231	${LOCALEDEF} -i locales/en_US -f charmaps/ISO-8859-1 --prefix=${CLFS} en_US
232	${LOCALEDEF} -i locales/es_MX -f charmaps/ISO-8859-1 --prefix=${CLFS} es_MX
233	${LOCALEDEF} -i locales/fa_IR -f charmaps/UTF-8 --prefix=${CLFS} fa_IR
234	${LOCALEDEF} -i locales/fr_FR -f charmaps/ISO-8859-1 --prefix=${CLFS} fr_FR
235	${LOCALEDEF} -i locales/fr_FR@euro -f charmaps/ISO-8859-15 \
236	--prefix=${CLFS} fr_FR@euro
237	${LOCALEDEF} -i locales/it_IT -f charmaps/ISO-8859-1 --prefix=${CLFS} it_IT
238	${LOCALEDEF} -i locales/ja_JP -f charmaps/EUC-JP --prefix=${CLFS} ja_JP
239	unset I18NPATH GCONV_PATH LOCALEDEF</userinput></screen>
240
241	<para>Some locales installed by the <command>make
242	localedata/install-locales</command> command above are not properly
243	supported by some applications that are in the CLFS and BLFS books. Because
244	of the various problems that arise due to application programmers making
245	assumptions that break in such locales, CLFS should not be used in locales
246	that utilize multibyte character sets (including UTF-8) or right-to-left
247	writing order. Numerous unofficial and unstable patches are required to
248	fix these problems, and it has been decided by the CLFS developers not to
249	support such complex locales at this time. This applies to the ja_JP and
250	fa_IR locales as well—they have been installed only for GCC and
251	Gettext tests to pass, and the <command>watch</command> program (part of
252	the Procps package) does not work properly in them. Various attempts to
253	circumvent these restrictions are documented in internationalization-related
254	hints.</para>
255
256	</sect2>
257
258	<sect2 id="conf-glibc" role="configuration">
259	<title>Configuring Glibc</title>
260
261	<indexterm zone="conf-glibc">
262	<primary sortas="e-/etc/nsswitch.conf">/etc/nsswitch.conf</primary>
263	</indexterm>
264
265	<indexterm zone="conf-glibc">
266	<primary sortas="e-/etc/localtime">/etc/localtime</primary>
267	</indexterm>
268
269	<para>The <filename>/etc/nsswitch.conf</filename> file needs to be created
270	because, although Glibc provides defaults when this file is missing or
271	corrupt, the Glibc defaults do not work well in a networked environment.
272	The time zone also needs to be configured.</para>
273
274	<para>Create a new file <filename>/etc/nsswitch.conf</filename> by running
275	the following:</para>
276
277	<screen><userinput>cat > ${CLFS}/etc/nsswitch.conf << "EOF"
278	<literal># Begin /etc/nsswitch.conf
279
280	passwd: files
281	group: files
282	shadow: files
283
284	hosts: files dns
285	networks: files
286
287	protocols: files
288	services: files
289	ethers: files
290	rpc: files
291
292	# End /etc/nsswitch.conf</literal>
293	EOF</userinput></screen>
294
295	<para>To determine the local time zone, run the following script:</para>
296
297	<screen role="nodump"><userinput>TZDIR="${CLFS}/usr/share/zoneinfo" ${CLFS}/usr/bin/tzselect</userinput></screen>
298
299	<para>After answering a few questions about the location, the script will
300	output the name of the time zone (e.g., <emphasis>EST5EDT</emphasis> or
301	<emphasis>Canada/Eastern</emphasis>). Then create the
302	<filename>/etc/localtime</filename> file by running:</para>
303
304	<screen><userinput>cp -v --remove-destination ${CLFS}/usr/share/zoneinfo/<replaceable>[xxx]</replaceable> \
305	${CLFS}/etc/localtime</userinput></screen>
306
307	<para>Replace <replaceable>[xxx]</replaceable> with the name of the time zone
308	that <command>tzselect</command> provided (e.g., Canada/Eastern).</para>
309
310	<variablelist>
311	<title>The meaning of the cp option:</title>
312
313	<varlistentry>
314	<term><parameter>--remove-destination</parameter></term>
315	<listitem>
316	<para>This is needed to force removal of the already existing symbolic
317	link. The reason for copying the file instead of using a symlink is to
318	cover the situation where <filename class="directory">/usr</filename>
319	is on a separate partition. This could be important when booted into
320	single user mode.</para>
321	</listitem>
322	</varlistentry>
323	</variablelist>
324
325	</sect2>
326
327	<sect2 id="conf-ld" role="configuration">
328	<title>Configuring The Dynamic Loader</title>
329
330	<indexterm zone="conf-ld">
331	<primary sortas="e-/etc/ld.so.conf">/etc/ld.so.conf</primary>
332	</indexterm>
333
334	<para>By default, the dynamic loader (<filename
335	class="libraryfile">/lib/ld-linux.so.2</filename>) searches through
336	<filename class="directory">/lib</filename> and <filename
337	class="directory">/usr/lib</filename> for dynamic libraries that are
338	needed by programs as they are run. However, if there are libraries in
339	directories other than <filename class="directory">/lib</filename> and
340	<filename class="directory">/usr/lib</filename>, these need to be
341	added to the <filename>/etc/ld.so.conf</filename> file in order
342	for the dynamic loader to find them. Two directories that are commonly
343	known to contain additional libraries are <filename
344	class="directory">/usr/local/lib</filename> and <filename
345	class="directory">/opt/lib</filename>, so add those directories to the
346	dynamic loader's search path.</para>
347
348	<para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
349	following:</para>
350
351	<screen><userinput>cat > ${CLFS}/etc/ld.so.conf << "EOF"
352	<literal># Begin /etc/ld.so.conf
353
354	/usr/local/lib
355	/opt/lib
356
357	# End /etc/ld.so.conf</literal>
358	EOF</userinput></screen>
359
360	</sect2>
361
362	<sect2 id="contents-glibc" role="content">
363	<title>Contents of Glibc</title>
364
365	<segmentedlist>
366	<segtitle>Installed programs</segtitle>
367	<segtitle>Installed libraries</segtitle>
368
369	<seglistitem>
370	<seg>catchsegv, gencat, getconf, getent, iconv, iconvconfig, ldconfig,
371	ldd, lddlibc4, locale, localedef, mtrace, nscd,
372	pcprofiledump, pt_chown, rpcgen, rpcinfo, sln, sprof, tzselect, xtrace,
373	zdump, and zic</seg>
374	<seg>ld.so, libBrokenLocale.[a,so], libSegFault.so, libanl.[a,so],
375	libbsd-compat.a, libc.[a,so], libcrypt.[a,so], libdl.[a,so], libg.a,
376	libieee.a, libm.[a,so], libmcheck.a, libmemusage.so, libnsl.a,
377	libnss_compat.so, libnss_dns.so, libnss_files.so, libnss_hesiod.so,
378	libnss_nis.so, libnss_nisplus.so, libpcprofile.so, libpthread.[a,so],
379	libresolv.[a,so], librpcsvc.a, librt.[a,so], libthread_db.so, and
380	libutil.[a,so]</seg>
381	</seglistitem>
382	</segmentedlist>
383
384	<variablelist>
385	<bridgehead renderas="sect3">Short Descriptions</bridgehead>
386	<?dbfo list-presentation="list"?>
387	<?dbhtml list-presentation="table"?>
388
389	<varlistentry id="catchsegv">
390	<term><command>catchsegv</command></term>
391	<listitem>
392	<para>Can be used to create a stack trace when a program
393	terminates with a segmentation fault</para>
394	<indexterm zone="ch-cross-tools-glibc catchsegv">
395	<primary sortas="b-catchsegv">catchsegv</primary>
396	</indexterm>
397	</listitem>
398	</varlistentry>
399
400	<varlistentry id="gencat">
401	<term><command>gencat</command></term>
402	<listitem>
403	<para>Generates message catalogues</para>
404	<indexterm zone="ch-cross-tools-glibc gencat">
405	<primary sortas="b-gencat">gencat</primary>
406	</indexterm>
407	</listitem>
408	</varlistentry>
409
410	<varlistentry id="getconf">
411	<term><command>getconf</command></term>
412	<listitem>
413	<para>Displays the system configuration values for file system specific
414	variables</para>
415	<indexterm zone="ch-cross-tools-glibc getconf">
416	<primary sortas="b-getconf">getconf</primary>
417	</indexterm>
418	</listitem>
419	</varlistentry>
420
421	<varlistentry id="getent">
422	<term><command>getent</command></term>
423	<listitem>
424	<para>Gets entries from an administrative database</para>
425	<indexterm zone="ch-cross-tools-glibc getent">
426	<primary sortas="b-getent">getent</primary>
427	</indexterm>
428	</listitem>
429	</varlistentry>
430
431	<varlistentry id="iconv">
432	<term><command>iconv</command></term>
433	<listitem>
434	<para>Performs character set conversion</para>
435	<indexterm zone="ch-cross-tools-glibc iconv">
436	<primary sortas="b-iconv">iconv</primary>
437	</indexterm>
438	</listitem>
439	</varlistentry>
440
441	<varlistentry id="iconvconfig">
442	<term><command>iconvconfig</command></term>
443	<listitem>
444	<para>Creates fastloading <command>iconv</command> module configuration
445	files</para>
446	<indexterm zone="ch-cross-tools-glibc iconvconfig">
447	<primary sortas="b-iconvconfig">iconvconfig</primary>
448	</indexterm>
449	</listitem>
450	</varlistentry>
451
452	<varlistentry id="ldconfig">
453	<term><command>ldconfig</command></term>
454	<listitem>
455	<para>Configures the dynamic linker runtime bindings</para>
456	<indexterm zone="ch-cross-tools-glibc ldconfig">
457	<primary sortas="b-ldconfig">ldconfig</primary>
458	</indexterm>
459	</listitem>
460	</varlistentry>
461
462	<varlistentry id="ldd">
463	<term><command>ldd</command></term>
464	<listitem>
465	<para>Reports which shared libraries are required
466	by each given program or shared library</para>
467	<indexterm zone="ch-cross-tools-glibc ldd">
468	<primary sortas="b-ldd">ldd</primary>
469	</indexterm>
470	</listitem>
471	</varlistentry>
472
473	<varlistentry id="lddlibc4">
474	<term><command>lddlibc4</command></term>
475	<listitem>
476	<para>Assists <command>ldd</command> with object files</para>
477	<indexterm zone="ch-cross-tools-glibc lddlibc4">
478	<primary sortas="b-lddlibc4">lddlibc4</primary>
479	</indexterm>
480	</listitem>
481	</varlistentry>
482
483	<varlistentry id="locale">
484	<term><command>locale</command></term>
485	<listitem>
486	<para>Tells the compiler to enable or disable the use of POSIX locales
487	for built-in operations</para>
488	<indexterm zone="ch-cross-tools-glibc locale">
489	<primary sortas="b-locale">locale</primary>
490	</indexterm>
491	</listitem>
492	</varlistentry>
493
494	<varlistentry id="localedef">
495	<term><command>localedef</command></term>
496	<listitem>
497	<para>Compiles locale specifications</para>
498	<indexterm zone="ch-cross-tools-glibc localedef">
499	<primary sortas="b-localedef">localedef</primary>
500	</indexterm>
501	</listitem>
502	</varlistentry>
503
504	<varlistentry id="mtrace">
505	<term><command>mtrace</command></term>
506	<listitem>
507	<para>Reads and interprets a memory trace file and
508	displays a summary in human-readable format</para>
509	<indexterm zone="ch-cross-tools-glibc mtrace">
510	<primary sortas="b-mtrace">mtrace</primary>
511	</indexterm>
512	</listitem>
513	</varlistentry>
514
515	<varlistentry id="nscd">
516	<term><command>nscd</command></term>
517	<listitem>
518	<para>A daemon that provides a cache for the most common name
519	service requests</para>
520	<indexterm zone="ch-cross-tools-glibc nscd">
521	<primary sortas="b-nscd">nscd</primary>
522	</indexterm>
523	</listitem>
524	</varlistentry>
525
526	<varlistentry id="pcprofiledump">
527	<term><command>pcprofiledump</command></term>
528	<listitem>
529	<para>Dumps information generated by PC profiling</para>
530	<indexterm zone="ch-cross-tools-glibc pcprofiledump">
531	<primary sortas="b-pcprofiledump">pcprofiledump</primary>
532	</indexterm>
533	</listitem>
534	</varlistentry>
535
536	<varlistentry id="pt_chown">
537	<term><command>pt_chown</command></term>
538	<listitem>
539	<para>A helper program for <command>grantpt</command> to set the owner,
540	group and access permissions of a slave pseudo terminal</para>
541	<indexterm zone="ch-cross-tools-glibc pt_chown">
542	<primary sortas="b-pt_chown">pt_chown</primary>
543	</indexterm>
544	</listitem>
545	</varlistentry>
546
547	<varlistentry id="rpcgen">
548	<term><command>rpcgen</command></term>
549	<listitem>
550	<para>Generates C code to implement the Remote Procecure Call (RPC)
551	protocol</para>
552	<indexterm zone="ch-cross-tools-glibc rpcgen">
553	<primary sortas="b-rpcgen">rpcgen</primary>
554	</indexterm>
555	</listitem>
556	</varlistentry>
557
558	<varlistentry id="rpcinfo">
559	<term><command>rpcinfo</command></term>
560	<listitem>
561	<para>Makes an RPC call to an RPC server</para>
562	<indexterm zone="ch-cross-tools-glibc rpcinfo">
563	<primary sortas="b-rpcinfo">rpcinfo</primary>
564	</indexterm>
565	</listitem>
566	</varlistentry>
567
568	<varlistentry id="sln">
569	<term><command>sln</command></term>
570	<listitem>
571	<para>A statically linked program that creates symbolic links</para>
572	<indexterm zone="ch-cross-tools-glibc sln">
573	<primary sortas="b-sln">sln</primary>
574	</indexterm>
575	</listitem>
576	</varlistentry>
577
578	<varlistentry id="sprof">
579	<term><command>sprof</command></term>
580	<listitem>
581	<para>Reads and displays shared object profiling data</para>
582	<indexterm zone="ch-cross-tools-glibc sprof">
583	<primary sortas="b-sprof">sprof</primary>
584	</indexterm>
585	</listitem>
586	</varlistentry>
587
588	<varlistentry id="tzselect">
589	<term><command>tzselect</command></term>
590	<listitem>
591	<para>Asks the user about the location of the
592	system and reports the corresponding time zone description</para>
593	<indexterm zone="ch-cross-tools-glibc tzselect">
594	<primary sortas="b-tzselect">tzselect</primary>
595	</indexterm>
596	</listitem>
597	</varlistentry>
598
599	<varlistentry id="xtrace">
600	<term><command>xtrace</command></term>
601	<listitem>
602	<para>Traces the execution of a program by
603	printing the currently executed function</para>
604	<indexterm zone="ch-cross-tools-glibc xtrace">
605	<primary sortas="b-xtrace">xtrace</primary>
606	</indexterm>
607	</listitem>
608	</varlistentry>
609
610	<varlistentry id="zdump">
611	<term><command>zdump</command></term>
612	<listitem>
613	<para>The time zone dumper</para>
614	<indexterm zone="ch-cross-tools-glibc zdump">
615	<primary sortas="b-zdump">zdump</primary>
616	</indexterm>
617	</listitem>
618	</varlistentry>
619
620	<varlistentry id="zic">
621	<term><command>zic</command></term>
622	<listitem>
623	<para>The time zone compiler</para>
624	<indexterm zone="ch-cross-tools-glibc zic">
625	<primary sortas="b-zic">zic</primary>
626	</indexterm>
627	</listitem>
628	</varlistentry>
629
630	<varlistentry id="ld.so">
631	<term><filename class="libraryfile">ld.so</filename></term>
632	<listitem>
633	<para>The helper program for shared library executables</para>
634	<indexterm zone="ch-cross-tools-glibc ld.so">
635	<primary sortas="c-ld.so">ld.so</primary>
636	</indexterm>
637	</listitem>
638	</varlistentry>
639
640	<varlistentry id="libBrokenLocale">
641	<term><filename class="libraryfile">libBrokenLocale</filename></term>
642	<listitem>
643	<para>Used by programs, such as Mozilla, to solve broken locales</para>
644	<indexterm zone="ch-cross-tools-glibc libBrokenLocale">
645	<primary sortas="c-libBrokenLocale">libBrokenLocale</primary>
646	</indexterm>
647	</listitem>
648	</varlistentry>
649
650	<varlistentry id="libSegFault">
651	<term><filename class="libraryfile">libSegFault</filename></term>
652	<listitem>
653	<para>The segmentation fault signal handler</para>
654	<indexterm zone="ch-cross-tools-glibc libSegFault">
655	<primary sortas="c-libSegFault">libSegFault</primary>
656	</indexterm>
657	</listitem>
658	</varlistentry>
659
660	<varlistentry id="libanl">
661	<term><filename class="libraryfile">libanl</filename></term>
662	<listitem>
663	<para>An asynchronous name lookup library</para>
664	<indexterm zone="ch-cross-tools-glibc libanl">
665	<primary sortas="c-libanl">libanl</primary>
666	</indexterm>
667	</listitem>
668	</varlistentry>
669
670	<varlistentry id="libbsd-compat">
671	<term><filename class="libraryfile">libbsd-compat</filename></term>
672	<listitem>
673	<para>Provides the portability needed
674	in order to run certain Berkey Software Distribution (BSD) programs
675	under Linux</para>
676	<indexterm zone="ch-cross-tools-glibc libbsd-compat">
677	<primary sortas="c-libbsd-compat">libbsd-compat</primary>
678	</indexterm>
679	</listitem>
680	</varlistentry>
681
682	<varlistentry id="libc">
683	<term><filename class="libraryfile">libc</filename></term>
684	<listitem>
685	<para>The main C library</para>
686	<indexterm zone="ch-cross-tools-glibc libc">
687	<primary sortas="c-libc">libc</primary>
688	</indexterm>
689	</listitem>
690	</varlistentry>
691
692	<varlistentry id="libcrypt">
693	<term><filename class="libraryfile">libcrypt</filename></term>
694	<listitem>
695	<para>The cryptography library</para>
696	<indexterm zone="ch-cross-tools-glibc libcrypt">
697	<primary sortas="c-libcrypt">libcrypt</primary>
698	</indexterm>
699	</listitem>
700	</varlistentry>
701
702	<varlistentry id="libdl">
703	<term><filename class="libraryfile">libdl</filename></term>
704	<listitem>
705	<para>The dynamic linking interface library</para>
706	<indexterm zone="ch-cross-tools-glibc libdl">
707	<primary sortas="c-libdl">libdl</primary>
708	</indexterm>
709	</listitem>
710	</varlistentry>
711
712	<varlistentry id="libg">
713	<term><filename class="libraryfile">libg</filename></term>
714	<listitem>
715	<para>A runtime library for <command>g++</command></para>
716	<indexterm zone="ch-cross-tools-glibc libg">
717	<primary sortas="c-libg">libg</primary>
718	</indexterm>
719	</listitem>
720	</varlistentry>
721
722	<varlistentry id="libieee">
723	<term><filename class="libraryfile">libieee</filename></term>
724	<listitem>
725	<para>The Institute of Electrical and Electronic Engineers (IEEE)
726	floating point library</para>
727	<indexterm zone="ch-cross-tools-glibc libieee">
728	<primary sortas="c-libieee">libieee</primary>
729	</indexterm>
730	</listitem>
731	</varlistentry>
732
733	<varlistentry id="libm">
734	<term><filename class="libraryfile">libm</filename></term>
735	<listitem>
736	<para>The mathematical library</para>
737	<indexterm zone="ch-cross-tools-glibc libm">
738	<primary sortas="c-libm">libm</primary>
739	</indexterm>
740	</listitem>
741	</varlistentry>
742
743	<varlistentry id="libmcheck">
744	<term><filename class="libraryfile">libmcheck</filename></term>
745	<listitem>
746	<para>Contains code run at boot</para>
747	<indexterm zone="ch-cross-tools-glibc libmcheck">
748	<primary sortas="c-libmcheck">libmcheck</primary>
749	</indexterm>
750	</listitem>
751	</varlistentry>
752
753	<varlistentry id="libmemusage">
754	<term><filename class="libraryfile">libmemusage</filename></term>
755	<listitem>
756	<para>Used by <command>memusage</command> (included in Glibc, but
757	not built in a base CLFS system as it has additional dependencies)
758	to help collect information about the memory usage of a program</para>
759	<indexterm zone="ch-cross-tools-glibc libmemusage">
760	<primary sortas="c-libmemusage">libmemusage</primary>
761	</indexterm>
762	</listitem>
763	</varlistentry>
764
765	<varlistentry id="libnsl">
766	<term><filename class="libraryfile">libnsl</filename></term>
767	<listitem>
768	<para>The network services library</para>
769	<indexterm zone="ch-cross-tools-glibc libnsl">
770	<primary sortas="c-libnsl">libnsl</primary>
771	</indexterm>
772	</listitem>
773	</varlistentry>
774
775	<varlistentry id="libnss">
776	<term><filename class="libraryfile">libnss</filename></term>
777	<listitem>
778	<para>The Name Service Switch libraries, containing functions for
779	resolving host names, user names, group names, aliases, services,
780	protocols, etc.</para>
781	<indexterm zone="ch-cross-tools-glibc libnss">
782	<primary sortas="c-libnss">libnss</primary>
783	</indexterm>
784	</listitem>
785	</varlistentry>
786
787	<varlistentry id="libpcprofile">
788	<term><filename class="libraryfile">libpcprofile</filename></term>
789	<listitem>
790	<para>Contains profiling functions used to track the amount of CPU
791	time spent in specific source code lines</para>
792	<indexterm zone="ch-cross-tools-glibc libpcprofile">
793	<primary sortas="c-libpcprofile">libpcprofile</primary>
794	</indexterm>
795	</listitem>
796	</varlistentry>
797
798	<varlistentry id="libpthread">
799	<term><filename class="libraryfile">libpthread</filename></term>
800	<listitem>
801	<para>The POSIX threads library</para>
802	<indexterm zone="ch-cross-tools-glibc libpthread">
803	<primary sortas="c-libpthread">libpthread</primary>
804	</indexterm>
805	</listitem>
806	</varlistentry>
807
808	<varlistentry id="libresolv">
809	<term><filename class="libraryfile">libresolv</filename></term>
810	<listitem>
811	<para>Contains functions for creating, sending, and interpreting
812	packets to the Internet domain name servers</para>
813	<indexterm zone="ch-cross-tools-glibc libresolv">
814	<primary sortas="c-libresolv">libresolv</primary>
815	</indexterm>
816	</listitem>
817	</varlistentry>
818
819	<varlistentry id="librpcsvc">
820	<term><filename class="libraryfile">librpcsvc</filename></term>
821	<listitem>
822	<para>Contains functions providing miscellaneous RPC services</para>
823	<indexterm zone="ch-cross-tools-glibc librpcsvc">
824	<primary sortas="c-librpcsvc">librpcsvc</primary>
825	</indexterm>
826	</listitem>
827	</varlistentry>
828
829	<varlistentry id="librt">
830	<term><filename class="libraryfile">librt</filename></term>
831	<listitem>
832	<para>Contains functions providing most of the interfaces specified by
833	the POSIX.1b Realtime Extension</para>
834	<indexterm zone="ch-cross-tools-glibc librt">
835	<primary sortas="c-librt">librt</primary>
836	</indexterm>
837	</listitem>
838	</varlistentry>
839
840	<varlistentry id="libthread_db">
841	<term><filename class="libraryfile">libthread_db</filename></term>
842	<listitem>
843	<para>Contains functions useful for
844	building debuggers for multi-threaded programs</para>
845	<indexterm zone="ch-cross-tools-glibc libthread_db">
846	<primary sortas="c-libthread_db">libthread_db</primary>
847	</indexterm>
848	</listitem>
849	</varlistentry>
850
851	<varlistentry id="libutil">
852	<term><filename class="libraryfile">libutil</filename></term>
853	<listitem>
854	<para>Contains code for <quote>standard</quote> functions used in
855	many different Unix utilities</para>
856	<indexterm zone="ch-cross-tools-glibc libutil">
857	<primary sortas="c-libutil">libutil</primary>
858	</indexterm>
859	</listitem>
860	</varlistentry>
861
862	</variablelist>
863
864	</sect2>
865
866	</sect1>

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