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3<!-- This HTML file has been created by texi2html 1.54
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5
6<TITLE>GNU gettext utilities - Introduction</TITLE>
7<link href="gettext_2.html" rel=Next>
8<link href="gettext_toc.html" rel=ToC>
9
10</HEAD>
11<BODY>
12<p>Go to the first, previous, <A HREF="gettext_2.html">next</A>, <A HREF="gettext_12.html">last</A> section, <A HREF="gettext_toc.html">table of contents</A>.
13<P><HR><P>
14
15
16<H1><A NAME="SEC1" HREF="gettext_toc.html#TOC1">Introduction</A></H1>
17
18
19<BLOCKQUOTE>
20<P>
21This manual is still in <EM>DRAFT</EM> state. Some sections are still
22empty, or almost. We keep merging material from other sources
23(essentially e-mail folders) while the proper integration of this
24material is delayed.
25</BLOCKQUOTE>
26
27<P>
28In this manual, we use <EM>he</EM> when speaking of the programmer or
29maintainer, <EM>she</EM> when speaking of the translator, and <EM>they</EM>
30when speaking of the installers or end users of the translated program.
31This is only a convenience for clarifying the documentation. It is
32<EM>absolutely</EM> not meant to imply that some roles are more appropriate
33to males or females. Besides, as you might guess, GNU <CODE>gettext</CODE>
34is meant to be useful for people using computers, whatever their sex,
35race, religion or nationality!
36
37</P>
38<P>
39This chapter explains the goals sought in the creation
40of GNU <CODE>gettext</CODE> and the free Translation Project.
41Then, it explains a few broad concepts around
42Native Language Support, and positions message translation with regard
43to other aspects of national and cultural variance, as they apply to
44to programs. It also surveys those files used to convey the
45translations. It explains how the various tools interact in the
46initial generation of these files, and later, how the maintenance
47cycle should usually operate.
48
49</P>
50<P>
51Please send suggestions and corrections to:
52
53</P>
54
55<PRE>
56Internet address:
57 bug-gnu-utils@prep.ai.mit.edu
58</PRE>
59
60<P>
61Please include the manual's edition number and update date in your messages.
62
63</P>
64
65
66
67<H2><A NAME="SEC2" HREF="gettext_toc.html#TOC2">The Purpose of GNU <CODE>gettext</CODE></A></H2>
68
69<P>
70Usually, programs are written and documented in English, and use
71English at execution time to interact with users. This is true
72not only of GNU software, but also of a great deal of commercial
73and free software. Using a common language is quite handy for
74communication between developers, maintainers and users from all
75countries. On the other hand, most people are less comfortable with
76English than with their own native language, and would prefer to
77use their mother tongue for day to day's work, as far as possible.
78Many would simply <EM>love</EM> to see their computer screen showing
79a lot less of English, and far more of their own language.
80
81</P>
82<P>
83However, to many people, this dream might appear so far fetched that
84they may believe it is not even worth spending time thinking about
85it. They have no confidence at all that the dream might ever
86become true. Yet some have not lost hope, and have organized themselves.
87The Translation Project is a formalization of this hope into a
88workable structure, which has a good chance to get all of us nearer
89the achievement of a truly multi-lingual set of programs.
90
91</P>
92<P>
93GNU <CODE>gettext</CODE> is an important step for the Translation Project,
94as it is an asset on which we may build many other steps. This package
95offers to programmers, translators and even users, a well integrated
96set of tools and documentation. Specifically, the GNU <CODE>gettext</CODE>
97utilities are a set of tools that provides a framework within which
98other free packages may produce multi-lingual messages. These tools
99include a set of conventions about how programs should be written to
100support message catalogs, a directory and file naming organization for the
101message catalogs themselves, a runtime library supporting the retrieval of
102translated messages, and a few stand-alone programs to massage in various
103ways the sets of translatable strings, or already translated strings.
104A special mode for GNU Emacs also helps ease interested parties into
105preparing these sets, or bringing them up to date.
106
107</P>
108<P>
109GNU <CODE>gettext</CODE> is designed to minimize the impact of
110internationalization on program sources, keeping this impact as small
111and hardly noticeable as possible. Internationalization has better
112chances of succeeding if it is very light weighted, or at least,
113appear to be so, when looking at program sources.
114
115</P>
116<P>
117The Translation Project also uses the GNU <CODE>gettext</CODE>
118distribution as a vehicle for documenting its structure and methods.
119This goes beyond the strict technicalities of documenting the GNU <CODE>gettext</CODE>
120proper. By so doing, translators will find in a single place, as
121far as possible, all they need to know for properly doing their
122translating work. Also, this supplemental documentation might also
123help programmers, and even curious users, in understanding how GNU
124<CODE>gettext</CODE> is related to the remainder of the Translation
125Project, and consequently, have a glimpse at the <EM>big picture</EM>.
126
127</P>
128
129
130<H2><A NAME="SEC3" HREF="gettext_toc.html#TOC3">I18n, L10n, and Such</A></H2>
131
132<P>
133Two long words appear all the time when we discuss support of native
134language in programs, and these words have a precise meaning, worth
135being explained here, once and for all in this document. The words are
136<EM>internationalization</EM> and <EM>localization</EM>. Many people,
137tired of writing these long words over and over again, took the
138habit of writing <STRONG>i18n</STRONG> and <STRONG>l10n</STRONG> instead, quoting the first
139and last letter of each word, and replacing the run of intermediate
140letters by a number merely telling how many such letters there are.
141But in this manual, in the sake of clarity, we will patiently write
142the names in full, each time...
143
144</P>
145<P>
146By <STRONG>internationalization</STRONG>, one refers to the operation by which a
147program, or a set of programs turned into a package, is made aware of and
148able to support multiple languages. This is a generalization process,
149by which the programs are untied from calling only English strings or
150other English specific habits, and connected to generic ways of doing
151the same, instead. Program developers may use various techniques to
152internationalize their programs. Some of these have been standardized.
153GNU <CODE>gettext</CODE> offers one of these standards. See section <A HREF="gettext_8.html#SEC39">The Programmer's View</A>.
154
155</P>
156<P>
157By <STRONG>localization</STRONG>, one means the operation by which, in a set
158of programs already internationalized, one gives the program all
159needed information so that it can adapt itself to handle its input
160and output in a fashion which is correct for some native language and
161cultural habits. This is a particularisation process, by which generic
162methods already implemented in an internationalized program are used
163in specific ways. The programming environment puts several functions
164to the programmers disposal which allow this runtime configuration.
165The formal description of specific set of cultural habits for some
166country, together with all associated translations targeted to the
167same native language, is called the <STRONG>locale</STRONG> for this language
168or country. Users achieve localization of programs by setting proper
169values to special environment variables, prior to executing those
170programs, identifying which locale should be used.
171
172</P>
173<P>
174In fact, locale message support is only one component of the cultural
175data that makes up a particular locale. There are a whole host of
176routines and functions provided to aid programmers in developing
177internationalized software and which allow them to access the data
178stored in a particular locale. When someone presently refers to a
179particular locale, they are obviously referring to the data stored
180within that particular locale. Similarly, if a programmer is referring
181to "accessing the locale routines", they are referring to the
182complete suite of routines that access all of the locale's information.
183
184</P>
185<P>
186One uses the expression <STRONG>Native Language Support</STRONG>, or merely NLS,
187for speaking of the overall activity or feature encompassing both
188internationalization and localization, allowing for multi-lingual
189interactions in a program. In a nutshell, one could say that
190internationalization is the operation by which further localizations
191are made possible.
192
193</P>
194<P>
195Also, very roughly said, when it comes to multi-lingual messages,
196internationalization is usually taken care of by programmers, and
197localization is usually taken care of by translators.
198
199</P>
200
201
202<H2><A NAME="SEC4" HREF="gettext_toc.html#TOC4">Aspects in Native Language Support</A></H2>
203
204<P>
205For a totally multi-lingual distribution, there are many things to
206translate beyond output messages.
207
208</P>
209
210<UL>
211<LI>
212
213As of today, GNU <CODE>gettext</CODE> offers a complete toolset for
214translating messages output by C programs. Perl scripts and shell
215scripts will also need to be translated. Even if there are today some hooks
216by which this can be done, these hooks are not integrated as well as they
217should be.
218
219<LI>
220
221Some programs, like <CODE>autoconf</CODE> or <CODE>bison</CODE>, are able
222to produce other programs (or scripts). Even if the generating
223programs themselves are internationalized, the generated programs they
224produce may need internationalization on their own, and this indirect
225internationalization could be automated right from the generating
226program. In fact, quite usually, generating and generated programs
227could be internationalized independently, as the effort needed is
228fairly orthogonal.
229
230<LI>
231
232A few programs include textual tables which might need translation
233themselves, independently of the strings contained in the program
234itself. For example, RFC 1345 gives an English description for each
235character which GNU <CODE>recode</CODE> is able to reconstruct at execution.
236Since these descriptions are extracted from the RFC by mechanical means,
237translating them properly would require a prior translation of the RFC
238itself.
239
240<LI>
241
242Almost all programs accept options, which are often worded out so to
243be descriptive for the English readers; one might want to consider
244offering translated versions for program options as well.
245
246<LI>
247
248Many programs read, interpret, compile, or are somewhat driven by
249input files which are texts containing keywords, identifiers, or
250replies which are inherently translatable. For example, one may want
251<CODE>gcc</CODE> to allow diacriticized characters in identifiers or use
252translated keywords; <SAMP>`rm -i'</SAMP> might accept something else than
253<SAMP>`y'</SAMP> or <SAMP>`n'</SAMP> for replies, etc. Even if the program will
254eventually make most of its output in the foreign languages, one has
255to decide whether the input syntax, option values, etc., are to be
256localized or not.
257
258<LI>
259
260The manual accompanying a package, as well as all documentation files
261in the distribution, could surely be translated, too. Translating a
262manual, with the intent of later keeping up with updates, is a major
263undertaking in itself, generally.
264
265</UL>
266
267<P>
268As we already stressed, translation is only one aspect of locales.
269Other internationalization aspects are not currently handled by GNU
270<CODE>gettext</CODE>, but perhaps may be handled in future versions. There
271are many attributes that are needed to define a country's cultural
272conventions. These attributes include beside the country's native
273language, the formatting of the date and time, the representation of
274numbers, the symbols for currency, etc. These local <STRONG>rules</STRONG> are
275termed the country's locale. The locale represents the knowledge
276needed to support the country's native attributes.
277
278</P>
279<P>
280There are a few major areas which may vary between countries and
281hence, define what a locale must describe. The following list helps
282putting multi-lingual messages into the proper context of other tasks
283related to locales, and also presents some other areas which GNU
284<CODE>gettext</CODE> might eventually tackle, maybe, one of these days.
285
286</P>
287<DL COMPACT>
288
289<DT><EM>Characters and Codesets</EM>
290<DD>
291The codeset most commonly used through out the USA and most English
292speaking parts of the world is the ASCII codeset. However, there are
293many characters needed by various locales that are not found within
294this codeset. The 8-bit ISO 8859-1 code set has most of the special
295characters needed to handle the major European languages. However, in
296many cases, the ISO 8859-1 font is not adequate. Hence each locale
297will need to specify which codeset they need to use and will need
298to have the appropriate character handling routines to cope with
299the codeset.
300
301<DT><EM>Currency</EM>
302<DD>
303The symbols used vary from country to country as does the position
304used by the symbol. Software needs to be able to transparently
305display currency figures in the native mode for each locale.
306
307<DT><EM>Dates</EM>
308<DD>
309The format of date varies between locales. For example, Christmas day
310in 1994 is written as 12/25/94 in the USA and as 25/12/94 in Australia.
311Other countries might use ISO 8061 dates, etc.
312
313Time of the day may be noted as <VAR>hh</VAR>:<VAR>mm</VAR>, <VAR>hh</VAR>.<VAR>mm</VAR>,
314or otherwise. Some locales require time to be specified in 24-hour
315mode rather than as AM or PM. Further, the nature and yearly extent
316of the Daylight Saving correction vary widely between countries.
317
318<DT><EM>Numbers</EM>
319<DD>
320Numbers can be represented differently in different locales.
321For example, the following numbers are all written correctly for
322their respective locales:
323
324
325<PRE>
32612,345.67 English
32712.345,67 French
3281,2345.67 Asia
329</PRE>
330
331Some programs could go further and use different unit systems, like
332English units or Metric units, or even take into account variants
333about how numbers are spelled in full.
334
335<DT><EM>Messages</EM>
336<DD>
337The most obvious area is the language support within a locale. This is
338where GNU <CODE>gettext</CODE> provides the means for developers and users to
339easily change the language that the software uses to communicate to
340the user.
341
342</DL>
343
344<P>
345In the near future we see no chance that components of locale outside of
346message handling will be made available for use in other
347packages. The reason for this is that most modern systems provide
348a more or less reasonable support for at least some of the missing
349components. Another point is that the GNU <CODE>libc</CODE> and Linux will get
350a new and complete implementation of the whole locale functionality
351which could be adopted by system lacking a reasonable locale support.
352
353</P>
354
355
356<H2><A NAME="SEC5" HREF="gettext_toc.html#TOC5">Files Conveying Translations</A></H2>
357
358<P>
359The letters PO in <TT>`.po'</TT> files means Portable Object, to
360distinguish it from <TT>`.mo'</TT> files, where MO stands for Machine
361Object. This paradigm, as well as the PO file format, is inspired
362by the NLS standard developed by Uniforum, and implemented by Sun
363in their Solaris system.
364
365</P>
366<P>
367PO files are meant to be read and edited by humans, and associate each
368original, translatable string of a given package with its translation
369in a particular target language. A single PO file is dedicated to
370a single target language. If a package supports many languages,
371there is one such PO file per language supported, and each package
372has its own set of PO files. These PO files are best created by
373the <CODE>xgettext</CODE> program, and later updated or refreshed through
374the <CODE>msgmerge</CODE> program. Program <CODE>xgettext</CODE> extracts all
375marked messages from a set of C files and initializes a PO file with
376empty translations. Program <CODE>msgmerge</CODE> takes care of adjusting
377PO files between releases of the corresponding sources, commenting
378obsolete entries, initializing new ones, and updating all source
379line references. Files ending with <TT>`.pot'</TT> are kind of base
380translation files found in distributions, in PO file format, and
381<TT>`.pox'</TT> files are often temporary PO files.
382
383</P>
384<P>
385MO files are meant to be read by programs, and are binary in nature.
386A few systems already offer tools for creating and handling MO files
387as part of the Native Language Support coming with the system, but the
388format of these MO files is often different from system to system,
389and non-portable. They do not necessary use <TT>`.mo'</TT> for file
390extensions, but since system libraries are also used for accessing
391these files, it works as long as the system is self-consistent about
392it. If GNU <CODE>gettext</CODE> is able to interface with the tools already
393provided with systems, it will consequently let these provided tools
394take care of generating the MO files. Or else, if such tools are not
395found or do not seem usable, GNU <CODE>gettext</CODE> will use its own ways
396and its own format for MO files. Files ending with <TT>`.gmo'</TT> are
397really MO files, when it is known that these files use the GNU format.
398
399</P>
400
401
402<H2><A NAME="SEC6" HREF="gettext_toc.html#TOC6">Overview of GNU <CODE>gettext</CODE></A></H2>
403
404<P>
405The following diagram summarizes the relation between the files
406handled by GNU <CODE>gettext</CODE> and the tools acting on these files.
407It is followed by a somewhat detailed explanations, which you should
408read while keeping an eye on the diagram. Having a clear understanding
409of these interrelations would surely help programmers, translators
410and maintainers.
411
412</P>
413
414<PRE>
415Original C Sources ---&#62; PO mode ---&#62; Marked C Sources ---.
416 |
417 .---------&#60;--- GNU gettext Library |
418.--- make &#60;---+ |
419| `---------&#60;--------------------+-----------'
420| |
421| .-----&#60;--- PACKAGE.pot &#60;--- xgettext &#60;---' .---&#60;--- PO Compendium
422| | | ^
423| | `---. |
424| `---. +---&#62; PO mode ---.
425| +----&#62; msgmerge ------&#62; LANG.pox ---&#62;--------' |
426| .---' |
427| | |
428| `-------------&#60;---------------. |
429| +--- LANG.po &#60;--- New LANG.pox &#60;----'
430| .--- LANG.gmo &#60;--- msgfmt &#60;---'
431| |
432| `---&#62; install ---&#62; /.../LANG/PACKAGE.mo ---.
433| +---&#62; "Hello world!"
434`-------&#62; install ---&#62; /.../bin/PROGRAM -------'
435</PRE>
436
437<P>
438The indication <SAMP>`PO mode'</SAMP> appears in two places in this picture,
439and you may safely read it as merely meaning "hand editing", using
440any editor of your choice, really. However, for those of you being
441the lucky users of GNU Emacs, PO mode has been specifically created
442for providing a cozy environment for editing or modifying PO files.
443While editing a PO file, PO mode allows for the easy browsing of
444auxiliary and compendium PO files, as well as for following references into
445the set of C program sources from which PO files have been derived.
446It has a few special features, among which are the interactive marking
2edb0bde 447of program strings as translatable, and the validation of PO files
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448with easy repositioning to PO file lines showing errors.
449
450</P>
451<P>
452As a programmer, the first step to bringing GNU <CODE>gettext</CODE>
453into your package is identifying, right in the C sources, those strings
454which are meant to be translatable, and those which are untranslatable.
455This tedious job can be done a little more comfortably using emacs PO
456mode, but you can use any means familiar to you for modifying your
457C sources. Beside this some other simple, standard changes are needed to
458properly initialize the translation library. See section <A HREF="gettext_3.html#SEC13">Preparing Program Sources</A>, for
459more information about all this.
460
461</P>
462<P>
463For newly written software the strings of course can and should be
464marked while writing the it. The <CODE>gettext</CODE> approach makes this
465very easy. Simply put the following lines at the beginning of each file
466or in a central header file:
467
468</P>
469
470<PRE>
471#define _(String) (String)
472#define N_(String) (String)
473#define textdomain(Domain)
474#define bindtextdomain(Package, Directory)
475</PRE>
476
477<P>
478Doing this allows you to prepare the sources for internationalization.
479Later when you feel ready for the step to use the <CODE>gettext</CODE> library
480simply remove these definitions, include <TT>`libintl.h'</TT> and link
481against <TT>`libintl.a'</TT>. That is all you have to change.
482
483</P>
484<P>
485Once the C sources have been modified, the <CODE>xgettext</CODE> program
486is used to find and extract all translatable strings, and create an
487initial PO file out of all these. This <TT>`<VAR>package</VAR>.pot'</TT> file
488contains all original program strings. It has sets of pointers to
489exactly where in C sources each string is used. All translations
490are set to empty. The letter <KBD>t</KBD> in <TT>`.pot'</TT> marks this as
491a Template PO file, not yet oriented towards any particular language.
492See section <A HREF="gettext_4.html#SEC20">Invoking the <CODE>xgettext</CODE> Program</A>, for more details about how one calls the
493<CODE>xgettext</CODE> program. If you are <EM>really</EM> lazy, you might
494be interested at working a lot more right away, and preparing the
495whole distribution setup (see section <A HREF="gettext_10.html#SEC67">The Maintainer's View</A>). By doing so, you
496spare yourself typing the <CODE>xgettext</CODE> command, as <CODE>make</CODE>
497should now generate the proper things automatically for you!
498
499</P>
500<P>
501The first time through, there is no <TT>`<VAR>lang</VAR>.po'</TT> yet, so the
502<CODE>msgmerge</CODE> step may be skipped and replaced by a mere copy of
503<TT>`<VAR>package</VAR>.pot'</TT> to <TT>`<VAR>lang</VAR>.pox'</TT>, where <VAR>lang</VAR>
504represents the target language.
505
506</P>
507<P>
508Then comes the initial translation of messages. Translation in
509itself is a whole matter, still exclusively meant for humans,
510and whose complexity far overwhelms the level of this manual.
511Nevertheless, a few hints are given in some other chapter of this
512manual (see section <A HREF="gettext_9.html#SEC56">The Translator's View</A>). You will also find there indications
513about how to contact translating teams, or becoming part of them,
514for sharing your translating concerns with others who target the same
515native language.
516
517</P>
518<P>
519While adding the translated messages into the <TT>`<VAR>lang</VAR>.pox'</TT>
520PO file, if you do not have GNU Emacs handy, you are on your own
521for ensuring that your efforts fully respect the PO file format, and quoting
522conventions (see section <A HREF="gettext_2.html#SEC9">The Format of PO Files</A>). This is surely not an impossible task,
523as this is the way many people have handled PO files already for Uniforum or
524Solaris. On the other hand, by using PO mode in GNU Emacs, most details
525of PO file format are taken care of for you, but you have to acquire
526some familiarity with PO mode itself. Besides main PO mode commands
527(see section <A HREF="gettext_2.html#SEC10">Main PO mode Commands</A>), you should know how to move between entries
528(see section <A HREF="gettext_2.html#SEC11">Entry Positioning</A>), and how to handle untranslated entries
529(see section <A HREF="gettext_5.html#SEC27">Untranslated Entries</A>).
530
531</P>
532<P>
533If some common translations have already been saved into a compendium
534PO file, translators may use PO mode for initializing untranslated
535entries from the compendium, and also save selected translations into
536the compendium, updating it (see section <A HREF="gettext_4.html#SEC22">Using Translation Compendiums</A>). Compendium files
537are meant to be exchanged between members of a given translation team.
538
539</P>
540<P>
541Programs, or packages of programs, are dynamic in nature: users write
542bug reports and suggestion for improvements, maintainers react by
543modifying programs in various ways. The fact that a package has
544already been internationalized should not make maintainers shy
545of adding new strings, or modifying strings already translated.
546They just do their job the best they can. For the Translation
547Project to work smoothly, it is important that maintainers do not
548carry translation concerns on their already loaded shoulders, and that
549translators be kept as free as possible of programmatic concerns.
550
551</P>
552<P>
553The only concern maintainers should have is carefully marking new
554strings as translatable, when they should be, and do not otherwise
555worry about them being translated, as this will come in proper time.
556Consequently, when programs and their strings are adjusted in various
557ways by maintainers, and for matters usually unrelated to translation,
558<CODE>xgettext</CODE> would construct <TT>`<VAR>package</VAR>.pot'</TT> files which are
559evolving over time, so the translations carried by <TT>`<VAR>lang</VAR>.po'</TT>
560are slowly fading out of date.
561
562</P>
563<P>
564It is important for translators (and even maintainers) to understand
565that package translation is a continuous process in the lifetime of a
566package, and not something which is done once and for all at the start.
567After an initial burst of translation activity for a given package,
568interventions are needed once in a while, because here and there,
569translated entries become obsolete, and new untranslated entries
570appear, needing translation.
571
572</P>
573<P>
574The <CODE>msgmerge</CODE> program has the purpose of refreshing an already
575existing <TT>`<VAR>lang</VAR>.po'</TT> file, by comparing it with a newer
576<TT>`<VAR>package</VAR>.pot'</TT> template file, extracted by <CODE>xgettext</CODE>
577out of recent C sources. The refreshing operation adjusts all
578references to C source locations for strings, since these strings
579move as programs are modified. Also, <CODE>msgmerge</CODE> comments out as
580obsolete, in <TT>`<VAR>lang</VAR>.pox'</TT>, those already translated entries
581which are no longer used in the program sources (see section <A HREF="gettext_5.html#SEC28">Obsolete Entries</A>). It finally discovers new strings and inserts them in
582the resulting PO file as untranslated entries (see section <A HREF="gettext_5.html#SEC27">Untranslated Entries</A>). See section <A HREF="gettext_5.html#SEC24">Invoking the <CODE>msgmerge</CODE> Program</A>, for more information about what
583<CODE>msgmerge</CODE> really does.
584
585</P>
586<P>
587Whatever route or means taken, the goal is to obtain an updated
588<TT>`<VAR>lang</VAR>.pox'</TT> file offering translations for all strings.
589When this is properly achieved, this file <TT>`<VAR>lang</VAR>.pox'</TT> may
590take the place of the previous official <TT>`<VAR>lang</VAR>.po'</TT> file.
591
592</P>
593<P>
594The temporal mobility, or fluidity of PO files, is an integral part of
595the translation game, and should be well understood, and accepted.
596People resisting it will have a hard time participating in the
597Translation Project, or will give a hard time to other participants! In
598particular, maintainers should relax and include all available official
599PO files in their distributions, even if these have not recently been
600updated, without banging or otherwise trying to exert pressure on the
601translator teams to get the job done. The pressure should rather come
602from the community of users speaking a particular language, and
603maintainers should consider themselves fairly relieved of any concern
604about the adequacy of translation files. On the other hand, translators
605should reasonably try updating the PO files they are responsible for,
606while the package is undergoing pretest, prior to an official
607distribution.
608
609</P>
610<P>
611Once the PO file is complete and dependable, the <CODE>msgfmt</CODE> program
612is used for turning the PO file into a machine-oriented format, which
613may yield efficient retrieval of translations by the programs of the
614package, whenever needed at runtime (see section <A HREF="gettext_6.html#SEC34">The Format of GNU MO Files</A>). See section <A HREF="gettext_6.html#SEC33">Invoking the <CODE>msgfmt</CODE> Program</A>, for more information about all modalities of execution
615for the <CODE>msgfmt</CODE> program.
616
617</P>
618<P>
619Finally, the modified and marked C sources are compiled and linked
620with the GNU <CODE>gettext</CODE> library, usually through the operation of
621<CODE>make</CODE>, given a suitable <TT>`Makefile'</TT> exists for the project,
622and the resulting executable is installed somewhere users will find it.
623The MO files themselves should also be properly installed. Given the
624appropriate environment variables are set (see section <A HREF="gettext_7.html#SEC38">Magic for End Users</A>), the
625program should localize itself automatically, whenever it executes.
626
627</P>
628<P>
629The remainder of this manual has the purpose of explaining in depth the various
630steps outlined above.
631
632</P>
633<P><HR><P>
634<p>Go to the first, previous, <A HREF="gettext_2.html">next</A>, <A HREF="gettext_12.html">last</A> section, <A HREF="gettext_toc.html">table of contents</A>.
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