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Document the internal _ and N_ macros
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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@ -37,17 +37,33 @@ extern char *__bind_textdomain_codeset (const char *__domainname,
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extern const char _libc_intl_domainname[];
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libc_hidden_proto (_libc_intl_domainname)
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/* Define the macros `_' and `N_' for conveniently marking translatable
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strings in the libc source code. We have to make sure we get the
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correct definitions so we undefine the macros first. */
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/* _ marks its argument, a string literal, for translation, and
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performs translation at run time if the LC_MESSAGES locale category
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has been set. The MSGID argument is extracted, added to the
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translation database, and eventually submitted to the translation
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team for processing. New translations are periodically
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incorporated into the glibc source tree as part of translation
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updates. */
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# undef _
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# define _(msgid) __dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
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/* N_ marks its argument, a string literal, for translation, so that
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it is extracted and added to the translation database (similar to
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the _ macro above). It does not translate the string at run time.
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The first, primary use case for N_ is a context in which a string
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literal is required, such as an initializer. Translation will
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happen later, for example using the __gettext function.
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The second, historic, use case involves strings which may be
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translated in a future version of the library, but cannot be
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translated in current releases due to some technical limitation
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(e.g., gettext not being available in the dynamic loader). No
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translation at run time happens in such cases. In the future, this
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historic usage of N_ may become deprecated. Strings which are not
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translated create unnecessary work for the translation team. We
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continue to use N_ because it helps mark translatable strings. */
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# undef N_
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# define N_(msgid) msgid
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# undef _
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/* This is defined as an optimizing macro, so use it. */
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# define _(msgid) \
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__dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
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# endif /* !_ISOMAC */
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#endif
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