Date: Mon, 04 Apr 2016 11:23:55 +0900 From: Daiki Ueno <ueno@....org> To: Masanori Ogino <masanori.ogino@...il.com> Cc: bug-gnu-gettext@....org, musl@...ts.openwall.com Subject: Re: [bug-gettext] AM_GNU_GETTEXT without referring internal symbols? Hello, Masanori Ogino <masanori.ogino@...il.com> writes: > Now AM_GNU_GETTEXT uses _nl_msg_cat_cntr and _nl_expand_alias to check > whether the implementation is compatible with GNU gettext. However, > the symbols don't appear in libintl.h so it seems that they are not > part of the public API. > > Actually, musl libc implements libintl features and the score of > gettext-tools' testsuite is equal to that with the internal libintl, > using a modified AM_GNU_GETTEXT. > > The musl's libintl.h even defines __USE_GNU_GETTEXT and > __GNU_GETTEXT_SUPPORTED_REVISION, but it does not imitate private > symbols. > > I had checked the archive and I've found some discussions: > https://lists.gnu.org/archive/html/bug-gnu-utils/2006-03/msg00011.html > http://lists.gnu.org/archive/html/bug-gettext/2015-11/msg00015.html > > So, if the goal of the macro is check if the implementation is > compatible with GNU gettext, why don't we check the public API rather > than using internal symbols? Is it possible to check if the > implementation is not one of known "broken" implementations and/or it > is really compatible? I agree that it would be desirable, but doubt that it is possible (at least reliably), because: - For some reason, there is no public API to directly load arbitrary MO files and we need to mimic the behavior of translated applications: prepare a directory structure (e.g. DIR/fr/domain.mo), call bindtextdomain() for the directory, and finally call gettext(). - That requires that at least one non-POSIX locale is available on the system, to pick the translation. However, even if the system is glibc based, not all locales might be available thanks to sub-packaging (Fedora) or user configuration (Debian). So I suppose the only feasible option here is to somehow whitelist the implementations by checking macros or symbols. Does musl provides anything like that? Regards, Footnotes:  https://sourceforge.net/p/predef/wiki/Libraries/ -- Daiki Ueno
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