Marcin 'Qrczak' Kowalczyk wrote on 2000-08-08 13:47 UTC:
> C99 recommends that a C implementation
> defines __STDC_ISO_10646__ if wchar_t is Unicode but gcc + glibc-2.1.3
> don't define it, so this detection is impractical.
No, it's not, because glibc-2.1.3 doesn't provide that functionality yet
(implementation of all the wchar_t functions and multibyte locales).
__STDC_ISO_10646__ An integer constant of the form yyyymmL
(for example, 199712L), intended to indicate that
values of type wchar_t are the coded
representations of the characters defined by
ISO/IEC 10646, along with all amendments and
technical corrigenda as of the specified year and
month.
So starting with glibc 2.2, you should find in __STDC_ISO_10646__ a
value > 200000L to indicate that Unicode 3.0 is now supported in
wchar_t. Sounds like a reasonably portable arrangement to me.
[Unfortunately, glibc 2.1.91 seems to have forgotten to define it
though. I hope Ulrich can fix this quickly, I just sent him a bug
report.]
Markus
--
Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
Email: mkuhn at acm.org, WWW: <http://www.cl.cam.ac.uk/~mgk25/>
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Linux-UTF8: i18n of Linux on all levels
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