[Bug preprocessor/40376] GCC defines UNICODE instead of _UNICODE for -municode

["ktietz at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #5 from ktietz at gcc dot gnu dot org  2009-06-09 06:52 -------
(In reply to comment #4)
> Subject: Re:  GCC defines UNICODE instead of _UNICODE
>  for -municode
> 
> UNICODE is in the user's namespace; it should not be predefined if 
> flag_iso (if you have to use specs rather than hooks, you need 
> %{!ansi:%{!std=i*:%{!std=c*:-DUNICODE}}} to detect the various conformance 
> options).  We should not add to the instances of bug 545 that are still 
> present.  If the MinGW headers use a macro in the user's namespace as a 
> feature test macro of some sort, they are buggy and should be fixed (with 
> fixincludes if necessary for existing installations).
> 

It is right that _UNICODE and UNICODE are in user name space defined and are
controlling which API (wide/or ascii) has to be used.
UNICODE is used in windows headers itself (see msdn for documentation).
_UNICODE is used in CRT (and inspecial in tchar.h header) only. (This is also
documented in msdn).
I agree, that these two different macro names are a bit annoying, but for sure
they are platform specific stuff and are for sure absolutely unrelated to ISO.
Therefore to introduce a relationship to ISO defines is contradictive and
wrong. Those macros are controling behaviour of runtime. By the windows
specific switch -municode the windows runtime is controlled.

Cheers,
Kai


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40376