g++ & _XOPEN_SOURCE

[Kevin Dorne]

I have been working on getting lurker (http://lurker.sourceforge.net) 
to compile on FreeBSD.  I managed to do it by removing all #define 
_XOPEN_SOURCE 500 from the source files, but the application's author 
suggested that such behaviour signified a major bug in libc/c++.

For example, compiling just this file

#define _XOPEN_SOURCE 500
#include <string>

Gave me this error:
In file included from /usr/include/c++/3.4/bits/postypes.h:46,
                  from /usr/include/c++/3.4/iosfwd:50,
                  from /usr/include/c++/3.4/bits/stl_algobase.h:70,
                  from /usr/include/c++/3.4/bits/char_traits.h:46,
                  from /usr/include/c++/3.4/string:47,
                  from xx.cpp:2:
/usr/include/c++/3.4/cwchar:166: error: `::vfwscanf' has not been 
declared
/usr/include/c++/3.4/cwchar:170: error: `::vswscanf' has not been 
declared
/usr/include/c++/3.4/cwchar:174: error: `::vwscanf' has not been 
declared
/usr/include/c++/3.4/cwchar:191: error: `::wcstof' has not been declared

Is this a bug or a feature?

Cheers,
-k
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