[Bug libstdc++/17532] New: _XOPEN_SOURCE macros break <string>

["papadopo at shfj dot cea dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

$ cat > foo.cc
#define _XOPEN_SOURCE 600
#define _XOPEN_SOURCE_EXTENDED 1
#include <string>
$ 
$ g++ foo.cc
[...]
/usr/local/gcc-3.4.2/lib/gcc/sparc-sun-solaris2.8/3.4.2/../../../../include/c++/3.4.2/cwchar:145:
error: `::btowc' has not been declared
/usr/local/gcc-3.4.2/lib/gcc/sparc-sun-solaris2.8/3.4.2/../../../../include/c++/3.4.2/cwchar:150:
error: `::fwide' has not been declared
[...]
$

-- 
           Summary: _XOPEN_SOURCE macros break <string>
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: papadopo at shfj dot cea dot fr
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2.8
  GCC host triplet: sparc-sun-solaris2.8
GCC target triplet: sparc-sun-solaris2.8


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17532