[Bug libstdc++/24012] New: [3.4,4.0,4,1 regression] #define _POSIX_C_SOURCE breaks #include <iostream>

["gerald at pfeifer dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The following simple program fails to compile on FreeBSD 5.4:  
  
  #define _POSIX_C_SOURCE 1   
  #include <iostream>   
  
g++ issues the following error message:   
  
  /gcc-current/bin/../lib/gcc/i386-unknown-freebsd5.4/4.1.0/../../../../incl  
ude/c++/4.1.0/cwchar:166:   
error: '::vfwscanf' has not been declared   
  /gcc-current/bin/../lib/gcc/i386-unknown-freebsd5.4/4.1.0/../../../../incl   
ude/c++/4.1.0/cwchar:170:   
error: '::vswscanf' has not been declared   
  /gcc-current/bin/../lib/gcc/i386-unknown-freebsd5.4/4.1.0/../../../../incl   
ude/c++/4.1.0/cwchar:174:   
error: '::vwscanf' has not been declared   
  /gcc-current/bin/../lib/gcc/i386-unknown-freebsd5.4/4.1.0/../../../../incl   
ude/c++/4.1.0/cwchar:191:   
error: '::wcstof' has not been declared   
   
The FreeBSD 5.4 system compiler, which basically is GCC 3.4.2, has the 
same issue.

-- 
           Summary: [3.4,4.0,4,1 regression] #define _POSIX_C_SOURCE breaks
                    #include <iostream>
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gerald at pfeifer dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i386-unknown-freebsd5.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24012