[Bug c++/35884] New: defining __need_size_t before including causes error

[stdin at stdin dot me dot uk]

When you define __need_size_t before including <cstddef> it only pulls in
size_t, but the cstddef header expects ptrdiff_t there too and fails.
sample code:
--
#define __need_size_t
#include <cstddef>
main() {}
--
error message produced by g++:
$ g++ main.cpp
In file included from main.cpp:2:
/usr/include/c++/4.3/cstddef:55: error: ‘::ptrdiff_t’ has not been declared


-- 
           Summary: defining __need_size_t before including <cstddef> causes
                    error
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: stdin at stdin dot me dot uk
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35884