[Bug c++/11986] New: forward declaration error

["kemin dot zhou at ferring dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11986

           Summary: forward declaration error
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: critical
          Priority: P1
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kemin dot zhou at ferring dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux

when two classes have inter dependency, compiler could not compile.
The exact same code can be compiled with no problem with gcc3.2.2
After upgrading to gcc3.3.1, the same code would not compile:

the basic class lay out is like this:
class B;   // the forward declaration, stopped working in 3.3.1
class A {
  vector<B> bvec;
};
class B {
 public:
  void method(A& a);

   private:
      int someMembers;
};