Re: vector of pimpl's / weird behavior

hi,

the code below generates the following behavior. cld someone please
help understand it?
1) clean project + build project generates build errors (see bottom)

2) build a second time, errors disappears, run: ok

3) uncomment [1] and comment [2], no problem

4) uncomment [3] and [4], also no problem

#ifndef A_IMPL_H_
#define A_IMPL_H_
#include <memory>
class A_impl{
        public:
                A_impl();
                virtual ~A_impl(){};
                virtual std::auto_ptr<A_impl> clone()const=0;
        private:
                A_impl& operator=(const A_impl&);};

#endif /*A_IMPL_H_*/

#ifndef A_H_
#define A_H_
#include <memory>
//#include "A_impl.h" // [1]
class A_impl;//[2]
class A{
        public:
                A(const A_impl& impl_);
                A(const A& o);
                A& operator=(const A& rhs);
        private:
                A();
                std::auto_ptr<A_impl> pimpl;};

#endif /*A_H_*/

#ifndef AS_H_
#define AS_H_
#include <vector>
#include "A.h"
class As{
        public:
                As(
                        const std::vector<A>& sub_collec_
                );
        private:
                std::vector<A> sub_collec;//[3]};

#endif /*AS_H_*/
#include "A.h"
#include "A_impl.h"
A::A(const A_impl& impl_):pimpl(impl_.clone()){};
A::A(const A& o):pimpl((o.pimpl)->clone()){};
A& A::operator=(const A& rhs){
        if(&rhs!=this){
                pimpl=rhs.pimpl->clone();
        };
        return *this;};

#include "As.h"
As::As(
        const std::vector<A>& sub_collec_
): sub_collec(sub_collec_){};//[4]

instantiated from 'void std::_Destroy(_Tp*) [with _Tp = A]'
testing_vector_pimpl A.h line 6 1191008360119 128231
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
stl_construct.h instantiated from 'void
std::__destroy_aux(_ForwardIterator, _ForwardIterator, __false_type)
[with _ForwardIterator = A*]' testing_vector_pimpl line 122
1191008360120 128232
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
stl_construct.h instantiated from 'void
std::_Destroy(_ForwardIterator, _ForwardIterator, std::allocator<_T2>)
[with _ForwardIterator = A*, _Tp = A]' testing_vector_pimpl line 182
1191008360120 128234
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
stl_construct.h instantiated from 'void
std::_Destroy(_ForwardIterator, _ForwardIterator) [with
_ForwardIterator = A*]' testing_vector_pimpl line 155 1191008360120
128233
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
stl_vector.h instantiated from 'std::vector<_Tp, _Alloc>::~vector()
[with _Tp = A, _Alloc = std::allocator<A>]' testing_vector_pimpl line
272 1191008360120 128235