Compile error std::pair . Is copy ctor call missed?

Question

#include <vector>
struct A {int a;};
struct B : public A {char b;};
int main()
  B b;
  typedef std::pair<A*, A*> MyPair;
  std::vector<MyPair> v;
  v.push_back(std::make_pair(&b, &b)); //compiler error here(pair<B*,B*>)
  return 0;
}error : formal argument x of type const std::pair<A*, A*> & in call to std::vector<std::pair<A*,A*> >::push_back(const std::pair<A*, A*> & ) is being passed std::pair<B*, B*>
There should not be any error because 1) std::pair<B*,B*> created 2) std::pair<A*,A*> from 1. copy-created.

Answer 1

The default libCstd is not fully conforming to the C++ standard. In particular, it is missing features that require class member templates. The issue is discussed in the C++ FAQ section on library compatibility:
[http://developers.sun.com/sunstudio/documentation/ss12u1/mr/READMEs/c++_faq.html#LibComp]
You can use the optional STLport library, which has this missing functionality, by adding the option -library=stlport4 to every CC command line, compiling and linking. You cannot mix libCstd and STLport in the same program. If you use STLport, everything must be compiled using STLport, including any libraries linked to your program.