instantiate3.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// { dg-do compile }
// Origin: Scott Snyder <[e-mail]>

// PR c++/7639
// ICE when accessing member with incomplete type.

class ACE_Null_Mutex;	// { dg-error "forward declaration" }

template <class TYPE>
struct ACE_Cleanup_Adapter
{
  TYPE &object ()
  { return object_; }	// { dg-error "no member" }
  TYPE object_;		// { dg-error "incomplete type" }
};

template class ACE_Cleanup_Adapter<ACE_Null_Mutex>; // { dg-error "instantiated from here" }