<extension point="org.eclipse.cdt.debug.core.CDebugger">
   <debugger
      platform="*"
      name="OSE GDB Debugger"
      mode="run,core,attach"
      cpu="*"
      class="com.ose.fmd.cdt.cdi.gdb.processes.GDBDebugger"
      id="org.eclipse.cdt.debug.mi.core.CDebuggerNew"
   </debugger>
</extension>

public class GDBDebugger implements ICDIDebugger2
{
   public ICDISession createDebuggerSession(ILaunch launch, IBinaryObject exe,  IProgressMonitor monitor) throws CoreException
   {
     System.out.println("MyGDBDebugger: createDebuggerSession");
     return createSession(launch, exe.getPath().toFile(), monitor);
   }

   public ICDISession createSession(ILaunch launch, File executable, IProgressMonitor monitor) throws CoreException
   {
      System.out.println("My GDBDebugger: createSession");
      return null;
   }
}