warning: extra tokens at end of #endif directive

Question

I am compiling a quite a big project using VxWorks6.8 C++ compiler. I am getting following warning

warning: extra tokens at end of #endif directive

#ifndef _OM_NO_IOSTREAM
#ifdef WIN32
#ifndef USE_IOSTREAM
#define USE_IOSTREAM
#endif USE_IOSTREAM
#endif WIN32

I am getting a quite a lot of these warnings.

1. Why i am getting these warnings and from C++ standard point of view?
2. What is the good reason why compiler is warning for this?
3. What is the best way to fix this?

Thanks

Answer 1

should be:

#endif // USE_IOSTREAM
#endif // WIN32

endif doesn't take any arguments. Such comments are placed only for readability

EDIT:

and you miss closing #endif // _OM_NO_IOSTREAM at the end

Answer 2

Because you can't have anything after #endif

Also, you're missing an endif.

#ifndef _OM_NO_IOSTREAM
  #ifdef WIN32
    #ifndef USE_IOSTREAM
      #define USE_IOSTREAM
    #endif
  #endif
#endif