warn_unusedarg

Controls the recognition of unreferenced arguments.

  #pragma warn_unusedarg on | off | reset  

If you enable this pragma, the compiler issues a warning message when it encounters an argument you declare but do not use.

This check helps you find arguments that you either misspelled or did not use in your program. The following listing shows an example.

void func(int temp, int error); 
{

  error = do_something(); /* WARNING: temp is unused. */

}  

To prevent this warning, you can declare an argument in a few ways:

• Use the pragma unused, as in the following listing.
  Listing: Using pragma unused() to prevent unused argument messages

  void func(int temp, int error)
  {
  
    #pragma unused (temp)
  
    /* Compiler does not warn that temp is not used. */
  
    error=do_something();
  
  }
  

• Do not give the unused argument a name. The following listing shows an example.

  The compiler allows this feature in C++ source code. To allow this feature in C source code, disable ANSI strict checking.

  Listing: Unused, Unnamed Arguments

  void func(int /* temp */, int error)
  {
  
    /* Compiler does not warn that "temp" is not used. */
  
    error=do_something();
  
  }