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 listing below 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 shown in the listing below.
  Listing 2. 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 listing below 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 3. Unused, Unnamed Arguments

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

  error=do_something();
}

This pragma corresponds to the Unused Arguments setting in the C/C++ Warnings Panel . By default, this pragma is off .