warn_undefmacro. NXP CodeWarrior Development Studio

warn_undefmacro

#pragma warn_resultnotused on | off | reset

Remarks

If you enable this pragma, the compiler issues a warning message when it encounters a statement that calls a function without using its result. To prevent this, cast the statement with

(void)

.

Listing 31-23 on page 498 provides an example.

Listing 31-23. Example of Function Calls with Unused Results

#pragma warn_resultnotused on extern int bar(); void func()

{

bar(); /* WARNING: result of function call is not used. */

void(bar()); /* OK: void cast suppresses warning. */

}

This pragma does not correspond to any panel setting. By default, this pragma is off.

31.32 warn_undefmacro

Controls the detection of undefined macros in

#if

and

#elif

directives.

Syntax

#pragma warn_undefmacro on | off | reset

Remarks

Listing 31-24 on page 498 provides an example.

Listing 31-24. Example of Undefined Macro

#if BADMACRO == 4 /* WARNING: undefined macro. */

Use this pragma to detect the use of undefined macros (especially expressions) where the default value 0 is used. To suppress this warning message, check if defined first.

NOTE

A warning message is only issued when a macro is evaluated. A short-circuited "

&&

" or "

||

" test or unevaluated "

?:

" will not produce a warning message.

By default, this pragma is off

.

CodeWarrior Development Studio for Advanced Packet Processing Build Tools Reference Manual, Rev.

10.2, 01/2016

498 Freescale Semiconductor, Inc.