Checking Pragma Settings. NXP CodeWarrior Development Studio

Chapter 27

Using Pragmas

The #pragma preprocessor directive specifies option settings to the compiler to control the compiler and linker's code generation.

•

Checking Pragma Settings

•

Saving and Restoring Pragma Settings

•

Determining Which Settings Are Saved and Restored

•

Invalid Pragmas

•

Pragma Scope

27.1 Checking Pragma Settings

The preprocessor function

__option()

returns the state of pragma settings at compile-time.

The syntax is

__option(

setting-name ) where setting-name is the name of a pragma that accepts the on

, off

, and reset arguments.

If setting-name is on

,

__option(

setting-name

)

returns 1. If setting-name is off

,

__option(

setting-name

)

returns 0. If setting-name is not the name of a pragma,

__option(

setting-name

)

returns false. If setting-name is the name of a pragma that does not accept the on

, off

, and reset

arguments, the compiler issues a warning message.

Listing 27-1 on page 433

shows an example.

Listing 27-1. Using the __option() preprocessor function

#if __option(ANSI_strict)

#include "portable.h" /* Use the portable declarations. */

#else

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

10.2, 01/2016

Freescale Semiconductor, Inc.

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