warn_pch_portability. NXP CodeWarrior Development Studio

Chapter 31 Pragmas for Diagnostic Messages

31.28 warn_pch_portability

Controls whether or not to issue a warning message when

#pragmaonceon

is used in a precompiled header.

Syntax

#pragma warn_pch_portability on | off | reset

Remarks

If you enable this pragma, the compiler issues a warning message when you use

#pragma once on

in a precompiled header. This helps you avoid situations in which transferring a precompiled header from machine to machine causes the precompiled header to produce different results. For more information, see pragma once

.

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

.

31.29 warn_possunwant

Controls the recognition of possible unintentional logical errors.

Syntax

#pragma warn_possunwant on | off | reset

Remarks

If you enable this pragma, the compiler checks for common, unintended logical errors:

• An assignment in either a logical expression or the conditional portion of an if

, while

, or for

expression. This warning message is useful if you use

=

when you mean to use

==

. The listing below shows an example.

Listing 31-18. Confusing = and == in Comparisons

if (a=b) f(); /* WARNING: a=b is an assignment. */ if ((a=b)!=0) f(); /* OK: (a=b)!=0 is a comparison. */ if (a==b) f(); /* OK: (a==b) is a comparison. */

CodeWarrior Development Studio for Power Architecture Processors Build Tools Reference Manual, Rev.

10.6, 02/2014

Freescale Semiconductor, Inc.

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