AN3350 datasheet(151/185 Pages) STMICROELECTRONICS

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AN3350

Pragmas for diagnostic messages

Doc ID 018512 Rev 2

151/185

19.26

warn_no_side_effect

Controls the issuing of warning messages for redundant statements.

Syntax

#pragma warn_no_side_effect on | off | reset

Remarks

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

statement that produces no side effect. To suppress this warning message, cast the

statement with (void).Example 99 provides an example.

Example 99 Example of Pragma warn_no_side_effect

#pragma warn_no_side_effect on

void func(int a,int b)

{

a+b; /* WARNING: expression has no side effect */

(void)(a+b); /* OK: void cast suppresses warning. */

}

By default, this pragma is off.

19.27

warn_padding

Controls the issuing of warning messages for data structure padding.

Syntax

#pragma warn_padding on | off | reset

Remarks

If you enable this pragma, the compiler warns about any bytes that were implicitly added

after an ANSI C struct member to improve memory alignment. Refer to the appropriate

Targeting manual for more information on how the compiler pads data structures for a

particular processor or operating system.

By default, this setting is off.

19.28

warn_pch_portability

Controls whether or not to issue a warning message when #pragma once on 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

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