AN3350 datasheet(155/185 Pages) STMICROELECTRONICS

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AN3350

Pragmas for diagnostic messages

Doc ID 018512 Rev 2

155/185

To prevent this warning, you can declare an argument in a few ways:

●

Use the pragma unused, as in Example 108.

Example 108 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.Example 109 shows an example.

The compiler allows this feature in C++ source code. To allow this feature in C source code,

disable ANSI strict checking.

Example 109 Unused, unnamed arguments

void func(int /* temp */, int error)

{

/* Compiler does not warn that "temp" is not used. */

error=do_something();

}

By default, this pragma is off.

19.35

warn_unusedvar

Controls the recognition of unreferenced variables.

Syntax

#pragma warn_unusedvar on | off | reset

Remarks

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

variable you declare but do not use.

This check helps you find variables that you either misspelled or did not use in your

program.Example 110 shows an example.

Example 110 Unused local variables example

int error;

void func(void)

{

int temp, errer; /* NOTE: errer is misspelled. */

error = do_something(); /* WARNING: temp and errer are unused. */

}

If you want to use this warning but need to declare a variable that you do not use, include

the pragma unused, as in Example 111.

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