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Pragmas for diagnostic messages

AN3350

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Doc ID 018512 Rev 2

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

19.8

unused

Controls the suppression of warning messages for variables and parameters that are not

referenced in a function.

Syntax

#pragma unused ( var_name [, var_name ]... )

var_name

The name of a variable.

Remarks

This pragma suppresses the compile time warning messages for the unused variables and

parameters specified in its argument list. You can use this pragma only within a function

body. The listed variables must be within the scope of the function.

In C++, you cannot use this pragma with functions defined within a class definition or with

template functions.

Example 87 Example of pragma unused() in C

#pragma warn_unusedvar on

#pragma warn_unusedarg on

static void ff(int a)

{

int b;

#pragma unused(a,b)

/* Compiler does not warn that a and b are unused. */

}

Example 88 Example of Pragma unused() in C++

#pragma warn_unusedvar on

#pragma warn_unusedarg on

static void ff(int /* No warning */)

{

int b;

#pragma unused(b)

/* Compiler does not warn that b is unused. */

}

19.9

warning

Controls which warning numbers are displayed during compiling.

AN3350 데이터시트(PDF) 142 Page - STMicroelectronics