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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

LANG.STRUCT.UUVAR : Unused Variable

Summary

A local variable is declared but is not used within the scope of the declaration.

See also Declared but Not Referenced

Properties

Class Name Unused Variable
Significance style
Mnemonic LANG.STRUCT.UUVAR
Categories
MisraC2025 MisraC2025:2.8 A project should not contain unused object definitions
MisraC2023 MisraC2023:2.8 A project should not contain unused object definitions
Misra2012 Misra2012:2.8 A project should not contain unused object definitions
AUTOSARC++14 AUTOSARC++14:M0-1-3 A project shall not contain unused variables.
MisraC++2008 MisraC++2008:0-1-3 A project shall not contain unused variables.
MisraC++2023 MisraC++2023:0.2.1 Variables with limited visibility should be used at least once
CERT-C CERT-C:MSC12-C Detect and remove code that has no effect or is never executed
DISA-3r10 DISA-3r10:V-6149 The designer will ensure the application does not contain source code that is never invoked during operation, except for software components and libraries from approved third-party products.
Availability Available for C and C++.
Enabling Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file. 
WARNING_FILTER += allow class="Unused Variable"

Example

Suppose the analyzed project has a single source file, fileA.c.

int lang_struct_uuvar(int a){
  int x; /* 'Unused Variable' warning issued here */
  int y;                  /* used later in function */

  y = a + 2;
  return y;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

 

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