LANG.STRUCT.UUVAR : Unused Variable

JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.

If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.

If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.

If you access the manual through the hub's Web GUI, the functionality will not be suppressed because the hub is a web server.
Alternatively, your browser may allow you to explicitly disable the security setting that suppresses functionality. See the CodeSonar FAQ for more information.

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

Class Name

Unused Variable

Significance

style

Mnemonic

LANG.STRUCT.UUVAR

Categories

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.
	AUTOSARC++14:M0-1-4	A project shall not contain non-volatile POD variables having only one use.
MisraC++2008	MisraC++2008:0-1-3	A project shall not contain unused variables.
	MisraC++2008:0-1-4	A project shall not contain non-volatile POD variables having only one use.
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"

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;
}

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

LANG.STRUCT.UUVAR : Unused Variable

Summary

Properties

Example

Relevant Configuration File Parameters