Synopsis

A variable is neither read nor written for any execution path.

Enabled by default

Yes

Severity/Certainty

Low/High

Full description

A variable is neither read nor written for any execution path. Writing includes initialization, and reading includes passing the variable as a parameter in a function call. This is not unsafe as such, but might indicate a logical error. This check is identical to MISRAC++2008-0-1-3.

Coding standards

Code examples

The following code example fails the check and will give a warning:

int example(void) {
  int x;  //this value is not used  
  return 0;
}

The following code example passes the check and will not give a warning about this issue:

int example(void) {
  int x = 0;  //OK - x is returned  
  return x;
}