Synopsis

(Required) Precautions shall be taken in order to prevent the contents of a header file being included more than once

Enabled by default

Yes

Severity/Certainty

Low/Low

Full description

Header files were found without #include guards. This check is identical to MISRAC2004-19.15, MISRAC++2008-16-2-3, MISRAC++2023-19.2.1.

Coding standards

Code examples

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

#include "unguarded_header.h"
void example(void) {}

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

#include <stdlib.h>
#include "header.h"	/* contains #ifndef HDR #define HDR ... #endif */
void example(void) {}