Synopsis

(Required) A type, object or function that is used in multiple translation units shall be declared in one and only one file.

Enabled by default

Yes

Severity/Certainty

Low/Medium

Full description

Multiple declarations of the same external object or function were found. This check is identical to MISRAC2012-Rule-8.5_a, MISRAC2004-8.8_a.

Coding standards

Code examples

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

extern int x;
extern int x;
int x = 1;

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

extern int x;
int x = 1;