Synopsis

(Required) Functions shall have prototype declarations and the prototype shall be visible at both the function definition and call.

Enabled by default

Yes

Severity/Certainty

Medium/High

Full description

Functions were found that are used despite not having a valid prototype. This check is identical to FUNC-implicit-decl, MISRAC2012-Rule-17.3, CERT-DCL31-C.

Coding standards

Code examples

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

void func2(void)
{
    func();
}

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

void func(void);
void func2(void)
{
    func();
}