Skip to main content

IAR Embedded Workbench for RH850 3.20.x

FUNC-implicit-decl

In this section:
Synopsis

Functions are used without prototyping.

Enabled by default

No

Severity/Certainty

Medium/High

mediumhigh.png
Full description

Functions are used without prototyping. Functions must be prototyped before use. This check is identical to MISRAC2004-8.1, MISRAC2012-Rule-17.3, CERT-DCL31-C.

Coding standards
CERT DCL31-C

Declare identifiers before using them

MISRA C:2004 8.1

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

MISRA C:2012 Rule-17.3

(Mandatory) A function shall not be declared implicitly

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();
}