PARSE.IMPLICIT.IOM : Implicit int on main

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CodeSonar^® 9.2p0

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C and C++

PARSE.IMPLICIT.IOM : Implicit int on main

Summary

Special function main() is declared without an explicit return type.

Other functions declared without an explicit return type will trigger Missing Type Specifier or Missing Declaration Specifiers warnings instead.

This warning class is derived from a C/C++ parser warning.

Properties

Class Name

Implicit int on main

Significance

style

Mnemonic

PARSE.IMPLICIT.IOM

Categories

MisraC2025	MisraC2025:8.1	Types shall be explicitly specified
MisraC2023	MisraC2023:8.1	Types shall be explicitly specified
Misra2012	Misra2012:8.1	Types shall be explicitly specified
Misra2004	Misra2004:8.2	Whenever an object or function is declared or defined, its type shall be explicitly stated
CERT-C	CERT-C:DCL07-C	Include the appropriate type information in function declarators

Availability

Available for C and C++.

Enabling

Checks for this warning class are enabled by default. However, warning instances of this class that are issued as parser errors (rather than parser warnings) will be discarded when using factory configuration settings. To prevent these instances from being discarded, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Implicit int on main"

To disable checks for this warning class, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += discard class="Implicit int on main"

Example

/* PARSE.IMPLICIT.IOM.a.c */

main(int argc, char *argv[]){ return 0; }  /* 'Implicit int on main' warning issued here */

/* PARSE.IMPLICIT.IOM.b.c */

int main(int argc, char *argv[]){ return 0; }                     /* explicit return type specifier */

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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