LANG.ID.NU.TAG : Non-unique Identifiers: Tag

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CodeSonar^® 9.2p0

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C and C++

LANG.ID.NU.TAG : Non-unique Identifiers: Tag

Summary

A struct, union, or enum tag name is identical to one or more other identifiers (other than the typedef name with which the tag is associated, if any).

See Identifier Classes for related warning classes.

Properties

Class Name

Non-unique Identifiers: Tag

Significance

style

Mnemonic

LANG.ID.NU.TAG

Categories

MisraC2025	MisraC2025:5.7	A tag name shall be a unique identifier
MisraC2023	MisraC2023:5.7	A tag name shall be a unique identifier
Misra2012	Misra2012:5.7	A tag name shall be a unique identifier
Misra2004	Misra2004:5.4	A tag name shall be a unique identifier
MisraC++2008	MisraC++2008:2-10-4	A class, union or enum name (including qualification, if any) shall be a unique identifier.
CWE	CWE:710	Improper Adherence to Coding Standards
CERT-C	CERT-C:DCL23-C	Guarantee that mutually visible identifiers are unique

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Non-unique Identifiers: Tag"

Example

Suppose fileA.c and fileB.c are both in the analyzed software (but not necessarily in the same compilation unit).

/* LANG.ID.NU.TAG.a.c */

#define tagA 1
extern int tagB;
void tagC(void);

/* LANG.ID.NU.TAG.b.c */

struct tagA {int Aa; int Ab;}; /* 'Non-unique Identifiers: Tag' warning issued here */
enum tagB {Ba, Bb};            /* 'Non-unique Identifiers: Tag' warning issued here */
union tagC {int Ca; char Cb;}; /* 'Non-unique Identifiers: Tag' warning issued here */

Relevant Configuration File Parameters

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

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