LANG.ID.ND.MM : Non-distinct Identifiers: Macro/Macro

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Two or more macro names have the same first N (case-sensitive) characters, where N depends on the setting of SIGNIFICANCE_LEN_MACRO.

See Identifier Classes for related warning classes.

Class Name

Non-distinct Identifiers: Macro/Macro

Significance

style

Mnemonic

LANG.ID.ND.MM

Categories

MisraC2023	MisraC2023:5.4	Macro identifiers shall be distinct
Misra2012	Misra2012:5.4	Macro identifiers shall be distinct
Misra2004	Misra2004:5.1	Identifiers (internal and external) shall not rely on the significance of more than 31 characters
CWE	CWE:710	Improper Adherence to Coding Standards
CERT-C	CERT-C:DCL23-C	Guarantee that mutually visible identifiers are unique
JSF++	JSF++:46	User-specified identifiers (internal and external) will not rely on significance of more than 64 characters.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Non-distinct Identifiers: Macro/Macro"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

/* pair 1:  distinct in first 31 characters */
#define macroneitherA 1
#define macroneitherB 1

/* pair 2: distinct in first 63 characters; not distinct in first 31 characters
 *  - 'Non-distinct Identifiers: Macro/Macro' warning issued for C90 only */
#define macroc90only123456789012345678901234567890A 1
#define macroc90only123456789012345678901234567890B 1

/* pair 3: not distinct in first 63 characters
 *  - 'Non-distinct Identifiers: Macro/Macro' warning issued for both C90 and C99 */
#define macroboth123456789012345678901234567890123456789012345678901234567890A 1
#define macroboth123456789012345678901234567890123456789012345678901234567890B 1

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

LANG.ID.ND.MM : Non-distinct Identifiers: Macro/Macro

Summary

Properties

Example

Relevant Configuration File Parameters