LANG.STRUCT.DECL.MG : Multiple Declarations of a Global

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C and C++

LANG.STRUCT.DECL.MG : Multiple Declarations of a Global

Summary

A global variable has been declared in multiple places.

Properties

Class Name

Multiple Declarations of a Global

Significance

style

Mnemonic

LANG.STRUCT.DECL.MG

Categories

MisraC2025	MisraC2025:8.5	An external object or function shall be declared once in one and only one file
MisraC2023	MisraC2023:8.5	An external object or function shall be declared once in one and only one file
Misra2012	Misra2012:8.5	An external object or function shall be declared once in one and only one file
Misra2004	Misra2004:8.8	An external object or function shall be declared in one and only one file
AUTOSARC++14	AUTOSARC++14:M3-2-3	A type, object or function that is used in multiple translation units shall be declared in one and only one file.
MisraC++2008	MisraC++2008:3-2-3	A type, object or function that is used in multiple translation units shall be declared in one and only one file.
CWE	CWE:710	Improper Adherence to Coding Standards
JSF++	JSF++:40	Every implementation file shall include the header files that uniquely define the inline functions, types, and templates used.

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="Multiple Declarations of a Global"

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

Example

/* LANG.STRUCT.DECL.MG.a.c */

extern int Pid;

/* LANG.STRUCT.DECL.MG.b.c */

extern int Pid; /* 'Multiple Declarations of a Global' warning issued here */

Relevant Configuration File Parameters

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

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