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

JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.

If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.

If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.

If you access the manual through the hub's Web GUI, the functionality will not be suppressed because the hub is a web server.
Alternatively, your browser may allow you to explicitly disable the security setting that suppresses functionality. See the CodeSonar FAQ for more information.

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

A global variable has been declared in multiple places.

Class Name

Multiple Declarations of a Global

Significance

style

Mnemonic

LANG.STRUCT.DECL.MG

Categories

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.

/* 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 */

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

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

Summary

Properties

Example

Relevant Configuration File Parameters