LANG.STRUCT.DEF.NOEXT : Missing External Definition

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CodeSonar^® 9.2p0

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C and C++

LANG.STRUCT.DEF.NOEXT : Missing External Definition

Summary

An identifier with external linkage has no associated definition.

Properties

Class Name

Missing External Definition

Significance

style

Mnemonic

LANG.STRUCT.DEF.NOEXT

Categories

MisraC2025	MisraC2025:8.6	An identifier with external linkage shall have exactly one external definition
MisraC2023	MisraC2023:8.6	An identifier with external linkage shall have exactly one external definition
Misra2012	Misra2012:8.6	An identifier with external linkage shall have exactly one external definition
Misra2004	Misra2004:8.9	An identifier with external linkage shall have exactly one external definition
AUTOSARC++14	AUTOSARC++14:M3-2-2	The One Definition Rule shall not be violated.
	AUTOSARC++14:M3-2-4	An identifier with external linkage shall have exactly one definition.
MisraC++2008	MisraC++2008:3-2-2	The One Definition Rule shall not be violated.
	MisraC++2008:3-2-4	An identifier with external linkage shall have exactly one definition.
MisraC++2023	MisraC++2023:6.2.1	The one-definition rule shall not be violated

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
INCREMENTAL_BUILD = No
WARNING_FILTER += allow class="Missing External Definition"

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

Incrementality Note: This warning class is not available for incremental analyses, even if the class is explicitly enabled.

Example

Suppose the project consists of LANG.STRUCT.DEF.NOEXT.a.c and LANG.STRUCT.DEF.NOEXT.b.c.

/* LANG.STRUCT.DEF.NOEXT.a.c */

int i_def=5;

int f_def( int i){return i;}

/* LANG.STRUCT.DEF.NOEXT.b.c */

extern int i_def;                               /* defined in LANG.STRUCT.DEF.NOEXT.a.c */

extern int i_nodef;         /* 'Missing External Definition' warning issued here */

extern int f_def( int i);                       /* defined in LANG.STRUCT.DEF.NOEXT.a.c */

extern int f_nodef( int i); /* 'Missing External Definition' warning issued here */

Relevant Configuration File Parameters

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

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