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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

LANG.STRUCT.DECL.IF : Inconsistent Function Declarations

Summary

A function has multiple declarations, and the declarations differ in one or more of the following.

Properties

Class Name Inconsistent Function Declarations
Significance reliability
Mnemonic LANG.STRUCT.DECL.IF
Categories
MisraC2025 MisraC2025:8.3 All declarations of an object or function shall use the same names and type qualifiers
MisraC2023 MisraC2023:8.3 All declarations of an object or function shall use the same names and type qualifiers
Misra2012 Misra2012:8.3 All declarations of an object or function shall use the same names and type qualifiers
Misra2004 Misra2004:8.3 For each function parameter the type given in the declaration and definition shall be identical, and the return types shall also be identical
  Misra2004:8.4 If objects or functions are declared more than once their types shall be compatible
  Misra2004:16.4 The identifiers used in the declaration and definition of a function shall be identical
AUTOSARC++14 AUTOSARC++14:M3-2-1 All declarations of an object or function shall have compatible types.
  AUTOSARC++14:M3-9-1 The types used for an object, a function return type, or a function parameter shall be token-for-token identical in all declarations and re-declarations.
  AUTOSARC++14:M8-4-2 The identifiers used for the parameters in a re-declaration of a function shall be identical to those in the declaration.
MisraC++2008 MisraC++2008:3-2-1 All declarations of an object or function shall have compatible types.
  MisraC++2008:3-9-1 The types used for an object, a function return type, or a function parameter shall be token-for-token identical in all declarations and re-declarations.
  MisraC++2008:8-4-2 The identifiers used for the parameters in a re-declaration of a function shall be identical to those in the declaration.
MisraC++2023 MisraC++2023:6.2.2 All declarations of a variable or function shall have the same type
  MisraC++2023:6.9.1 The same type aliases shall be used in all declarations and re- declarations of the same entity
  MisraC++2023:13.3.3 The parameters in all declarations or overrides of a function shall either be unnamed or have identical names
TS17961 TS17961:5.6-argcomp Calling functions with incorrect arguments
  TS17961:5.13-funcdecl Declaring the same function or object in incompatible ways
CERT-C CERT-C:DCL40-C Do not create incompatible declarations of the same function or object
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="Inconsistent Function Declarations"
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 contains files LANG.STRUCT.DECL.IF.a.c and LANG.STRUCT.DECL.IF.b.c. They do not need to be in the same compilation unit.

/* LANG.STRUCT.DECL.IF.a.c */
        
int f_incons_pqual(int i);

int f_incons_ptype(int i);      /* 'Inconsistent Function Declarations' warning issued here
                                 * f_incons_ptype has declared types int(int) and int(intalias)
                                 * (even though int and intalias are underlyingly the same type) */

int f_incons_param(int x);     /* 'Inconsistent Function Declarations' warning issued here
                                * f_incons_param is declared with parameter names that are
                                * different, even though they're the same type. */

int f_cons(int i);

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

typedef int intalias;

int f_incons_ptype(intalias i);

int f_incons_pqual(const int i);/* 'Inconsistent Function Declarations' warning issued here
                                 * f_incons_pqual has declared types int(int) and int(const int) */

int f_incons_param(int y);     /* 'Inconsistent Function Declarations' warning issued here
                                * because the parameter f_incons_param has a different name
                                * in the other declaration */

int f_cons(int i);              /* consistent */

Relevant Configuration File Parameters

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

 

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