LANG.STRUCT.DECL.IMPFN : Implicit Function Declaration

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A function is invoked, but it has not yet been declared.

Class Name

Implicit Function Declaration

Significance

style

Mnemonic

LANG.STRUCT.DECL.IMPFN

Categories

MisraC2023	MisraC2023:17.3	A function shall not be declared implicitly
Misra2012	Misra2012:17.3	A function shall not be declared implicitly
Misra2004	Misra2004:8.1	Functions shall have prototype declarations and the prototype shall be visible at both the function definition and call
AUTOSARC++14	AUTOSARC++14:A1-1-1	All code shall conform to ISO/IEC 14882:2014 - Programming Language C++ and shall not use deprecated features.
MisraC++2023	MisraC++2023:4.1.2	Deprecated features should not be used
CWE	CWE:686	Function Call With Incorrect Argument Type
CERT-C	CERT-C:MSC23-C	Beware of vendor-specific library and language differences

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="Implicit Function Declaration"

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

int f(double a);   
 
int lang_struct_decl_impfn_before(double a){
    return f(a);                                          /* f() already declared */             
}
 
int lang_struct_decl_impfn_none(double a){
    return g(a);                 /* 'Implicit Function Declaration' warning issued here
                                  * - g() never declared */
}
 
int lang_struct_decl_impfn_after(double a){
  return h(a);                   /* 'Implicit Function Declaration' warning issued here
                                  * - h() declared after invocation */
}

int h(double a);

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

LANG.STRUCT.DECL.IMPFN : Implicit Function Declaration

Summary

Properties

Example

Relevant Configuration File Parameters