LANG.STRUCT.DECL.FAM : Declaration of Flexible Array Member

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C and C++

LANG.STRUCT.DECL.FAM : Declaration of Flexible Array Member

Summary

A struct is declared with a flexible array member.

Properties

Class Name

Declaration of Flexible Array Member

Significance

style

Mnemonic

LANG.STRUCT.DECL.FAM

Categories

MisraC2025	MisraC2025:18.7	Flexible array members shall not be declared
MisraC2023	MisraC2023:18.7	Flexible array members shall not be declared
Misra2012	Misra2012:18.7	Flexible array members shall not be declared
AUTOSARC++14	AUTOSARC++14:A18-1-1	C-style arrays shall not be used.
CERT-C	CERT-C:MEM33-C	Allocate and copy structures containing a flexible array member dynamically

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="Declaration of Flexible Array Member"

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

struct FAM_struct {  int len;  int data[];};         /* 'Declaration of Flexible Array Member' warning issued here */

struct  {  int len;  int data[];} FAM_val;           /* 'Declaration of Flexible Array Member' warning issued here */

typedef struct {  int len;  int data[];} FAM_type;   /* 'Declaration of Flexible Array Member' warning issued here */

struct  { int len; int data[];} prot_retFAM(void);   /* 'Declaration of Flexible Array Member' warning issued here */

struct fixedarr_struct {  int len;  int data[5];};                         /* fixed-length array */

Relevant Configuration File Parameters

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

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