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

LANG.TYPE.NCGV : Non-const Global Variable

Summary

One of the following.

Properties

Class Name Non-const Global Variable
Significance style
Mnemonic LANG.TYPE.NCGV
Categories
MisraC++2023 MisraC++2023:6.7.2 Global variables shall not be used
CWE CWE:1108 Excessive Reliance on Global Variables
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="Non-const Global Variable"
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 

int       myfunc(void);

// dynamic initialization is not permitted in C and will generally cause a compiler error
#ifdef __cplusplus
int       i1 = myfunc();        // 'Non-const Global Variable' warning issued here for C++
const int i2 = i1;              // 'Non-const Global Variable' warning issued here for C++
                                // - declared const, but dynamically initialized
#endif
const int i3 = 0;                                                 // ok: declared const and statically initialized
int       i4 = 0;               // 'Non-const Global Variable' warning issued here
int       i5;                   // 'Non-const Global Variable' warning issued here

#ifdef __cplusplus
extern int       e1 = myfunc(); // 'Non-const Global Variable' warning issued here for C++
extern const int e2 = i1;       // 'Non-const Global Variable' warning issued here for C++
#endif
extern const int e3 = 0;                                          // ok: declared const and statically initialized
extern int       e4 = 0;        // 'Non-const Global Variable' warning issued here
extern int       e5;                                              // warning not issued here: if another location
                                                                  // initializes e5, a warning will be issued there

#ifdef __cplusplus
static int       s1 = myfunc(); // 'Non-const Global Variable' warning issued here for C++
static const int s2 = i1;       // 'Non-const Global Variable' warning issued here for C++
#endif
static const int s3 = 0;                                          // ok: declared const and statically initialized
static int       s4 = 0;        // 'Non-const Global Variable' warning issued here
static int       s5;            // 'Non-const Global Variable' warning issued here

Relevant Configuration File Parameters

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

 

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