[previous] 0556 [next] [C] Left operand of assignment must be a modifiable object.
Constraint violations REFERENCE - ISO:C90-6.3.16 Assignment Operators - Constraints

This is a constraint error

An attempt is being made to assign to an object which is not a modifiable lvalue. For example: 


/*PRQA S 3132,3227,3313,3408,3447,3602,3617 ++*/

extern struct ST stx;       /* ST is incomplete type */
extern struct ST sty;

extern int lbuf[10];
extern const int ci;

void foo(int mode)
{
    lbuf = mode;            /* Message 0556 and also 0555 */
    ci = mode;              /* Message 0556               */
    stx = sty;              /* Message 0556 and also 0545 */
}

MISRA-C:2004 Rules applicable to message 0556:

Rule  1.1  (Required) All code shall conform to ISO/IEC 9899:1990 C programming language, ISO 9899, amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2: 1996192

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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