[previous] 0844 [next] [C] Macro '%s' is being redefined with a different replacement list.
Constraint violations REFERENCE - ISO:C90-6.8.3 Macro Replacement - Constraints

This is a constraint error

A #define directive has attempted to redefine a macro. A #define directive cannot redefine an existing macro unless the definitions are identical (apart from white space differences). It is seldom wise to change the definition of an existing macro, but if it is really necessary, the #undef directive must be used first.

For example: 


/*PRQA S 553,841,2017,3429,3453,3614 ++*/

#define M1 10
#define M2 10
#define FM1(a,b) ((a) + (b))
#define FM2(a,b) ((a) + (b))


#define M1 20                                  /* Message 0844 */

#undef M2
#define M2 20                                  /* OK           */

#define FM1(a,b) ((a) + 2 * (b))               /* Message 0844 */

#undef FM2
#define FM2(a,b) ((a) + 2 * (b))               /* OK           */

MISRA-C:2004 Rules applicable to message 0844:

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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