QA·C Help - 0844

	0844	[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           */

See also:

0835 [C] Macro '%s' is being redefined with different parameter names.
3614 Macro '%s' is being defined more than once without using #undef to remove the previous definition.

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