QA·C Help - 0835

	0835	[C] Macro '%s' is being redefined with different parameter names.

Constraint violations		REFERENCE - ISO:C90-6.8.3 Macro Replacement - Constraints

This is a constraint error

A #define directive has attempted to redefine a function-like macro with a definition which is identical in all respects except for the names of the parameters. A #define directive cannot redefine an existing function-like 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 553,841,2017,3429,3435,3453,3456,3614 ++*/

#define M1(a,b) ((a) + (b))
#define M2(a,b) ((a) + (b))
#define M3(a,b) ((a) + (b))

#define M1(x,y) ((x) + (y))         /* Message 0835 - different parameter names */

#define M2(a,b) ((a) + 2 * (b))     /* Message 0844 - different replacement list */

#undef M3
#define M3(x,y) ((x) + 2 * (y))     /* OK           */

See also:

0844 [C] Macro '%s' is being redefined with a different replacement list.
3614 Macro '%s' is being defined more than once without using #undef to remove the previous definition.

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