QA·C Help - 0841

	0841	Using '#undef'.

Preprocessing		REFERENCE - ISO:C90-6.8.3.5 Scope of Macro Definitions

#undef has been used to undefine a macro.

Some programming standards prohibit the use of #undef. The use of #undef can inhibit readability and comprehension, especially through header includes.

For example:


/*PRQA S 2017,3211,3408 ++*/

#define MAC 5

int x = MAC;

#undef MAC                      /* Message 0841 */

MISRA C:2012 Rules applicable to message 0841:

Rule-20.5 (Advisory)

#undef should not be used

See also:

0842 Using #define or #undef inside a function.

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MISRA C:2012 Compliance Module 1.0
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