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MISRA Discussion Forums > MISRA C > MISRA-C: 2004 rules > 6.19 Preprocessing Directives > macro contains unaceptable items misra c 2004 19.4
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manojkdi

31-07-2013, 11:35 AM
Example

#define MACRO_2 1(this macro is defined in some other file)

#define MACRO_1 MACRO_2

this statement is causing the warning in "macro contains unacceptable items misra c 2004 19.4".Is this warning valid? Is it really a invalid macro definition?

misra-c

11-09-2013, 11:03 AM
This example has previously caused much debate within the team!

Under a strict interpretation of the Rules, then MACRO_2 probably should be in braces... but that is clearly unnecessary, probably unintentional, and serves no purpose.

For MISRA C:2012 the ambiguity is removed, and there is no requirement to add the additional parentheses.
MISRA Discussion Forums > MISRA C > MISRA-C: 2004 rules > 6.19 Preprocessing Directives > macro contains unaceptable items misra c 2004 19.4