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MISRA Discussion Forums > MISRA C > MISRA C:2012 and MISRA C:2023 guidelines > 8.2 Unused code > Rule 2.5 Does #undef count as a "use"
Full Version: Rule 2.5 Does #undef count as a "use"
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misra-c

09-10-2014, 08:31 AM
Rule 2.5 Is #undef considered a “use” of a macro”?
For example
Code:
#define M1 This
   #define M2 That
   #undef M1
   use( M2 );
Is 'M1' unused and therefore violate rule 2.5, or does the #undef count as a use of M1?

misra-c

09-10-2014, 08:33 AM
Similarly:
Code:
#define M3 first
   #undef M3
   #define M3 second
   use( M3 );
Is the first #define of M3 unused?

misra-c

09-10-2014, 08:33 AM
#undef is considered to be a use of the macro. There are no violations of rule 2.5 in these examples

xiangke

09-06-2017, 09:47 AM
Rule 2.5 Is #undef considered a “use” of a macro”?
For example
CODE: SELECT ALL
#define M1 This
#define M2 That
#undef M1
use( M2 );

Is 'M1' unused and therefore violate rule 2.5, or does the #undef count as a use of M1?

using #undef is a violation for Rule 20.5. #undef used is not appreciated for MISRA C 2012. so, For me, #undef count can not be recognized as a use of M1? the above code should is a violation for rule 2.5.
MISRA Discussion Forums > MISRA C > MISRA C:2012 and MISRA C:2023 guidelines > 8.2 Unused code > Rule 2.5 Does #undef count as a "use"