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Rule 14.3 and preprocessor constants
#1
Hi,


I have a question regarding a reported MISRA violation in our code, which isn't completely clear to me after reading the MISRA Guidelines.

Does the MISRA C:2012 Rule 14.3 (Controlling expressions shall not be invariant) also apply to predefined constants, which include function-lika macros?

Example:

Code:
#define ROUND_TO(type, val) ((type) (((val) < 0.0) ? ((val) - 0.5) : ((val) + 0.5)))

#define RMS_TO_AVERAGE  ROUND_TO(uint16_t, ((70.0) / (1.11)))


In this case the expression ((val) < 0.0) is invariant, but it is only once used initialising a constant (RMS_TO_AVERAGE).


Regards, Kevin
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Rule 14.3 and preprocessor constants - by hummelvario - 01-10-2021, 09:31 AM

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