MISRA C:2012  Rule-20.9:  (Required)			All identifiers used in the controlling expression of #if or #elif preprocessing directives shall be #define'd before evaluation

Amplification:

As well as using a #define preprocessor directive, identifiers may effectively be #define'd in other, implementation-defined, ways. For example some implementations support:

• Using a compiler command-line option, such as -D to allow identifiers to be defined prior to translation;
• Using environment variables to achieve the same effect;
• Pre-defined identifiers provided by the compiler.

Example Code:

#include "misra.h"
#include "m3cmex.h"

#if X < 0                               /* 3332 */
#define M 1
#endif

extern int16_t rule_2009( void )
{
   return 1;
}

QAC messages that encompass this guideline:

3332	The macro '%s' used in this '#if' or '#elif' expression is not defined.

(c) The Motor Industry Research Association, 2012

QA C Source Code Analyser 8.1.2 MISRA C:2012 Compliance Module 1.0 © 2013 Programming Research www.programmingresearch.com

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