Rule M16-0-7 (required, implementation, automated)
Undefined macro identifiers shall not be used in #if or #elif preprocessor directives, except as operands to the defined operator. See MISRA C++ 2008 [7] Note: “#if” and “#elif” are anyway only allowed for conditional file inclusion, see A160-1. This rule is kept in case A16-0-1 is disabled in a project.