Rule 12.5: OR sequence without parentheses not compliant?

[Achim Olaf Zacher]

Hello,

Rule 12.1 explicitly mentions C's operator precedence in expressions.
Rule 12.5 is a special case of rule 12.1.

What about compiler switches or preprocessor statements?

#if !defined(__cplusplus) || defined(__STDC_LIMIT_MACROS)

are braces (parentheses) required here? (found in vendor header files)

Thanks in advance