0887			[U] Use of 'defined' must match either 'defined(identifier)' or 'defined identifier'.
	Explicitly undefined				REFERENCE - ISO:C90-6.8.1 Conditional Inclusion - Semantics

/*PRQA S 553,2017 ++*/

#if defined(ABC)                   /* OK */
int a = 1;
#endif

#if defined                        /* Message 0887 */
int b = 1;
#endif

#if defined("filename")            /* Message 0887 and also 0888 and 0897 */
int c = 1;
#endif

#if defined 123                    /* Message 0887 and also 0897 */
int d = 1;
#endif

See also:

• 0888 [U] 'defined' requires an identifier as an argument.
• 0897 [S] Missing operator in '#if' or '#elif' expression.