0888			[U] 'defined' requires an identifier as an argument.
	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 ( )                    /* Message 0888 and also 0887 and 0897 */
int c = 1;
#endif

#if defined (-X)                   /* Message 0888 and also 0887 and 0897 */
int d = 1;
#endif

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

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

See also:

• 0887 [U] Use of 'defined' must match either 'defined(identifier)' or 'defined identifier'.
• 0897 [S] Missing operator in '#if' or '#elif' expression.