QA·C Help - 0618

	0618	[C99] 'volatile' qualifier has been duplicated.

ISO C99 Language features		REFERENCE - ISO:C90-6.5.3 Type Qualifiers, ISO:C99-6.7.3 Type Qualifiers

This is a constraint error in ISO:C90 but is permitted in ISO:C99. A redundant 'volatile' type qualifier has been used in this declaration.

Notice that the syntax of the C language allows a type qualifier to be located either before or after a type specifier, but to include it twice is unnecessary and confusing.

For example:


/*PRQA S 553,1305,3210,3211,3408,3447,3448,3602 ++*/


extern volatile int                     v1;
extern int volatile                     v2;
extern volatile volatile int            v3;     /* Message 0618 - second volatile is redundant */
extern volatile int volatile            v4;     /* Message 0618 - second volatile is redundant */
extern int volatile volatile            v5;     /* Message 0618 - second volatile is redundant */


extern volatile int *                   p1;     /*              - pointer to volatile int */
extern int volatile *                   p2;     /*              - pointer to volatile int */
extern int * volatile                   p3;     /*              - volatile pointer to int */
extern volatile int * volatile          p4;     /*              - volatile pointer to volatile int */
extern int volatile * volatile          p5;     /*              - volatile pointer to volatile int */
extern volatile int volatile *          p6;     /* Message 0618 - second volatile is redundant */
extern volatile int volatile * volatile p7;     /* Message 0618 - second volatile is redundant */

typedef volatile int T1;
extern volatile T1                      x1;     /* Message 0618 - volatile is redundant */

MISRA-C:2004 Rules applicable to message 0618:

Rule 1.1 (Required)

All code shall conform to ISO/IEC 9899:1990 C programming language, ISO 9899, amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2: 1996192