[previous] 2134 [next] Default argument promotion : signed bit-field promoted to signed int.
Arithmetic type - Integral promotion REFERENCE - ISO:C90-6.3.2.2 Function Calls, 6.5.4.3 Function Declarators, 7.8.1 Variable argument list access macros

A bit-field of signed type is being used as an argument in a function call and is being converted to type signed int according to the rules of default argument promotion.

This message will be generated if the function has not been declared or has been declared with an old style declaration. It will not be generated when default argument promotion results from a call to a function declared with a variable argument list.

For example: 


/*PRQA S 1302,1303,2017,3131,3200,3209,3227,3408,3447,3602,3621 ++*/

struct ST
{
    signed int sib3:3;
    signed int sib5:5;
};

extern struct ST stx;

extern void f1(int n, signed char p);           /*              - new style function declaration   */
extern void f3();                               /* Message 3001 - old style function declaration   */
extern void f4(int n, ...);                     /*              - new style with variable arg list */

extern void foo(void)
{
    f1(1, stx.sib3);                           /*                                      */
    f2(1, stx.sib3);                           /* Message 2134 + 3335 - no declaration */
    f3(1, stx.sib3);                           /* Message 2134                         */
    f4(1, stx.sib3);                           /*                                      */
}

No MISRA C:2012 Rules applicable to message 2134

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