[previous] 3659 [next] Unnamed zero-width bit-field declared with a signed type.
Arrays, structures, unions and bit-fields REFERENCE - ISO:C90-6.5.2.1 Structure and Union Specifiers - Semantics

An unnamed zero-width bit-field has been declared with a signed type.

The declaration of an unnamed bit-field with a width of 0 indicates that no further bit-field is to be packed into the unit in which the previous bit-field, if any, was placed. It actually makes no difference whether unnamed bit-fields are of signed type or unsigned type; but message 3659 exists to enforce the arbitrary requirement that they should be unsigned.

For example: 


/*PRQA S 3131,3211,3408,3602,3621 ++*/

struct FSI {
   unsigned int   a:4;
   unsigned int    :0;            /*              */
   signed int     b:4;
   signed int      :0;            /* Message 3659 */
   unsigned int   c:4;
} fsi;

QA·C Source Code Analyser 8.1.2
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