False-positive redundant assignment

[Daniel]

The following false-positive occurs when using multiple structs in the same union:

(style) Variable 'm.u16.ab' is reassigned a value before the old one has been used. [redundantAssignment]

/* Fixed-point math union */
typedef union fixed32_union {
    struct {
        unsigned32 abcd;
    } u32;
    struct {
        unsigned16 ab;
        unsigned16 cd;
    } u16;
    struct {
        unsigned8 a;
        unsigned8 b;
        unsigned8 c;
        unsigned8 d;
    } u8;
} fixed32;

void func1(void) {
    fixed32 m;
    m.u16.ab = 47;
    m.u16.cd = 0;
    m.u16.ab = m.u32.abcd / 53;
}

[CHR]

Thanks for reporting, I've added your example to this ticket: https://trac.cppcheck.net/ticket/10093