Why does CppCheck flag static constexpr members as unusedStructMember, when it is used later in the struct definition

Question

CppCheck is flagging the definition of BufLen as an unusedStructMember, even though it is used on the next line to define the length of the array.

(style) struct member 'TxDetails_t::BufLen' is never used. [unusedStructMember]

static struct TxDetails_t
{
    static constexpr int32_t BufLen = 128;  
    
    uint8_t buffer[BufLen];
    uint8_t* ptr;
    int32_t num_bytes;
    
} TxData;

Is CppCheck wrong to report this, or is there a better way for me to define this struct?

sounds like something you should report to the authors of cppcheck — Alan Birtles, Jan 10 '22 at 15:15
@NicolBolas Nevertheless, it would reduce the scope of the bug, if any. — Spencer, Jan 10 '22 at 17:48

Firewave · Accepted Answer · 2022-01-11T10:27:08.447

1

This is indeed a false positive and it is fixed in the upcoming Cppcheck 2.7. I can reproduce it with 2.6 but not with the latest head.

Looking at the list of fixed issues it appears you encountered https://trac.cppcheck.net/ticket/10485.

edited Jan 11 '22 at 10:27

answered Jan 10 '22 at 18:22

Firewave

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Why does CppCheck flag static constexpr members as unusedStructMember, when it is used later in the struct definition

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