CODEWITHSUNDEEP
cpointersvisual-c++constants
diapir
diapir

Reputation: 3040

MSVC const correctness : spurious C4090 warning

MSVC emits warning C4090 about const correctness while both GCC and Clang accept it : Compiler Explorer.

void dummy(void)
{
    int i[42];
    int *pi[42];
    int const *pci[42];
    memset(i, 0, sizeof i);
    memset(pi, 0, sizeof pi);
    memset(pci, 0, sizeof pci); // warning C4090: 'function': different 'const' qualifiers
}

It seems MSVC treats pci as constant when it's not.

This bug is apparently awfully old. Any idea how to fix this without turning C4090 off ?

Upvotes: 2

Views: 269

Answers (1)

Alex Lop.
Alex Lop.

Reputation: 6875

You can disable this warning right before the line which invokes it and restore it back afterwards https://godbolt.org/z/W-XR-Q:

#include <string.h>

void dummy(void)
{
    int i[42];
    int *pi[42];
    const int *pci[42];

    memset(i, 0, sizeof i);
    memset(pi, 0, sizeof pi);

#pragma warning( push )
#pragma warning( disable : 4090)
    memset(pci, 0, sizeof pci); // NO warning C4090
#pragma warning( pop ) 
}

Upvotes: 3

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