Sample reproducer:

"""
#include <vector>

int main()
{
    std::vector<int> bits(128, 1);
    const std::size_t errorCount = 0;
    // constexpr std::size_t errorCount = 0;
    if (errorCount != 0)
    // if constexpr (errorCount != 0)
    {
        for (std::size_t i = 0; i < bits.size(); i += bits.size() / errorCount)
        {
            bits[i] = 0;
        }
    }
}
"""

Will error with -Wall -Wextra -Werror. Issue happens with 4.1.2 and newer.

""""
<source>: In function 'int main()':
<source>:9:67: error: division by zero [-Werror=div-by-zero]
    9 |         for (std::size_t i = 0; i < bits.size(); i += bits.size() / errorCount)
        |                                                       ~~~~~~~~~~~~^~~~~~~~~~~~
cc1plus: all warnings being treated as errors
Compiler returned: 1
"""