Problems with qt_error_string on linux

qglobal.cpp

QString qt_error_string(int errorCode)
{
    ...
#elif !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && _POSIX_VERSION >= 200112L && !defined(Q_OS_INTEGRITY) && !defined(Q_OS_QNX)
        QByteArray buf(1024, '\0');
        strerror_r(errorCode, buf.data(), buf.size());
        ret = QString::fromLocal8Bit(buf.constData());
#else
        ret = QString::fromLocal8Bit(strerror(errorCode));
#endif
    ...
}

The GNU-specific strerror_r() function so does not work, and in the buffer (buf) writes nothing.

man strerror >
The GNU-specific strerror_r() returns a pointer to a string containing the error message. This may be either a pointer to a string that the function stores in buf, or a pointer to some (immutable) static string (in which case buf is unused).

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And as a result we will not see any message if we will try to print out it as follows
fprintf(stderr, "%s\n", qt_error_string(ENAMETOOLONG).toLocal8Bit().constData());