Function isCpp17OrLater

externals/simplecpp/simplecpp.cpp:2649–2653

}

static bool isCpp17OrLater(const simplecpp::DUI &dui)
{
    const std::string std_ver = simplecpp::getCppStdString(dui.std);
    return std_ver.empty() || (std_ver >= "201703L");
}

static bool isGnu(const simplecpp::DUI &dui)
{