Warning in Boost.Log or Boost.DateTime with VS2017

[christof.krueger@…]

I'm getting the following compiler warning while compiling my code with VS2017 on a Windows 7 machine:

C:\Users\<...>\boost-1_65_1\boost/log/support/date_time.hpp(66): warning C4244: '=': conversion from '__int64' to 'uint32_t', possible loss of data
...
C:\Users\<...>\boost-1_65_1\boost/log/support/date_time.hpp(67): warning C4244: '=': conversion from '__int64' to 'uint32_t', possible loss of data
C:\Users\<...>\boost-1_65_1\boost/log/support/date_time.hpp(68): warning C4244: '=': conversion from '__int64' to 'uint32_t', possible loss of data

I'm using a simple console log (boost::log::add_console_log(std::clog)) wich a formatter created like this:

namespace expr = boost::log::expressions;
auto fmtTimeStamp = expr::format_date_time<boost::posix_time::ptime>("TimeStamp", %Y-%m-%d %H:%M:%S.%f");
boost::log::formatter logFmt
    = expr::format("[%1%] [%2%] {%3%} <%4%> %5%")
        % fmtTimeStamp
        % expr::attr<my_severity_level_type>("Severity")
        % expr::attr<std::string>("ThreadName").or_default(std::string("?"))
        % expr::attr<std::string>("Channel").or_default(std::string("?"))
        % expr::message;

Is there anything I could do about? Or is it something that should be fixed within Boost? I'd like to have warning-free code wherever possible, of course.

[Andrey Semashev]

I believe, this has been fixed in ​https://github.com/boostorg/log/commit/0b4ce57edc6b4f6618349a507d277c09d7f7b675, released in Boost 1.66.