id summary reporter owner description type status milestone component version severity resolution keywords cc 13167 """Unknown compiler version ..."" with 1.64 on Visual Studio 15.3" Tim Bergel Visual Studio 2017 version 15.3 (4.7.02046) has upped the _MSC_VER define to 1911 (I think previously 1910 in 15.2). This gives a lot of warning messages with 1.64 - I have not tried 1.65 but the release notes do not mention this - and I am reluctant to simply hack boost_1_64_0\boost\config\compiler\visualc.hpp as of course there may actually be an issue. What to do? Bugs closed To Be Determined None Boost 1.65.0 Problem fixed compiler _MSC_VER gfurnish@… daniel.kruegler@…