some of my project using boost building with clang-cl but there are still some libraries that don't is there any official interest in supporting clang-cl or is it up to a library maintainer to support it? many project of mine building better and better, boost 1.73 currently is neary full useable with clang-cl without any problems today i tried to compile a 600KLOC project and it failed with the same problem Libreoffice got they are using a patch to "fix" its used boost version https://github.com/LibreOffice/core/blob/62808ef28e05eee4945a6a15d981350d130... https://github.com/boostorg/thread/issues/286 "clang-cl defines _MSC_VER by ms-compatibility but BOOST_MSVC will not be set." still a problem? there are some Issues reported but i don't know if fixes are wanted of if there is a strategy to support clang-cl out of the box