The XM_CONST and XM_CONSTEXPR macros were introduced to work around bugs in VS 2015 RTM (and 2013). These are no longer needed with VS 2015 retirement.
Note that the Xbox One XDK variant build of this library will still build for VS 2015 Update 3, but otherwise VS 2017 is the minimum for GitHub version
The
XM_CONSTandXM_CONSTEXPRmacros were introduced to work around bugs in VS 2015 RTM (and 2013). These are no longer needed with VS 2015 retirement.