Now I know that auto-link specifies it is an #error if one tries to create a dynamic link library, using BOOST_DYN_LINK, when one is using the static version of the RTL. I am wondering why this is any less of a problem than if one attempts to create a static library using the DLL version of the RTL. Despite the fact that I don't like either mixture, I would welcome an explanation of why one is allowable, and safe, and the other is not. But given that the latter is considered allowable and the former not, I would suggest, along with my beginning suggestion, that BOOST_DYN_LINK be removed and that BOOST_STATIC_LINK be added to coerce the creation of a static library when linking to the DLL version of the RTL.
That's the way the regex used to work, I changed that for regex because folks were complaining that they wanted static linking as the default (smaller code size, no redistributables etc), the auto-link code then followed regexes lead... John.