In present, with --build-type=complete all variants with <link>shared and <runtime-link>static are explicitly not built, because they are deemed risky. The code to exclude those variants is written in such a way that: 1. It produces pile of unclear messages. 2. It prevent build of those variants no matter what -- even if you specify this explicitly on command line, you'll get nothing built. I am fixing (1) and this allows (2) to be changed. Should I? In other words, what should happen if user say: bjam link=shared runtime-link=static ? Options are: 1. This variant is built. 2. This variant is built, a huge warning is printed. 3. Error is emitted, user can pass --yes-I-know-what-I'm-doing to build 4. Error is emitted. I believe that on Linux, (4) is most appropriate. I don't know about Windows. Comments? - Volodya