In a large project, we're currently building the thread library as a dll. We're bringing in a new subcomponent that is also building the thread library as a dll. Various issues ensue - we need to eliminate one of them. One solution is to have the subcomponent use a static version of the thread library, or we can try to make the two dlls "identical" so we only need one copy. Regarding the static linkage option, I have read in various places that dll linkage was recommended for the thread library because of thread local storage issues. Those emails were a couple of years old so I am wondering if that has been resolved in the mean time. We're currently using v37 if that matters. Dave Burnard please CC me off-list as I am not a regular boost-users reader.