[mailto:boost-users-bounces@lists.boost.org] On Behalf Of John Maddock

It's only useful if your compiler supports it, period.

However, those compilers that do support it typically have a number of different binary-incompatible build variants: figuring out which lib variant to link against without it in those cases is tricky, this is a frequent cause of problem reports caused by picking the wrong variant.

I guess none of this is really news to me. Thanks for your reply.