title: Can't build Boost 64 bit dynamic libraries, only static
body: <p>I have recently acquired Visual Studio 2010 through Dreamspark, so I can now compile 64 bit applications and libraries.  I then compiled the Boost 1.47 libraries with Bjam using the following line for input.</p>
  
  <pre><code>.\b2 -a -d 0 -q -j 4 -d 0 --variant=debug,release --link=shared,static --threading=multi --address-model=32 --toolset=msvc-10.0
  </code></pre>
  
  <p>When I do, I get 4 of each library (static-debug, dynamic-debug, static-release, dynamic-release).
  After they are compiled, I move them into another directory called win32libs.  I then use the exact same line to compile the 64 bit versions, but switch the address model to 64 (I know they are almost identical because I copy and past from the same text document I made to make compiling them easy).  When I go into my stage directory after the 64 bit compilation, I only see .lib, no .dll.  Is this an issue with what I'm doing, or is in some way, 64 bit dlls not supported?</p>
  
  <p>Thanks</p>