Link error with CVS code for MSVC-8.0 x64 builds

Hi, I've been adapting a project to use the latest ASIO CVS and I've 
encountered a link problem which only manifests itself with MSVC-8.0 x64 
builds.

I'm using the asio.hpp header to blanket include all asio headers. 
Builds with MSVC 7.1 or 8.0 32 bit work. For 64bit builds I get numerous 
duplicate symbol errors all for the same symbol:

error LNK2005: "unsigned __int64 __cdecl 
asio::detail::hash_value(unsigned __int64)" 
(?hash_value@detail@asio@@YA_K_K@Z) already defined in .....

Hope this is helpful to you for tracking down the problem.

Kind regards, Eoin.

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