Upgrade of BOOST 1.36 to 1.43 causes linker error

Question

At work we have an MFC Extension DLL that built fine with 1.36 but when built with 1.43 causes the following error:

error LNK2005: __pRawDllMain already defined in ApObs.obj

If I activate BOOST_LIB_DIAGNOSTIC the old build lists:

linking to lib file: libboost_thread-vc71-mt-gd-1_35.lib

and

linking to lib file: libboost_thread-vc71-mt-gd-1_43.lib

So no change there with which library is linked

The full error message is:

libboost_thread-vc71-mt-gd-1_43.lib(tss_pe.obj) : error LNK2005: __pRawDllMain already defined in ApObs.obj

I have done a diff on tss_pe.cpp in both library versions and they are identical, so I'm not sure what the problem is.

You can get the message to disappear by defining BOOST_THREAD_USE_DLL but then we would need to ship BOOST_THREAD-VC71-MT-GD-1_43.DLL so I don't think this is the best solution.