[Boost-build] Boost thread gcc/msvc, library linking depending on OS

Subject: [Boost-build] Boost thread gcc/msvc, library linking depending on OS
From: Christian Auby (christian_at_[hidden])
Date: 2009-09-29 04:04:33

Two questions:

1. I have a jamfile with "requirements <threading>multi" in project, and 
/boost//thread in the lib that uses boost thread. I have to require the 
lib directly as gcc doesn't do auto-linking. Now, this builds on both 
gcc and msvc, but with msvc I get this warning:

library\library.cpp(1) : warning C4005: 'BOOST_THREAD_USE_LIB' : macro 
redefinition
         d:\dev\libs\boost\include\boost/thread/detail/config.hpp(37) : 
see previous definition of 'BOOST_THREAD_USE_LIB'

It happens for every file in that lib. GCC compiles without warnings. 
Why does this happen and how do I prevent it? If I remove 
"/boost//thread" it compiles without warnings on msvc but then it won't 
compile on gcc so that's not a good workaround for me.

2. Since my jamfile must support both msvc and gcc I have to 
explicatively link libraries. One such library is libws2_32 (winsock 2). 
How do I link this only when compiling on Windows? I use a third party 
lib that requires ws2 on windows.

Regards,

Christian