[Boost-build] How to avoid already defined symbols with shared linkage using some libraries as static?

Subject: [Boost-build] How to avoid already defined symbols with shared linkage using some libraries as static?
From: Dmitry Timoshenko (dimentiy2k_at_[hidden])
Date: 2011-04-02 09:56:56

Hello,

I have two libraries: first (1) & second (2). The 2nd depends on 1st.
The 1st library is only built as static (no dll, small library), but 2nd 
can also be built as shared object.
1st library also have dependensies on boost e.g. on boost_date_time 
libarary.

How can I make bjam always use static boost libraries not depending on 
target's link feature?

The problem occurs in link=shared configruation.
The 2nd refers to 1st that always compiled as static.
Boost libraries that 1st depends on in this case also compiled as 
static, but linker when tries to link 2nd as shared (dll) searches for 
boost compiled as dll.
Such as if boost compiled as dll is not found I get the not found error.
But if it's found (Due to if I put references to necessary boost 
libraries into 2nd's bjam project and libraries get compiled into dll 
aslo in this case)
I get the symbol already defined linker error, due to it's defined by 
both found (just compiled) dll and 1st static library's boost dependencies.

1st build options: toolset=msvc variant=debug,release link=static 
threading=multi runtime-link=shared
2nd build options: toolset=msvc variant=debug link=shared 
threading=multi runtime-link=shared

Below the more detailed description.

The definition of one of the 1st library targets look like:

### smart timers
lib smart_timers
         :    timers.cpp    # sources
              /boost/date_time//boost_date_time

         : <link>static  # requirements
         ;

The 2nd library refers to smart_timers. So when I refers in bjam 2nd's 
library project definition only <libarary>smart_timers. I get the
boost_date_time properly compiled into static lib, due to smart_timers 
(1st lib) refers it within static configuration. Then when the 2nd 
library is being compiled
I get the error:
LINK : fatal error LNK1104: cannot open file 
'boost_date_time-vc80-mt-gd-1_41.lib' due to linker looks for the 
boost_date_time-vc80-mt-gd-1_41.dll
because of 2nd library is compiled with link=shared option. Boost.build 
tries to find data_time.dll, but dll doesn't exists.

When I refers to <library>/boost/date_time//boost_date_time directly 
from 2nd's library bjam project. I get the symbol already defined due to 
it is
'contained/refered' by smart_timers statically built with static 
boost_date_time.
---
msvc.link.dll 
D:\work\libs\1stlibs\unicomm\out\stuff\boost-build\msvc-8.0\debug\threading-multi\unicomm-vc80-debug-1_00.dll
libsmart_timers-vc80-debug-1_00.lib(timers.obj) : error LNK2005: 
"public: __thiscall boost::gregorian::greg_month::greg_month(unsi
gned short)" (??0greg_month_at_gregorian@boost@@QAE_at_G@Z) already defined in 
boost_date_time-vc80-mt-gd-1_41.lib(boost_date_time-vc80-
mt-gd-1_41.dll)
---
Please, could anyone help me, how to resolve this? I also need no to 
build 1st as shared, I need it to be static.
Thank you.