Boost linker error: Unresolved external symbol “class boost::system::error_category const & __cdecl boost::system::get_system_category(void)”

问题

I'm just getting started with Boost for the first time, details:

1. I'm using Visual Studio 2008 SP1
2. I'm doing an x64 Build
3. I'm using boost::asio only (and any dependencies it has)

My code now compiles, and I pointed my project at the boost libraries (after having built x64 libs) and got past simple issues, now I am facing a linker error:

2>BaseWebServer.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_system_category(void)" (?get_system_category@system@boost@@YAAEBVerror_category@12@XZ)
2>BaseWebServer.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_generic_category(void)" (?get_generic_category@system@boost@@YAAEBVerror_category@12@XZ)

any ideas?

---

I added this define: #define BOOST_LIB_DIAGNOSTIC

And now in my output I see this:

1>Linking to lib file: libboost_system-vc90-mt-1_38.lib
1>Linking to lib file: libboost_date_time-vc90-mt-1_38.lib
1>Linking to lib file: libboost_regex-vc90-mt-1_38.lib

which seems to indicate it is infact linking in the system lib.

回答1:

I solved the problem. I had built 32-bit libraries when I had intended to build 64-bit libraries. I fixed up my build statement, and built 64-bit libraries, and now it works.

Here is my bjam command line:

C:\Program Files (x86)\boost\boost_1_38>bjam --build-dir=c:\boost --build-type=complete --toolset=msvc-9.0 address-model=64 architecture=x86 --with-system

回答2:

#include <boost/system/config.hpp>

In my case, BOOST_LIB_DIAGNOSTIC did not show system being automatically linked in. I resolved this by simply including boost/system/config.hpp.

回答3:

You need to link in the boost_system library

回答4:

I had the same problem. I tried all described above, but nothing helps. The solution was simple: first I worked with an empty project and there I had linker error LNK2019. But when I created new default Win32 console application with stdafx.h, targetver.h and stdafx.cpp files everything worked. May be it will be useful for somebody, I spend two days for this

回答5:

If you use boost::system in your project, you should use and appoint the x86 or x64 version of boost::system lib.

You can recompile Boost library with the following batch file. Save these to the Boost root folder and run it in CMD Windows (don't double click!):

call "%VS140COMNTOOLS%..\..\VC\vcvarsall.bat" x86


cd boost_1_60_0
call bootstrap.bat

rem Most libraries can be static libraries
b2 -j8 toolset=msvc-14.0 address-model=64 architecture=x86 link=static threading=multi runtime-link=shared --build-type=minimal stage --stagedir=stage/x64
b2 -j8 toolset=msvc-14.0 address-model=32 architecture=x86 link=static threading=multi runtime-link=shared --build-type=minimal stage --stagedir=stage/win32

pause

For more details, you can see this article: https://studiofreya.com/2015/12/19/how-to-build-boost-1-60-with-visual-studio-2015/

回答6:

I came to the question via searching for the linker error plus CMAKE, so I'm adding this comment here in case anyone else finds this question the same way.

It turns out that the linker error in my case was due to an errant:

    add_definitions(-DBOOST_ALL_DYN_LINK)

in the CMakeLists.txt, which is fine for Unix, but not Windows in my case. The solution is not use that define on Windows.

回答7:

I needed both versions and used stage target, so I used --stagedir=./stageX86 for x86 version and the default ./stage for x64

回答8:

I also came here from for this linker error plus CMake, but in my case it was the fact that CMake by default will try to build with 32bit by default. This was fixed by specifying -Ax64

cmake -Ax64 {path to CMakeLists.txt}

来源：https://stackoverflow.com/questions/1066071/boost-linker-error-unresolved-external-symbol-class-boostsystemerror-categ