linking to a static 0MQ library in VS

Question

This may be a Visual Studio question more than anything else...
I'm trying to build a 0MQ C++ example using VS10 and ZeroMQ 2.2.0.
I downloaded the windows sources and tried to follow these instructions in order to build 0MQ statically. Specifically:

• Switched to Release
• For all 7 projects in the solution:
  • set General\Configuration Type to Static library (.lib)
  • set C/C++\Code Generation\Runtime Library to Multi-threaded (/MT)
  • added ZMQ_STATIC to C/C++\Preprocessor\Preprocessor Definitions
• Updated zmq.h and zmq_utils.h so that if _MSC_VER and ZMQ_STATIC are defined then DLL_EXPORT will also be defined

At this point 0MQ seems to build well.

• Created an empty console project:
  • switched to Release
  • added a single cpp file with the example linked above
    • changed random to rand, srandom to srand and snprintf to _snprintf
  • set C/C++\Code Generation\Runtime Library to Multi-threaded (/MT)
  • added ...\zeromq-2.2.0\include folder to C/C++\General\Additional Include Directories
  • added ...\zeromq-2.2.0\builds\msvc\Release\*.lib to Linker\Input\Additional Dependencies

However I still receive the following linking errors:

1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_bind
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_close
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_errno
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_init
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_data
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_strerror
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_socket
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_init_size
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_term
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_close
1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_send

What have I missed?

Answer 1

I had similar errors - not when trying to statically link, but just trying to create a ZMQ project and link the .lib 'stubs' for the dll.

In my case it was because I was trying to link the 64-bit libraries into a 32-bit project. I had downloaded the wrong version. When I got the right ones, ie x86 instead of x64, it worked.